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 Main body ECU (multiplex network body ECU) does not 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

  • Short in Sub bus 1 branch line or connector

  • Main body ECU (Multiplex network body ECU)

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

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

  • Position control ECU and switch assembly (for Driver side)*1

  • Multiplex tilt and telescopic ECU*2

  • Open or short in CAN No. 3 junction connector

  • Open or short in CAN No. 4 junction connector

  • Open or short in CAN No. 5 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

B000LVFE02

INSPECTION PROCEDURE

Note


  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any 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 ignition 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 ignition switch to ON and wait at least 10 seconds.

  • 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.

Tech Tips


  • Operating the ignition 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 wire harnesses, and to make future maintenance easier.

PROCEDURE


  1. CHECK SUB BUS 1


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

      B000N8KE01

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I114-2 (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 main bus lines
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -
      Result
      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus lines) B
      NG (Short circuit between bus lines) C

      • NG (Ground short)

      • NG (+B short)

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    A

  2. RECONFIRM DTC OUTPUT


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

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Clear the DTCs.

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON and recheck for DTCs.

      Result
      Result Proceed to
      DTC U1002 is not output from main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from main body ECU (multiplex network body ECU) (GTS display: Main Body) B

    B

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

    A

    SYMPTOM SIMULATION Click here

  3. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the wire harness connector (I114) from the CAN No. 3 junction connector.

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

      B000KYRE01
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      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

  4. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 3 J/C)


    1. Reconnect the wire harness connector (I114) to the CAN No. 3 junction connector.

    2. Disconnect the wire harness connector (I117) from the CAN No. 3 junction connector.

      B000MQZE01
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)

      		 *b to CAN No. 4 Junction Connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I117-1 (CANH) - I117-2 (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. 3 J/C - CAN NO. 4 J/C) Click here

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  5. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 3 J/C - CAN NO. 4 J/C)


    1. Reconnect the wire harness connector (I117) to the CAN No. 3 junction connector.

    2. B000LHDE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 4 Junction Connector)
      *b to CAN No. 3 Junction Connector

      Disconnect the wire harness connector (I120) from the CAN No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I120-1 (CANH) - I120-2 (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 NO. 3 J/C - CAN NO. 4 J/C)

    OK

  6. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 4 J/C)


    1. Reconnect the wire harness connector (I120) to the CAN No. 4 junction connector.

    2. B000K8PE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 4 Junction Connector)
      *b to CAN No. 5 Junction Connector

      Disconnect the wire harness connector (I121) from the CAN No. 4 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I121-1 (CANH) - I121-2 (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. 4 J/C - CAN NO. 5 J/C) Click here

    OK

    REPLACE CAN NO. 4 JUNCTION CONNECTOR

  7. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (CAN NO. 4 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector (I121) to the CAN No. 4 junction connector.

    2. B000H3TE63
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to CAN No. 4 Junction Connector

      Disconnect the I123 CAN No. 5 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I123-3 (CANH) - I123-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 4 J/C - CAN NO. 5 J/C)

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

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


    1. Reconnect the wire harness connector (I114) to the CAN No. 3 junction connector.

    2. B000ILQE12
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the I12 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
      I12-9 (CANP) - I12-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

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

  9. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the wire harness connector (I114) from the CAN No. 3 junction connector.

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

      B000KYRE01
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      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

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


    1. Reconnect the wire harness connector (I114) to the CAN No. 3 junction connector.

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

      B000MQSE02
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

    3. While observing the resistance value shown on the tester, disconnect connectors (I115, I199, I200 and I201) from the CAN No. 3 junction connector or CAN No. 4 junction connector one by one until the resistance becomes normal (between 54 and 69 Ω).

      B000M4NE02
      Text in Illustration
      *A w/ Seat Position Memory System *B w/ Power Tilt and Power Telescopic Steering Column System
      *1 Position Control ECU and Switch Assembly (for Driver Side) *2 Main Body ECU (Multiplex Network Body ECU)
      *3 Outer Mirror Control ECU Assembly (for Driver Side) *4 Multiplex Tilt and Telescopic ECU
      *5 Outer Mirror Control ECU Assembly (for Front Passenger Side) *6 CAN No. 5 Junction Connector
      *7 CAN No. 4 Junction Connector *8 CAN No. 3 Junction Connector
      B000ILBE01
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component without harness connected

      (CAN No. 3 Junction Connector)

      		 - -
      Wiring Color:
      CAN No. 3 Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting CAN No. 3 junction connector and main body ECU (multiplex network body ECU)) I114 R GR
      Multiplex tilt and telescopic ECU*1 I115 B GR
      CAN main bus line (bus line connecting CAN No. 3 junction connector and CAN No. 4 junction connector) I117 Y GR
      Outer mirror control ECU assembly (for Driver side)*2 I199 G GR
      Position control ECU and switch assembly (for Driver side)*2 I201 L GR

      • *1: w/ Power Tilt and Power Telescopic Steering Column System

      • *2: w/ Seat Position Memory System

      B000GZPE04
      Text in Illustration
      *a

      Component without harness connected

      (CAN No. 4 Junction Connector)

      		 - -
      Wiring Color:
      CAN No. 4 Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Outer mirror control ECU assembly (for Front passenger side)* I200 P GR
      CAN main bus line (bus line connecting CAN No. 3 junction connector and CAN No. 4 junction connector) I120 Y GR
      CAN main bus line (bus line connecting CAN No. 4 junction connector and CAN No. 5 junction connector) I121 V 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 connector, 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 wire such as tension on the wire harnesses, and to make future maintenance easier.


    B

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

    A

  11. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 3 J/C)


    1. Disconnect the wire harness connector (I117) from the CAN No. 3 junction connector.

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

      B000MQSE02
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      Note


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

      • Reconnect the connector to its original position.


    NG

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

    OK

  12. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 3 J/C - CAN NO. 4 J/C)


    1. Reconnect the wire harness connector (I117) to the CAN No. 3 junction connector.

    2. Disconnect the wire harness connector (I120) from the CAN No. 4 junction connector.

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

      B000MQSE02
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 NO. 3 J/C - CAN NO. 4 J/C)

    OK

  13. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 4 J/C)


    1. Reconnect the wire harness connector (I120) to the CAN No. 4 junction connector.

    2. Disconnect the wire harness connector (I121) from the CAN No. 4 junction connector.

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

      B000MQSE02
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      Note


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

      • Reconnect the connector to its original position.


    NG

    REPLACE CAN NO. 4 JUNCTION CONNECTOR

    OK

  14. CHECK FOR SHORT IN SUB BUS 1 LINES (CAN NO. 4 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector (I121) to the CAN No. 4 junction connector.

    2. Disconnect the I123 CAN No. 5 junction connector.

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

      B000MQSE02
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 4 J/C - CAN NO. 5 J/C)

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

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

      B000MQSE02
      Standard Resistance
      Tester Connection Condition Specified Condition
      I114-1 (CANH) - I114-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 CAN BRANCH LINE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

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


    1. Reconnect the wire harness connector (I114) to the CAN No. 3 junction connector.

    2. B000ILQE13
      Text in Illustration
      *a

      Front view of wire harness connector

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

      Disconnect the I12 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
      I12-9 (CANP) - I12-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

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

  17. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Disconnect the wire harness connector (I114) from the CAN No. 3 junction connector.

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

      B000LN8E01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      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 Result 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

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


    1. Reconnect the wire harness connector (I114) to the CAN No. 3 junction connector.

    2. Connect the probes of an ohmmeter to terminals 1 (CANH) and 2 (CANL) of the wire harness connectors (I114) and CG or BAT of the DLC3.

      B000N8KE01
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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.

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

    3. While observing the resistance value shown on the ohmmeter, disconnect branch line connector (I115, I199, I200 and I201) from the CAN No. 3 junction connector or CAN No. 4 junction connector until the resistance becomes normal (6 kΩ or higher (for +B short) or 200 Ω or higher (for ground short)).

      B000M4NE02
      Text in Illustration
      *A w/ Seat Position Memory System *B w/ Power Tilt and Power Telescopic steering Column System
      *1 Position Control ECU and Switch Assembly (for Driver Side) *2 Main Body ECU (Multiplex Network Body ECU)
      *3 Outer Mirror Control ECU Assembly (for Driver Side) *4 Multiplex Tilt and Telescopic ECU
      *5 Outer Mirror Control ECU Assembly (for Front Passenger Side) *6 CAN No. 5 Junction Connector
      *7 CAN No. 4 Junction Connector *8 CAN No. 3 Junction Connector
      B000ILBE01
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *a

      Component without harness connected

      (CAN No. 3 Junction Connector)

      		 - -
      Wiring Color:
      CAN No. 3 Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      CAN main bus line (bus line connecting CAN No. 3 junction connector and main body ECU (multiplex network body ECU)) I114 R GR
      Multiplex tilt and telescopic ECU*1 I115 B GR
      CAN main bus line (bus line connecting CAN No. 3 junction connector and CAN No. 4 junction connector) I117 Y GR
      Outer mirror control ECU assembly (for Driver side)*2 I199 G GR
      Position control ECU and switch assembly (for Driver side)*2 I201 L GR

      • *1: w/ Power Tilt and Power Telescopic Steering Column System

      • *2: w/ Seat Position Memory System

      B000GZPE04
      Text in Illustration
      *a

      Component without harness connected

      (CAN No. 4 Junction Connector)

      		 - -
      Wiring Color:
      CAN No. 4 Junction Connector Side Code Color (CANH Side) Color (CANL Side)
      Outer mirror control ECU assembly (for Front passenger side)* I200 P GR
      CAN main bus line (bus line connecting CAN No. 3 junction connector and CAN No. 4 junction connector) I120 Y GR
      CAN main bus line (bus line connecting CAN No. 4 junction connector and CAN No. 5 junction connector) I121 V GR

      • *: w/ Seat Position Memory System

      Result
      Result Proceed to

      The resistance between terminals CANH and BAT, or the resistance between terminals CANL 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 CANH and CG, or the resistance between terminals CANL and CG 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 CANH and BAT, or the resistance between terminals CANL 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 CANH and CG, or the resistance between terminals CANL and CG 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

  19. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 3 J/C)


    1. Disconnect the wire harness connector (I117) from the CAN No. 3 junction connector.

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

      B000N8KE01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 Result column from the Check Sub Bus 1 inspection.


    NG

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

    OK

  20. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 3 J/C - CAN NO. 4 J/C)


    1. Reconnect the wire harness connector (I117) to the CAN No. 3 junction connector.

    2. Disconnect the wire harness connector (I120) from the CAN No. 4 junction connector.

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

      B000N8KE01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 Result column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 4 J/C)

    OK

  21. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 4 J/C)


    1. Reconnect the wire harness connector (I120) to the CAN No. 4 junction connector.

    2. Disconnect the wire harness connector (I121) from the CAN No. 4 junction connector.

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

      B000N8KE01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 Result column from the Check Sub Bus 1 inspection.


    NG

    REPLACE CAN NO. 4 JUNCTION CONNECTOR

    OK

  22. CHECK FOR SHORT IN SUB BUS 1 LINE (CAN NO. 4 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector (I121) to the CAN No. 4 junction connector.

    2. Disconnect the I123 CAN No. 5 junction connector.

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

      B000N8KE01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 Result column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 4 J/C - CAN NO. 5 J/C)

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

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

      B000N8KE01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Component with harness connected

      (CAN No. 3 Junction Connector)

      		 - -

      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 CAN BRANCH LINE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

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


    1. Disconnect the I12 main body ECU (multiplex network body ECU) connector.

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

      B000LN8E01
      Standard Resistance
      Tester Connection Condition Specified Condition Result
      I114-1 (CANH) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      I114-2 (CANL) - I39-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      I114-1 (CANH) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      I114-2 (CANL) - I39-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Text in Illustration
      *A for TMC Made *B for TMMR Made
      *1 DLC3 - -
      *a

      Rear view of wire harness connector

      (to CAN No. 3 Junction Connector)

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

      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 Result column from the Check Sub Bus 1 inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    OK

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