CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Main Body ECU)

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U1002 The main body ECU (multiplex network body ECU) cannot receive signals from all ECUs that have been memorized as those connected to sub bus 1.

  • Open or short in sub bus 1 main line or connector

  • Open or short in sub bus 1 branch line or connector

  • Main body ECU (Multiplex network body ECU)

  • Front power seat switch LH*1

  • Front power seat switch RH*1

  • Outer mirror control ECU assembly (for driver side)*1

  • Outer mirror control ECU assembly (for front passenger side)*1

  • Multiplex tilt and telescopic ECU*2

  • Luggage closer motor assembly*3

  • Open or short in CAN junction connector LH2

  • Open or short in CAN junction connector RH2

  • Open or short in CAN No. 1 junction connector

Tech Tips

This diagnosis procedure is for when DTC U1002 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

WIRING DIAGRAM

A01G5ZQE03
A01G9JUE04
A01G642E01
A01G7DVE02

INSPECTION PROCEDURE

Note


  • Before measuring the resistance of the CAN bus, turn the engine switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 10 seconds or more.

  • After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

Tech Tips


  • Operating the engine switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

  • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.

PROCEDURE


  1. CHECK VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    B

    CHECK SUB BUS 1 Click here

    A

  2. CHECK SUB BUS 1


    1. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Disconnect the cable from the negative (-) battery terminal.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus lines

      70 Ω or higher:

      Open circuit in a main bus line
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus line B
      Short circuit between bus lines C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    A

  3. RECONFIRM DTC OUTPUT


    1. Reconnect the cable to the negative (-) battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTCs.

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG) and recheck for DTCs.

      Result
      Result Proceed to

      U1002 is output from main body ECU (multiplex network body ECU)

      (GTS display: Main Body)

      		 A
      Other DTC is output B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  4. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H136 wire harness connector.

    2. A01G6SGE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

  5. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2)


    1. Reconnect the H136 wire harness connector.

    2. A01G8F1E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to CAN Junction Connector RH2

      Disconnect the H142 wire harness connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H142-1 (CANH) - H142-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2) Click here

    OK

    REPLACE CAN JUNCTION CONNECTOR LH2

  6. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2)


    1. Reconnect the H142 wire harness connector.

    2. A01G6S6E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector RH2)
      *b to CAN Junction Connector LH2

      Disconnect the H143 wire harness connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H143-1 (CANH) - H143-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2)

    OK

  7. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN J/C RH2)


    1. Reconnect the H143 wire harness connector.

    2. A01G5ASE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector RH2)
      *b to CAN No. 1 Junction Connector

      Disconnect the H144 wire harness connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H144-1 (CANH) - H144-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 1 J/C) Click here

    OK

    REPLACE CAN JUNCTION CONNECTOR RH2

  8. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 1 J/C)


    1. Reconnect the H144 wire harness connector.

    2. A01G926E42
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to CAN Junction Connector RH2

      Disconnect the H145 CAN No. 1 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H145-3 (CANH) - H145-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 1 J/C)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  9. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Reconnect the H136 wire harness connector.

    2. A01G8JME08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the H9 main body ECU (multiplex network body ECU) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H9-9 (CANP) - H9-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  10. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H136 wire harness connector.

    2. A01G6SGE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

  11. CHECK FOR SHORT IN SUB BUS 1 LINES (BRANCH LINE)


    1. Reconnect the H136 wire harness connector.

    2. A01G7NME01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the main body ECU main line harness connector.

    3. While observing the resistance value shown on the tester, disconnect connectors (H135, H137, H138, H139, H140 and H141) from the CAN junction connector LH2 or CAN junction connector RH2 one by one until the resistance becomes normal (between 54 and 69 Ω).

      A01G5WPE03
      Text in Illustration
      *A w/ Seat Position Memory System *B w/ Power Trunk Lid System
      *C w/ Power Tilt and Power Telescopic Steering Column System - -
      *1 Main Body ECU (Multiplex Network Body ECU) *2 Front Power Seat Switch LH
      *3 Outer Mirror Control ECU Assembly (for Driver Side) *4 Multiplex Tilt and Telescopic ECU
      *5 Luggage Closer Motor Assembly *6 CAN Junction Connector LH2
      *7 Outer Mirror Control ECU Assembly (for Front Passenger Side) *8 Front Power Seat Switch RH
      *9 CAN No. 1 Junction Connector *10 CAN Junction Connector RH2
      A01G5KME01
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector LH2)

      		 - -
      Wiring Color
      CAN Junction Connector LH2 Side Code Color (CANH Side) Color (CANL Side)
      Luggage closer motor assembly*2 H135 V GR
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN junction connector RH2) H142 B GR
      Outer mirror control ECU assembly (for driver side)*1 H138 G GR
      Front power seat switch LH*1 H140 R GR
      Main body ECU (Multiplex network body ECU) H136 Y GR
      Multiplex tilt and telescopic ECU*3 H137 L GR

      • *1: w/ Seat position memory system

      • *2: w/ Power trunk lid system

      • *3: w/ Power tilt and power telescopic steering column system

      A01G7L5E01
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector RH2)

      		 - -
      Wiring Color
      CAN Junction Connector RH2 Side Code Color (CANH Side) Color (CANL Side)
      Outer mirror control ECU assembly (for front passenger side)* H139 R GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN No. 1 junction connector) H144 L GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN junction connector LH2) H143 B GR
      Front power seat switch RH* H141 G GR

      • *: w/ Seat position memory system

      Note

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch lines.

      Result
      Symptom Proceed to
      The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts between a pair of branch lines.) A
      The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short between one or more pairs of branch lines.) B

    4. When there is a short in one or more of the branch lines:


      1. Reconnect all of the connectors to the CAN junction connectors, except for the one that was disconnected last (the short-circuited bus line). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch line only.

        Tech Tips


        • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

        • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


    B

    CHECK FOR SHORT IN SUB BUS 1 LINES (ECU, SENSOR) Click here

    A

  12. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2)


    1. Disconnect the H142 wire harness connector.

    2. A01G7NME01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPLACE CAN JUNCTION CONNECTOR LH2

    OK

  13. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2)


    1. Reconnect the H142 wire harness connector.

    2. Disconnect the H143 wire harness connector.

    3. A01G7NME01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2)

    OK

  14. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C RH2)


    1. Reconnect the H143 wire harness connector.

    2. Disconnect the H144 wire harness connector.

    3. A01G7NME01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPLACE CAN JUNCTION CONNECTOR RH2

    OK

  15. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 1 J/C)


    1. Reconnect the H144 wire harness connector.

    2. Disconnect the H145 CAN No. 1 junction connector.

    3. A01G7NME01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 1 J/C)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  16. CHECK FOR SHORT IN SUB BUS 1 LINES (ECU, SENSOR)


    1. Reconnect the connector for the short-circuited branch line to the CAN junction connector (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch line is connected Click here.

    3. A01G7NME01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Tech Tips

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  17. CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Reconnect the H136 wire harness connector.

    2. A01G8JME08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the H9 main body ECU (multiplex network body ECU) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H9-9 (CANP) - H9-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  18. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H136 wire harness connector.

    2. A01G5FBE01
      Text in Illustration
      *1 DLC3
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

  19. CHECK FOR SHORT IN SUB BUS 1 LINE (BRANCH LINE)


    1. Reconnect the H136 wire harness connector.

    2. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the wire harness connector (H136) and CG or BAT of the DLC3.

      Tech Tips

      It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

    3. While observing the resistance value shown on the ohmmeter, disconnect branch line connectors (H135, H137, H138, H139, H140 and H141) from the CAN junction connector LH2 or CAN junction connector RH2 until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).

      A01G5WPE03
      Text in Illustration
      *A w/ Seat Position Memory System *B w/ Power Trunk Lid System
      *C w/ Power Tilt and Power Telescopic Steering Column System - -
      *1 Main Body ECU (Multiplex Network Body ECU) *2 Front Power Seat Switch LH
      *3 Outer Mirror Control ECU Assembly (for Driver Side) *4 Multiplex Tilt and Telescopic ECU
      *5 Luggage Closer Motor Assembly *6 CAN Junction Connector LH2
      *7 Outer Mirror Control ECU Assembly (for Front Passenger Side) *8 Front Power Seat Switch RH
      *9 CAN No. 1 Junction Connector *10 CAN Junction Connector RH2
      A01G5KME01
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector LH2)

      		 - -
      Wiring Color
      CAN Junction Connector LH2 Side Code Color (CANH Side) Color (CANL Side)
      Luggage closer motor assembly*2 H135 V GR
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN junction connector RH2) H142 B GR
      Outer mirror control ECU assembly (for driver side)*1 H138 G GR
      Front power seat switch LH*1 H140 R GR
      Main body ECU (multiplex network Body ECU) H136 Y GR
      Multiplex tilt and telescopic ECU*3 H137 L GR

      • *1: w/ Seat position memory system

      • *2: w/ Power trunk lid system

      • *3: w/ Power tilt and power telescopic steering column system

      A01G7L5E01
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector RH2)

      		 - -
      Wiring Color
      CAN Junction Connector RH2 Side Code Color (CANH Side) Color (CANL Side)
      Outer mirror control ECU assembly (for front passenger side)* H139 R GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN No. 1 junction connector) H144 L GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN junction connector LH2) H143 B GR
      Front power seat switch RH* H141 G GR

      • *: w/ Seat position memory system

      Result
      Result Proceed to

      The resistance between terminals CANP and BAT, or the resistance between terminals CANN and BAT is still below 6 kΩ when all the specified connectors are disconnected from the CAN junction connector.

      (There is no short to +B in the branch lines.)

      		 A

      The resistance between terminals CANP and GND, or the resistance between terminals CANN and GND is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector.

      (There is no short to GND in the branch lines.)

      The resistance between terminals CANP and BAT, or the resistance between terminals CANN and BAT becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector.

      (There is a short to +B in one of the areas related to one or more of the disconnected branch lines.)

      		 B

      The resistance between terminals CANP and GND, or the resistance between terminals CANN and GND becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector.

      (There is a short to GND in one of the areas related to one or more of the disconnected branch lines.)

    B

    CHECK FOR SHORT IN SUB BUS 1 LINE (ECU, SENSOR) Click here

    A

  20. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2)


    1. Disconnect the H142 wire harness connector.

    2. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPLACE CAN JUNCTION CONNECTOR LH2

    OK

  21. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - CAN J/C RH2)


    1. Reconnect the H142 wire harness connector.

    2. Disconnect the H143 wire harness connector.

    3. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2)

    OK

  22. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C RH2)


    1. Reconnect the H143 wire harness connector.

    2. Disconnect the H144 wire harness connector.

    3. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPLACE CAN JUNCTION CONNECTOR RH2

    OK

  23. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 1 J/C)


    1. Reconnect the H144 wire harness connector.

    2. Disconnect the H145 CAN No. 1 junction connector.

    3. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 1 J/C)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  24. CHECK FOR SHORT IN SUB BUS 1 LINE (ECU, SENSOR)


    1. Reconnect the connector for the bus line that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus line resistance to change to 6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to +B or GND is connected Click here.

    3. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • If the resistance becomes normal when the connector is disconnected from the ECU, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  25. CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H9 main body ECU (multiplex network body ECU) connector.

    2. A01G4RPE01
      Text in Illustration
      *1 DLC3
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  26. CHECK SUB BUS 1


    1. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Disconnect the cable from the negative (-) battery terminal.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus lines

      70 Ω or higher:

      Open circuit in a main bus line
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus line B
      Short circuit between bus lines C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    A

  27. RECONFIRM DTC OUTPUT


    1. Reconnect the cable to the negative (-) battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTCs.

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG) and recheck for DTCs.

      Result
      Result Proceed to

      U1002 is output from main body ECU (multiplex network body ECU)

      (GTS display: Main Body)

      		 A
      Other DTC is output B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  28. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H136 wire harness connector.

    2. A01G8UWE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

  29. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2)


    1. Reconnect the H136 wire harness connector.

    2. A01G6S6E03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to CAN Junction Connector RH2

      Disconnect the H142 wire harness connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H142-1 (CANH) - H142-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2) Click here

    OK

    REPLACE CAN JUNCTION CONNECTOR LH2

  30. CHECK FOR OPEN IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2)


    1. Reconnect the H142 wire harness connector.

    2. A01G8F1E04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector RH2)
      *b to CAN Junction Connector LH2

      Disconnect the H143 wire harness connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H143-1 (CANH) - H143-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2)

    OK

  31. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN J/C RH2)


    1. Reconnect the H143 wire harness connector.

    2. A01G455E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector RH2)
      *b to CAN No. 1 Junction Connector

      Disconnect the H144 wire harness connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H144-1 (CANH) - H144-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 1 J/C) Click here

    OK

    REPLACE CAN JUNCTION CONNECTOR RH2

  32. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 1 J/C)


    1. Reconnect the H144 wire harness connector.

    2. A01G926E42
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to CAN Junction Connector RH2

      Disconnect the H145 CAN No. 1 junction connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H145-3 (CANH) - H145-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 1 J/C)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  33. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Reconnect the H136 wire harness connector.

    2. A01G8JME08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the H9 main body ECU (multiplex network body ECU) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H9-9 (CANP) - H9-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  34. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H136 wire harness connector.

    2. A01G8UWE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

  35. CHECK FOR SHORT IN SUB BUS 1 LINES (BRANCH LINE)


    1. Reconnect the H136 wire harness connector.

    2. A01G7YEE01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the main body ECU main line harness connector.

    3. While observing the resistance value shown on the tester, disconnect connectors (H135, H137, H138, H139, H140 and H141) from the CAN junction connector LH2 or CAN junction connector RH2 one by one until the resistance becomes normal (between 54 and 69 Ω).

      A01G6MTE01
      Text in Illustration
      *A w/ Seat Position Memory System (for front passenger side) *B w/ Power Tilt and Power Telescopic Steering Column System
      *C w/ Power Trunk Lid System - -
      *1 CAN No. 1 Junction Connector *2 Front Power Seat Switch RH
      *3 Outer Mirror Control ECU Assembly (for Driver Side) *4 Multiplex Tilt and Telescopic ECU
      *5 Luggage Closer Motor Assembly *6 CAN Junction Connector RH2
      *7 Front Power Seat Switch LH *8 Outer Mirror Control ECU Assembly (for Front Passenger Side)
      *9 Main Body ECU (Multiplex Network Body ECU) *10 CAN Junction Connector LH2
      A01G7L5E02
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector LH2)

      		 - -
      Wiring Color
      CAN Junction Connector LH2 Side Code Color (CANH Side) Color (CANL Side)
      Main body ECU (multiplex network body ECU) H136 Y GR
      Outer mirror control ECU assembly (for front passenger side) H138 G GR
      Front power seat switch LH* H140 R GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN junction connector LH2) H142 B GR

      • *: w/ Seat position memory system

      A01G5KME02
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector RH2)

      		 - -
      Wiring Color
      CAN Junction Connector RH2 Side Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN junction connector RH2) H143 B GR
      Outer mirror control ECU assembly (for driver side) H139 R GR
      Front power seat switch RH H141 G GR
      Multiplex tilt and telescopic ECU*1 H137 L GR
      Luggage closer motor assembly*2 H135 V GR
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN No. 1 junction connector) H144 L GR

      • *1: w/ Power tilt and power telescopic steering column system

      • *2: w/ Power trunk lid system

      Note

      Do not reconnect the disconnected connectors until this inspection is complete because there may be a short in 2 or more branch lines.

      Result
      Symptom Proceed to
      The resistance is still below 54 Ω when all the specified connectors are disconnected. (There are no shorts between a pair of branch lines.) A
      The resistance becomes normal (between 54 and 69 Ω) when a connector is disconnected. (There is a short between one or more pairs of branch lines.) B

    4. When there is a short in one or more of the branch lines:


      1. Reconnect all of the connectors to the CAN junction connectors, except for the one that was disconnected last (the short-circuited bus line). Check that the resistance shown on the tester is normal (between 54 and 69 Ω) to confirm that there is a short in the one branch line only.

        Tech Tips


        • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines.

        • Reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.


    B

    CHECK FOR SHORT IN SUB BUS 1 LINES (ECU, SENSOR) Click here

    A

  36. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2)


    1. Disconnect the H142 wire harness connector.

    2. A01G7YEE01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPLACE CAN JUNCTION CONNECTOR LH2

    OK

  37. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C LH2 - CAN J/C RH2)


    1. Reconnect the H142 wire harness connector.

    2. Disconnect the H143 wire harness connector.

    3. A01G7YEE01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2)

    OK

  38. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN J/C RH2)


    1. Reconnect the H143 wire harness connector.

    2. Disconnect the H144 wire harness connector.

    3. A01G7YEE01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.


    NG

    REPLACE CAN JUNCTION CONNECTOR RH2

    OK

  39. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 1 J/C)


    1. Reconnect the H144 wire harness connector.

    2. Disconnect the H145 CAN No. 1 junction connector.

    3. A01G7YEE01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 1 J/C)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  40. CHECK FOR SHORT IN SUB BUS 1 LINES (ECU, SENSOR)


    1. Reconnect the connector for the short-circuited branch line to the CAN junction connector (the connector that caused the bus line resistance to become normal (between 54 and 69 Ω) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the short-circuited branch line is connected Click here.

    3. A01G7YEE01
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H136-1 (CANH) - H136-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Tech Tips

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  41. CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Reconnect the H136 wire harness connector.

    2. A01G8JME08
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the H9 main body ECU (multiplex network body ECU) connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H9-9 (CANP) - H9-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  42. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H136 wire harness connector.

    2. A01G9L2E01
      Text in Illustration
      *1 DLC3
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)
      *b to Main Body ECU (Multiplex Network Body ECU)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    OK

  43. CHECK FOR SHORT IN SUB BUS 1 LINE (BRANCH LINE)


    1. Reconnect the H136 wire harness connector.

    2. A01G4RPE05
      Text in Illustration
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the wire harness connector (H136) and CG or BAT of the DLC3.

      Tech Tips

      It is only necessary to perform the inspection for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

    3. While observing the resistance value shown on the ohmmeter, disconnect branch line connectors (H135, H137, H138, H139, H140 and H141) from the CAN junction connector LH2 or CAN junction connector RH2 until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).

      A01G6MTE01
      Text in Illustration
      *A w/ Seat Position Memory System (for front passenger side) *B w/ Power Tilt and Power Telescopic Steering Column System
      *C w/ Power Trunk Lid System - -
      *1 CAN No. 1 Junction Connector *2 Front Power Seat Switch RH
      *3 Outer Mirror Control ECU Assembly (for Driver Side) *4 Multiplex Tilt and Telescopic ECU
      *5 Luggage Closer Motor Assembly *6 CAN Junction Connector RH2
      *7 Front Power Seat Switch LH *8 Outer Mirror Control ECU Assembly (for Front Passenger Side)
      *9 Main Body ECU (Multiplex Network Body ECU) *10 CAN Junction Connector LH2
      A01G7L5E02
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector LH2)

      		 - -
      Wiring Color
      CAN Junction Connector LH2 Side Code Color (CANH Side) Color (CANL Side)
      Main body ECU (Multiplex network body ECU) H136 Y GR
      Outer mirror control ECU assembly (for front passenger side) H138 G GR
      Front power seat switch LH* H140 V GR
      CAN main bus line (bus line connecting CAN junction connector RH2 and CAN junction connector LH2) H142 L GR

      • *: w/ Seat position memory system

      A01G5KME02
      Text in Illustration
      *a

      Component without harness connected

      (CAN Junction Connector RH2)

      		 - -
      Wiring Color
      CAN Junction Connector RH2 Side Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN junction connector RH2) H143 B GR
      Outer mirror control ECU assembly (for driver side) H139 R GR
      Front power seat switch RH H141 G GR
      Multiplex tilt and telescopic ECU*1 H137 L GR
      Luggage closer motor assembly*2 H135 Y GR
      CAN main bus line (bus line connecting CAN junction connector LH2 and CAN No. 1 junction connector) H144 V GR

      • *1: w/ Power tilt and power telescopic steering column system

      • *2: w/ Power trunk lid system

      Result
      Result Proceed to

      The resistance between terminals CANP and BAT, or the resistance between terminals CANN and BAT is still below 6 kΩ when all the specified connectors are disconnected from the CAN junction connector.

      (There is no short to +B in the branch lines.)

      		 A

      The resistance between terminals CANP and GND, or the resistance between terminals CANN and GND is still below 200 Ω when all the specified connectors are disconnected from the CAN junction connector.

      (There is no short to GND in the branch lines.)

      The resistance between terminals CANP and BAT, or the resistance between terminals CANN and BAT becomes normal (6 kΩ or higher) when a connector is disconnected from the CAN junction connector.

      (There is a short to +B in one of the areas related to one or more of the disconnected branch lines.)

      		 B

      The resistance between terminals CANP and GND, or the resistance between terminals CANN and GND becomes normal (200 Ω or higher) when a connector is disconnected from the CAN junction connector.

      (There is a short to GND in one of the areas related to one or more of the disconnected branch lines.)

    B

    CHECK FOR SHORT IN SUB BUS 1 LINE (ECU, SENSOR) Click here

    A

  44. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2)


    1. Disconnect the H142 wire harness connector.

    2. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPLACE CAN JUNCTION CONNECTOR LH2

    OK

  45. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C LH2 - CAN J/C RH2)


    1. Reconnect the H142 wire harness connector.

    2. Disconnect the H143 wire harness connector.

    3. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - CAN J/C RH2)

    OK

  46. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN J/C RH2)


    1. Reconnect the H143 wire harness connector.

    2. Disconnect the H144 wire harness connector.

    3. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Note


      • Before disconnecting the connector, make a note of where it is connected.

      • Reconnect the connector to its original position.

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPLACE CAN JUNCTION CONNECTOR RH2

    OK

  47. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 1 J/C)


    1. Reconnect the H144 wire harness connector.

    2. Disconnect the H145 CAN No. 1 junction connector.

    3. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C RH2 - CAN NO. 1 J/C)

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  48. CHECK FOR SHORT IN SUB BUS 1 LINE (ECU, SENSOR)


    1. Reconnect the connector for the bus line that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus line resistance to change to 6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short) when it was disconnected).

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU to which the bus line shorted to +B or GND is connected Click here.

    3. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Component with harness connected

      (CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • If the resistance becomes normal when the connector is disconnected from the ECU, there may be a short in the ECU.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

  49. CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the H9 main body ECU (multiplex network body ECU) connector.

    2. A01G8Z1E01
      Text in Illustration
      *1 DLC3
      *a

      Rear view of wire harness connector

      (to CAN Junction Connector LH2)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H136-1 (CANH) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H136-2 (CANL) - H29-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H136-1 (CANH) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H136-2 (CANL) - H29-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Specified Condition column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN J/C LH2 - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here