CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

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

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U1002 Main body ECU cannot receive signals from all ECUs that have been memorized as those connected to the CAN MS bus.

  • Open or short in CAN MS bus main wire or connector

  • Open or short in CAN MS bus branch wire or connector

  • Main body ECU

  • Outer mirror control ECU RH

  • Outer mirror control ECU LH

  • Front power seat switch RH

  • Front power seat switch LH

  • Power back door ECU

  • Tilt and telescopic ECU

  • Tire pressure warning ECU and receiver

  • CAN No. 6 junction connector

  • CAN No. 7 junction connector

  • CAN No. 8 junction connector

WIRING DIAGRAM

A01NKSFE01
A01NKQ0E01

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN bus main wires and between CAN bus branch wires.

  • Turn the power switch off before inspecting CAN bus wires for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • Operating the power 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 MS BUS


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

    2. A01NLBCE04
      Text in Illustration
      *1

      Component with harness connected

      (Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      F36-5 (CANP) - F36-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus wires

      70 Ω or more:

      Open circuit in a main bus wire
      F36-5 (CANP) - F36-11 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      F36-14 (CANN) - F36-11 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher

      Below 200 Ω:

      CANL ground short

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      F36-5 (CANP) - F36-2 (+B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      F36-14 (CANN) - F36-2 (+B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

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

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN MS BUS MAIN LINES (TILT AND TELESCOPIC ECU) Click here

    C

    CHECK FOR SHORT IN MS BUS LINES (TILT AND TELESCOPIC ECU) Click here

    D

    CHECK FOR SHORT IN MS BUS LINES (TILT AND TELESCOPIC ECU) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Connect the intelligent tester to the DLC3.

    2. Turn the power switch on (IG).

    3. Turn the intelligent tester on.

    4. Clear the DTCs.

    5. Turn the power switch off.

    6. Turn the power switch on (IG).

    7. Check for DTCs.

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

    B

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

    A

    SYMPTOMS SIMULATION

  3. CHECK FOR OPEN IN MS BUS MAIN LINES (TILT AND TELESCOPIC ECU)


    1. A01NLX7E11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Tilt and Telescopic ECU)

      Disconnect the tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F36-5 (CANP) - F36-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    MULTIPLEX TILT AND TELESCOPIC ECU (for RHD) Click here

    C

    CHECK FOR OPEN IN MS BUS MAIN LINES (CAN NO. 8 J/C) Click here

    A

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (for LHD) Click here

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


    1. Reconnect the tilt and telescopic ECU connector.

    2. A01NM0NE29
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Tilt and Telescopic ECU
      *3

      to CAN No. 7 Junction Connector

      (w/ Power Back Door System)
      *4

      to CAN No. 6 Junction Connector

      (w/o Power Back Door System)

      Disconnect the CAN No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F103-3 (CANH) - F103-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Tilt and telescopic ECU
      F103-4 (CANH) - F103-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 7 junction connector (w/ Power Back Door System)
      F103-4 (CANH) - F103-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 6 junction connector (w/o Power Back Door System)
      Result
      Result Proceed to
      OK A
      NG (to Tilt and telescopic ECU) B
      NG (to CAN No. 7 junction connector main wire) C
      NG (to CAN No. 6 junction connector main wire) D

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 8 J/C - TILT AND TELESCOPIC ECU)

    C

    CHECK FOR OPEN IN MS BUS MAIN LINES (CAN NO. 7 J/C) Click here

    D

    CHECK FOR OPEN IN MS BUS MAIN LINES (CAN NO. 6 J/C) Click here

    A

    REPLACE CAN NO. 8 JUNCTION CONNECTOR

  5. CHECK FOR OPEN IN MS BUS MAIN LINES (CAN NO. 7 J/C)


    1. Reconnect the CAN No. 8 junction connector.

    2. A01NM0NE13
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to CAN No. 8 Junction Connector
      *3 to CAN No. 6 Junction Connector

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      P66-1 (CANH) - P66-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 8 junction connector
      P66-3 (CANH) - P66-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 6 junction connector
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 8 junction connector main wire) B
      NG (to CAN No. 6 junction connector main wire) C

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)

    C

    CHECK FOR OPEN IN MS BUS MAIN LINES (CAN NO. 6 J/C) Click here

    A

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

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


    1. Reconnect the CAN No. 7 junction connector (w/ Power back door system).

    2. Reconnect the CAN No. 8 junction connector (w/o Power back door system).

    3. A01NM0NE30
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *2 to Main Body ECU
      *3

      to CAN No. 7 Junction Connector

      (w/ Power Back Door System)
      *4

      to CAN No. 8 Junction Connector

      (w/o Power Back Door System)

      Disconnect the CAN No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F102-4 (CANH) - F102-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Main body ECU
      F102-3 (CANH) - F102-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 7 junction connector (w/ Power back door system)
      F102-3 (CANH) - F102-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 8 junction connector (w/o Power back door system)
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 7 junction connector main wire) B
      NG (to CAN No. 8 junction connector main wire) C
      NG (to Main body ECU main wire) D

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)

    C

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 8 J/C)

    D

    CHECK FOR OPEN IN MS BUS MAIN LINES (MAIN BODY ECU) Click here

    A

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  7. CHECK FOR OPEN IN MS BUS MAIN LINES (MAIN BODY ECU)


    1. Reconnect the CAN No. 6 junction connector.

    2. A01NN4BE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F14-9 (CANP) - F14-10 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - MAIN BODY ECU)

    OK

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

  8. CHECK FOR SHORT IN MS BUS LINES (TILT AND TELESCOPIC ECU)


    1. A01NLX7E11
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Tilt and Telescopic ECU)

      Disconnect the tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F36-5 (CANP) - F36-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    MULTIPLEX TILT AND TELESCOPIC ECU (for RHD) Click here

    C

    CHECK FOR SHORT IN MS BUS LINES (CAN NO. 8 J/C) Click here

    A

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (for LHD) Click here

  9. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 8 J/C)


    1. Reconnect the tilt and telescopic ECU connector.

    2. A01NM0NE31
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Tilt and Telescopic ECU
      *3

      to CAN No. 7 Junction Connector

      (w/ Power Back Door System)
      *4

      to CAN No. 6 Junction Connector

      (w/o Power Back Door System)

      Disconnect the CAN No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F103-3 (CANH) - F103-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Tilt and telescopic ECU
      F103-4 (CANH) - F103-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 7 junction connector (w/ Power Back Door System)
      F103-4 (CANH) - F103-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 6 junction connector (w/o Power Back Door System)
      Result
      Result Proceed to
      OK A
      NG (to Tilt and telescopic ECU main wire) B
      NG (to CAN No. 7 junction connector main wire) C
      NG (to CAN No. 6 junction connector main wire) D

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 8 J/C - TILT AND TELESCOPIC ECU)

    C

    CHECK FOR SHORT IN MS BUS LINES (CAN NO. 7 J/C) Click here

    D

    CHECK FOR SHORT IN MS BUS LINES (CAN NO. 6 J/C) Click here

    A

  10. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 8 J/C - FRONT POWER SEAT SWITCH RH)

    Tech Tips

    For vehicles without the position memory system, go to the next step.


    1. Disconnect the front power seat switch RH connector.

    2. A01NM0NE16
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Front Power Seat Switch RH

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F103-2 (CANH) - F103-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 8 J/C - FRONT POWER SEAT SWITCH RH)

    OK

  11. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 8 J/C - OUTER MIRROR CONTROL ECU RH)


    1. Disconnect the outer mirror control ECU RH connector.

    2. A01NM0NE17
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Outer Mirror Control ECU RH

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F103-5 (CANH) - F103-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 8 J/C - OUTER MIRROR CONTROL ECU RH)

    OK

  12. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 8 J/C - TIRE PRESSURE WARNING ECU AND RECEIVER)


    1. Disconnect the tire pressure warning ECU and receiver connector.

    2. A01NM0NE33
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Tire Pressure Warning ECU and Receiver

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F103-6 (CANH) - F103-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 8 J/C - TIRE PRESSURE WARNING ECU AND RECEIVER)

    OK

  13. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 8 J/C)


    1. Reconnect the CAN No. 8 junction connector.

    2. A01NLBCE05
      Text in Illustration
      *1

      Component with harness connector

      (Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F36-5 (CANP) - F36-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Note

      The resistance should only be measured when the ECUs connected to the CAN bus branch wires are disconnected, and the ECUs containing the terminating resistors are connected to the CAN main bus.


    NG

    REPLACE CAN NO. 8 JUNCTION CONNECTOR

    OK

  14. CHECK FOR SHORT IN MS BUS LINES (ECUS)


    1. A01NLBCE05
      Text in Illustration
      *1

      Component with harness connector

      (Tilt and Telescopic ECU)

      Connect the probes of an ohmmeter to terminals F36-5 (CANP) and F36-14 (CANN) of the tilt and telescopic ECU.

    2. While observing the resistance value shown on the tester, reconnect each ECU connector until the resistance becomes abnormal (Below 54 Ω).

    3. Replace the ECU that caused the total resistance to drop below 54 Ω when it was reconnected.

      Tech Tips

      If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.


    NEXT

    REPLACE CORRESPONDING ECU

  15. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 7 J/C)


    1. Reconnect the CAN No. 8 junction connector.

    2. A01NM0NE18
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to CAN No. 8 Junction Connector
      *3 to CAN No. 6 Junction Connector

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      P66-1 (CANH) - P66-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 8 junction connector
      P66-3 (CANH) - P66-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 6 junction connector
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 8 junction connector main wire) B
      NG (to CAN No. 6 junction connector main wire) C

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)

    C

    CHECK FOR SHORT IN MS BUS LINES (CAN NO. 6 J/C) Click here

    A

  16. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 7 J/C - POWER BACK DOOR ECU)


    1. Disconnect the power back door ECU connector.

    2. A01NM0NE19
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to Power Back Door ECU

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P66-2 (CANH) - P66-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 7 J/C - POWER BACK DOOR ECU)

    OK

  17. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 7 J/C)


    1. Reconnect the CAN No. 7 junction connector.

    2. A01NLBCE05
      Text in Illustration
      *1

      Component with harness connector

      (Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F36-5 (CANP) - F36-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Note

      The resistance should only be measured when the ECUs connected to the CAN bus branch wires are disconnected, and the ECUs containing the terminating resistors are connected to the CAN main bus.


    NG

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

    OK

    REPLACE POWER BACK DOOR UNIT ASSEMBLY (POWER BACK DOOR ECU) Click here

  18. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 6 J/C)


    1. Reconnect the CAN No. 7 junction connector (w/ Power back door system).

    2. Reconnect the CAN No. 8 junction connector (w/o Power back door system).

    3. A01NM0NE32
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *2

      to CAN No. 7 Junction Connector

      (w/ Power Back Door System)
      *3

      to CAN No. 8 Junction Connector

      (w/o Power Back Door System)
      *4 to Main Body ECU

      Disconnect the CAN No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      F102-3 (CANH) - F102-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 7 junction connector (w/ Power back door system)
      F102-3 (CANH) - F102-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω CAN No. 8 junction connector (w/o Power back door system)
      F102-4 (CANH) - F102-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Main body ECU
      Result
      Result Proceed to
      OK A
      NG (to CAN No. 7 junction connector main wire) B
      NG (to CAN No. 8 junction connector main wire) C
      NG (to Main body ECU) D

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)

    C

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 8 J/C)

    D

    CHECK FOR SHORT IN MS BUS LINES (MAIN BODY ECU) Click here

    A

  19. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 6 J/C - OUTER MIRROR CONTROL ECU LH)


    1. Disconnect the outer mirror control ECU LH connector.

    2. A01NM0NE21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *2 to Outer Mirror Control ECU LH

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F102-5 (CANH) - F102-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 6 J/C - OUTER MIRROR CONTROL ECU LH)

    OK

  20. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 6 J/C - FRONT POWER SEAT SWITCH LH)

    Tech Tips

    For vehicles without the position memory system, go to the next step.


    1. Disconnect the front power seat switch LH connector.

    2. A01NM0NE22
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *2 to Front Power Seat Switch LH

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F102-2 (CANH) - F102-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR (CAN NO. 6 J/C - FRONT POWER SEAT SWITCH LH)

    OK

  21. CHECK FOR SHORT IN MS BUS LINES (CAN NO. 6 J/C)


    1. Reconnect the CAN No. 6 junction connector.

    2. A01NLBCE05
      Text in Illustration
      *1

      Component with harness connector

      (Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F36-5 (CANP) - F36-14 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Note

      The resistance should only be measured when the ECUs connected to the CAN bus branch wires are disconnected, and the ECUs containing the terminating resistors are connected to the CAN main bus.


    NG

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

    OK

  22. CHECK FOR SHORT IN MS BUS LINES (ECUS)


    1. A01NLBCE05
      Text in Illustration
      *1

      Component with harness connector

      (Tilt and Telescopic ECU)

      Connect the probes of an ohmmeter to terminals F36-5 (CANP) and F36-14 (CANN) of the tilt and telescopic ECU.

    2. While observing the resistance value shown on the tester, reconnect each ECU connector until the resistance becomes abnormal (Below 54 Ω).

    3. Replace the ECU that caused the total resistance to drop below 54 Ω when it was reconnected.

      Tech Tips

      If the resistance becomes abnormal when an ECU connector is reconnected, there may be a short in the ECU.


    NEXT

    REPLACE CORRESPONDING ECU

  23. CHECK FOR SHORT IN MS BUS LINES (MAIN BODY ECU)


    1. Reconnect the CAN No. 6 junction connector.

    2. A01NN4BE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)

      Disconnect the main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F14-9 (CANP) - F14-10 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - MAIN BODY ECU)

    OK

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

  24. CHECK FOR SHORT IN MS BUS LINES (TILT AND TELESCOPIC ECU)


    1. A01NLX7E14
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Tilt and Telescopic ECU)

      Disconnect the tilt and telescopic ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      F36-5 (CANP) - F36-11 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      F36-14 (CANN) - F36-11 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F36-5 (CANP) - F36-2 (+B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F36-14 (CANN) - F36-2 (+B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    MULTIPLEX TILT AND TELESCOPIC ECU (for RHD) Click here

    C

    CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 8) Click here

    A

    REPLACE MULTIPLEX TILT AND TELESCOPIC ECU (for LHD) Click here

  25. CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 8)


    1. A01NN1HE23
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Tilt and Telescopic ECU
      *3

      to CAN No. 7 Junction Connector

      (w/ Power Back Door System)
      *4

      to CAN No. 6 Junction Connector

      (w/o Power Back Door System)
      *5 DLC3

      Disconnect the CAN No. 8 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      F103-3 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Tilt and telescopic ECU
      F103-14 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F103-3 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F103-14 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F103-4 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short

      CAN No. 7 junction connector

      (w/ Power back door system)
      F103-15 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F103-4 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F103-15 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F103-4 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short

      CAN No. 6 junction connector

      (w/o Power back door system)
      F103-15 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F103-4 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F103-15 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      Result
      Result Proceed to
      OK A
      NG (to Tilt and telescopic ECU main wire) B
      NG (to CAN No. 7 junction connector main wire) C
      NG (to CAN No. 6 junction connector main wire) D

      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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.


    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 8 J/C - TILT AND TELESCOPIC ECU)

    C

    CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 7 MAIN WIRE) Click here

    D

    CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 6 MAIN WIRE) Click here

    A

  26. CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 8 BRANCH WIRE)


    1. A01NN1HE24
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 8 Junction Connector)
      *2 to Front Power Seat Switch RH
      *3 to Outer Mirror Control ECU RH
      *4 to Tire Pressure Warning ECU and Receiver
      *5 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      F103-2 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Front power seat switch RH
      F103-13 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F103-2 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F103-13 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F103-5 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Outer mirror control ECU RH
      F103-16 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F103-5 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F103-16 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F103-6 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Tire pressure warning ECU and receiver
      F103-17 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F103-6 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F103-17 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.


    NG

    CHECK FOR SHORT IN MS BUS LINES Click here

    OK

    REPLACE CAN NO. 8 JUNCTION CONNECTOR

  27. CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 7 MAIN WIRE)


    1. A01NN1HE14
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to CAN No. 8 Junction Connector
      *3 to CAN No. 6 Junction Connector
      *4 DLC3

      Disconnect the CAN No. 7 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      P66-1 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short CAN No. 8 junction connector
      P66-12 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      P66-1 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      P66-12 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      P66-3 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short CAN No. 6 junction connector
      P66-14 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      P66-3 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      P66-14 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.

      Result
      Result Proceed to
      OK A
      NG (to CAN No. 8 junction connector main wire) B
      NG (to CAN No. 6 junction connector main wire) C

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 7 J/C - CAN NO. 8 J/C)

    C

    CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 6 MAIN WIRE) Click here

    A

  28. CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 7 BRANCH WIRE)


    1. A01NN1HE15
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 7 Junction Connector)
      *2 to Power Back Door ECU
      *3 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      P66-2 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Power back door ECU
      P66-13 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      P66-2 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      P66-13 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.


    NG

    CHECK FOR SHORT IN MS BUS LINES Click here

    OK

    REPLACE CAN NO. 7 JUNCTION CONNECTOR

  29. CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 6 MAIN WIRE)


    1. A01NN1HE25
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *2

      to CAN No. 7 Junction Connector

      (w/ Power Back Door System)
      *3

      to CAN No. 8 Junction Connector

      (w/o Power Back Door System)
      *4 to Main Body ECU
      *5 DLC3

      Disconnect the CAN No. 6 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      F102-3 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short

      CAN No. 7 junction connector

      (w/ Power back door system)
      F102-14 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F102-3 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F102-14 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F102-3 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short

      CAN No. 8 junction connector

      (w/o Power back door system)
      F102-14 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F102-3 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F102-14 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F102-4 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Main body ECU
      F102-15 (CANL) - F17-4 (CG)

      Power switch off

      Cable disconnected from negative (-) auxiliary battery terminal

      		 200 Ω or higher Inspection for CANL ground short
      F102-4 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F102-15 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.

      Result
      Result Proceed to
      OK A
      NG (to CAN No. 7 junction connector main wire) B
      NG (to CAN No. 8 junction connector main wire) C
      NG (Main body ECU main wire) D

    B

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 7 J/C)

    C

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - CAN NO. 8 J/C)

    D

    CHECK FOR SHORT IN MS BUS LINES Click here

    A

  30. CHECK FOR SHORT IN MS BUS LINES (CAN J/C NO. 6 BRANCH WIRE)


    1. A01NN1HE17
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 6 Junction Connector)
      *2 to Front Power Seat Switch LH
      *3 to Outer Mirror Control ECU LH
      *4 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      F102-2 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Front power seat switch LH
      F102-13 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F102-2 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F102-13 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      F102-5 (CANH) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short Outer mirror control ECU LH
      F102-16 (CANL) - F17-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F102-5 (CANH) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F102-16 (CANL) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.


    NG

    CHECK FOR SHORT IN MS BUS LINES Click here

    OK

    REPLACE CAN NO. 6 JUNCTION CONNECTOR

  31. CHECK FOR SHORT IN MS BUS LINES


    1. A01NN7YE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)
      *2 DLC3

      Disconnect the main body ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      F14-9 (CANP) - F14-3 (GND2) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      F14-10 (CANN) - F14-3 (GND2) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F14-9 (CANP) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F14-10 (CANN) - F17-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 CAN MS Bus Wire inspection.

      Find the necessary inspection from the Purpose column that matches the result in the Result column from the Check CAN MS Bus Wire inspection.


    NG

    REPAIR OR REPLACE CAN MS BUS MAIN WIRE OR CONNECTOR (CAN NO. 6 J/C - MAIN BODY ECU)

    OK

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

  32. CHECK FOR SHORT IN MS BUS LINES


    1. Reconnect the connector for the bus wire that is shorted to +B or GND to the CAN junction connector (the connector that caused the bus wire 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 ECU or sensor connected to the CAN bus wire that is shorted to +B or GND.

      Tech Tips

      If the ECU or sensor has multiple connectors, disconnect the connector that includes the CAN bus wires. To determine the ECU or sensor that is connected to the shorted bus wire, refer to the terminals of ECU tables Click here.

    3. A01NLBCE04
      Text in Illustration
      *1

      Component with harness connected

      (Tilt and Telescopic ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      F36-5 (CANP) - F36-11 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANH ground short
      F36-14 (CANN) - F36-11 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Inspection for CANL ground short
      F36-5 (CANP) - F36-2 (+B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      F36-14 (CANN) - F36-2 (+B) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short

      Tech Tips

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


    NG

    REPAIR OR REPLACE CAN MS BUS BRANCH WIRE OR CONNECTOR

    OK

    REPLACE CORRESPONDING ECU