CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

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

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area Note
U1002 Lost Communication with Gateway Module (Main Body ECU) 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 lines or connector

  • Short in sub bus 1 branch lines or connector

  • Main body ECU (multiplex network body ECU)

  • Outer mirror control ECU assembly (for driver side) (w/ Seat Position Memory System)

  • Outer mirror control ECU assembly (for front passenger side) (w/ Seat Position Memory System)

  • Position control ECU and switch assembly LH (w/ Seat Position Memory System)

  • Position control ECU and switch assembly RH (w/ Seat Position Memory System)

  • Multiplex tilt and telescopic ECU

  • Multiplex network door ECU (w/ Power Back Door System)

  • Open or short in No. 8 CAN junction connector

  • Open or short in No. 11 CAN junction connector

  • Open or short in No. 1 CAN junction terminal

Tech Tips

The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

Tech Tips

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

WIRING DIAGRAM

B005MNEE03

CAUTION / NOTICE / HINT

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 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 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 for at least 20 seconds.

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

    Click here

  • Before replacing the main body ECU (multiplex network body ECU), 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.

PROCEDURE


  1. CHECK SUB BUS 1


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

    2. B005PAKC28
      *1 DLC3
      *a

      Component with harness connected

      (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
      J9-9 (CANP) - J9-10 (CANN) 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
      J9-9 (CANP) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      J9-10 (CANN) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      J9-9 (CANP) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      J9-10 (CANN) - J12-16 (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 lines B
      Short circuit between bus lines C

      • Short to ground

      • +B short

      		 D

    B

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

    C

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

    D

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

    A

  2. CHECK FOR 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.


      Body Electrical > Main Body > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG).

    8. Check for DTCs.


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

    A

    SYMPTOM SIMULATION Click here

    B

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

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


    1. B005LWMC52
      *a

      Front view of wire harness connector

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

      Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J9-9 (CANP) - J9-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

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

    NG

  4. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the J9 main body ECU (multiplex network body ECU) connector.

    2. B005OKIC65
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

      Disconnect the R39 No. 1 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R39-3 (CANH) - R39-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  5. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 11 CAN JUNCTION CONNECTOR)


    1. Reconnect the R39 No. 1 CAN junction terminal connector.

    2. B005O44C14
      *a

      Front view of wire harness connector

      (to No. 11 CAN Junction Connector)
      *b to No. 8 CAN Junction Connector
      *c to Main Body ECU (Multiplex Network Body ECU)

      Disconnect the S62 No. 11 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      S62-1 (CANH) - S62-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 8 CAN junction connector
      S62-3 (CANH) - S62-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      Result
      Result Proceed to
      OK A
      NG (Main body ECU (multiplex network body ECU) main lines) B
      NG (No. 8 CAN junction connector main lines) C

    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

  6. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 8 CAN JUNCTION CONNECTOR)


    1. Reconnect the S62 No. 11 CAN junction connector.

    2. B005O44C15
      *a

      Front view of wire harness connector

      (to No. 8 CAN Junction Connector)
      *b to No. 11 CAN Junction Connector
      *c to No. 1 CAN Junction Terminal

      Disconnect the R38 No. 8 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R38-7 (CANH) - R38-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector
      R38-9 (CANH) - R38-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN Junction Terminal
      Result
      Result Proceed to
      OK A
      NG (No. 1 CAN junction terminal main lines) B
      NG (No. 11 CAN junction connector main lines) C

    A

    REPLACE NO. 8 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 11 CAN JUNCTION CONNECTOR)

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


    1. B005LWMC53
      *a

      Front view of wire harness connector

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

      Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J9-9 (CANP) - J9-10 (CANN) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

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

    NG

  8. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the J9 main body ECU (multiplex network body ECU) connector.

    2. B005OKIC66
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

      Disconnect the R39 No. 1 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R39-3 (CANH) - R39-2 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  9. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 11 CAN JUNCTION CONNECTOR)


    1. Reconnect the R39 No. 1 CAN junction terminal connector.

    2. B005O44C52
      *a

      Front view of wire harness connector

      (to No. 11 CAN Junction Connector)
      *b to No. 8 CAN Junction Connector
      *c to Multiplex Tilt and Telescopic ECU
      *d to Main Body ECU (Multiplex Network Body ECU)
      *e

      to Position Control ECU and Switch Assembly LH

      (w/ Seat Position Memory System)
      *f

      to Multiplex Network Door ECU

      (w/ Power Back Door System)
      *g

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (for LHD w/ Seat Position Memory System)
      *h

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (for RHD w/ Seat Position Memory System)

      Disconnect the S62 No. 11 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      S62-1 (CANH) - S62-12 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 8 CAN junction connector
      S62-2 (CANH) - S62-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU
      S62-3 (CANH) - S62-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      S62-4 (CANH) - S62-15 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU and switch assembly LH*1
      S62-5 (CANH) - S62-16 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Multiplex network door ECU*2
      S62-6 (CANH) - S62-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Outer mirror control ECU assembly (for driver side)*3

      Outer mirror control ECU assembly (for front passenger side)*4
      *1: w/ Seat Position Memory System
      *2: w/ Power Back Door System
      *3: for LHD w/ Seat Position Memory System
      *4: for RHD w/ Seat Position Memory System
      Result
      Result Proceed to
      OK A
      NG (Main body ECU (multiplex network body ECU) main lines) B
      NG (ECU or sensor branch lines) C
      NG (No. 8 CAN junction connector main lines) D

    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

    GO TO STEP 11 Click here

    D

  10. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 8 CAN JUNCTION CONNECTOR)


    1. Reconnect the S62 No. 11 CAN junction connector.

    2. B005O44C40
      *a

      Front view of wire harness connector

      (to No. 8 CAN Junction Connector)
      *b to No. 11 CAN Junction Connector
      *c

      to Position Control ECU and Switch Assembly RH

      (w/ Seat Position Memory System)
      *d to No. 1 CAN Junction Terminal
      *e

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (for LHD w/ Seat Position Memory System)
      *f

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (for RHD w/ Seat Position Memory System)

      Disconnect the R38 No. 8 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      R38-7 (CANH) - R38-18 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 11 CAN junction connector
      R38-8 (CANH) - R38-19 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Position control ECU and switch assembly RH*1
      R38-9 (CANH) - R38-20 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 1 CAN junction terminal
      R38-10 (CANH) - R38-21 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher

      Outer Mirror Control ECU Assembly (for Front Passenger Side)*2

      Outer Mirror Control ECU Assembly (for Driver Side)*3
      *1: w/ Seat Position Memory System
      *2: for LHD w/ Seat Position Memory System
      *3: for RHD w/ Seat Position Memory System
      Result
      Result Proceed to
      OK A
      NG (No. 1 CAN junction terminal main lines) B
      NG (ECU or sensor branch lines) C
      NG (No. 11 CAN junction connector main lines) D

    A

    REPLACE NO. 8 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

    D

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 11 CAN JUNCTION CONNECTOR)

    C

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


    1. Reconnect all wire harness connectors.

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

      Click here

    3. B005L5SC15
      *a

      Component with harness connected

      (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
      J9-9 (CANP) - J9-10 (CANN) 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 or sensor, there may be a short in the ECU or sensor.

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

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


    1. B005P3IC18
      *1 DLC3
      *a

      Front view of wire harness connector

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

      Disconnect the J9 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      J9-9 (CANP) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      J9-10 (CANN) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      J9-9 (CANP) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      J9-10 (CANN) - J12-16 (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 Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

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

    NG

  13. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the J9 main body ECU (multiplex network body ECU) connector.

    2. B005PONC32
      *1 DLC3
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

      Disconnect the R39 No. 1 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      R39-3 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      R39-2 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      R39-3 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      R39-2 (CANL) - J12-16 (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 Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  14. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 11 CAN JUNCTION CONNECTOR)


    1. Reconnect the R39 No. 1 CAN junction terminal connector.

    2. Disconnect the S62 No. 11 CAN junction connector.

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

      B005NLLC98
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 11 CAN Junction Connector)

      		 *b to No. 8 CAN Junction Connector
      *c to Multiplex Tilt and Telescopic ECU *d to Main Body ECU (Multiplex Network Body ECU)
      *e

      to Position Control ECU and Switch Assembly LH

      (w/ Seat Position Memory System)

      		 *f

      to Multiplex Network Door ECU

      (w/ Power Back Door System)
      *g

      to Outer Mirror Control ECU Assembly (for Driver Side)

      (for LHD w/ Seat Position Memory System)

      		 *h

      to Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (for RHD w/ Seat Position Memory System)
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      S62-1 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 8 CAN junction connector
      S62-12 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      S62-2 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Multiplex tilt and telescopic ECU
      S62-13 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      S62-3 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Main body ECU (Multiplex network body ECU)
      S62-14 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      S62-4 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Position control ECU and switch assembly LH*1
      S62-15 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      S62-5 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Multiplex network door ECU*2
      S62-16 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      S62-6 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground

      Outer mirror control ECU assembly (for driver side)*3

      Outer mirror control ECU assembly (for front passenger side)*4
      S62-17 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      S62-1 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 8 CAN junction connector
      S62-12 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      S62-2 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Multiplex tilt and telescopic ECU
      S62-13 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      S62-3 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Main body ECU (Multiplex network body ECU)
      S62-14 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      S62-4 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly LH*1
      S62-15 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      S62-5 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Multiplex network door ECU*2
      S62-16 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      S62-6 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short

      Outer mirror control ECU assembly (for driver side)*3

      Outer mirror control ECU assembly (for front passenger side)*4
      S62-17 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      *1: w/ Seat Position Memory System
      *2: w/ Power Back Door System
      *3: for LHD w/ Seat Position Memory System
      *4: for RHD w/ Seat Position Memory System

      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.

      Result
      Result Proceed to
      OK A
      NG (Main body ECU (multiplex network body ECU) main line) B
      NG (ECU or sensor branch line) C
      NG (No. 8 CAN junction connector main line) D

    A

    REPLACE NO. 11 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 11 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

    GO TO STEP 16 Click here

    D

  15. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 8 CAN JUNCTION CONNECTOR)


    1. Reconnect the S62 No. 11 CAN junction connector.

    2. Disconnect the R38 No. 8 CAN junction connector.

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

      B005NLLC99
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 8 CAN Junction Connector)

      		 *b to No. 11 CAN Junction Connector
      *c

      to Position Control ECU and Switch Assembly RH

      (w/ Seat Position Memory System)

      		 *d to No. 1 CAN Junction Terminal
      *e

      Outer Mirror Control ECU Assembly (for Front Passenger Side)

      (for LHD w/ Seat Position Memory System)

      		 *f

      Outer Mirror Control ECU Assembly (for Driver Side)

      (for RHD w/ Seat Position Memory System)
      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      R38-7 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 11 CAN junction connector
      R38-18 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      R38-8 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground Position control ECU and switch assembly RH*1
      R38-19 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      R38-9 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground No. 1 CAN junction terminal
      R38-20 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      R38-10 (CANH) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground

      Outer mirror control ECU assembly (for front passenger side)*2

      Outer mirror control ECU assembly (for driver side)*3
      R38-21 (CANL) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      R38-7 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 11 CAN junction connector
      R38-18 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      R38-8 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly RH*1
      R38-19 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      R38-9 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 1 CAN junction terminal
      R38-20 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      R38-10 (CANH) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short

      Outer mirror control ECU assembly (for front passenger side)*2

      Outer mirror control ECU assembly (for driver side)*3
      R38-21 (CANL) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      *1: w/ Seat Position Memory System
      *2: for LHD w/ Seat Position Memory System
      *3: for RHD w/ Seat Position Memory System

      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.

      Result
      Result Proceed to
      OK A
      NG (No. 1 CAN junction terminal main line) B
      NG (ECU or sensor branch lines) C
      NG (No. 11 CAN junction connector main line) D

    A

    REPLACE NO. 8 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

    D

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 8 CAN JUNCTION CONNECTOR - NO. 11 CAN JUNCTION CONNECTOR)

    C

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


    1. Reconnect all wire harness connectors.

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

      Click here

    3. B005PAKC31
      *1 DLC3
      *a

      Component with harness connected

      (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
      J9-9 (CANP) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      J9-10 (CANN) - J12-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      J9-9 (CANP) - J12-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      J9-10 (CANN) - J12-16 (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 or sensor, there may be a short in the ECU or sensor.

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

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR