CAN COMMUNICATION SYSTEM (for RHD) Short to B+ in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus lines and +B when the resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3 is below 6 kΩ.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3 is below 6 kΩ.

  • Short between CAN bus lines and +B

  • ECM

  • Center airbag sensor assembly*1

  • Headlight swivel ECU assembly*2

  • Multi-media module receiver assembly*3

  • Air conditioning amplifier assembly

  • Network gateway ECU

  • Main body ECU (cowl side junction block LH)

  • Combination meter assembly

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

WIRING DIAGRAM

A01591WE01
A015DFPE01

INSPECTION PROCEDURE

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE


  1. PRECAUTION

    Note

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and the CAN branch wire.

      CAUTION:

      For vehicles with an SRS system:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.


    NEXT

  3. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (DLC3 CAN BRANCH WIRE)


    1. A0157YPE07
      Text in Illustration
      *a Front view of DLC3

      Disconnect the E75 No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E22-6 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E22-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)

    OK

  4. CONNECT CONNECTOR


    1. Reconnect the E75 No. 3 junction connector.


    NEXT

  5. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    1. A0157YPE07
      Text in Illustration
      *a Front view of DLC3

      Disconnect the E72 No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E22-6 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E22-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  6. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)

    Note

    For vehicles without an airbag system, go to "Check for Short to B+ in CAN Bus Wire (No. 1 Junction Connector - Main Body ECU)".


    1. A0157V1E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E72-4 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E72-15 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTER AIRBAG SENSOR ASSEMBLY) Click here

    OK

  7. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A0157V1E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E72-3 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E72-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MAIN BODY ECU) Click here

    OK

  8. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)


    1. A0157V1E03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E72-2 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E72-13 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECM) Click here

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

  9. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTER AIRBAG SENSOR ASSEMBLY)


    1. A0157V1E02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

      Disconnect the E47 center airbag sensor assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E72-4 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E72-15 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (CANH, CANL)

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  10. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MAIN BODY ECU)


    1. A0157V1E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

      Disconnect the E3 main body ECU (cowl side junction block LH) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E72-3 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E72-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CANH, CANL)

    OK

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

  11. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ECM)


    1. A0157V1E03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *b Front view of DLC3

      Disconnect the A52 ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E72-2 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E72-13 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      Result
      Result Proceed to
      OK (for 1GR-FE) A
      OK (for 1UR-FE) B
      OK (for 1VD-FTV) C
      NG D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CANH, CANL)

    A

    REPLACE ECM Click here

  12. CONNECT CONNECTOR


    1. Reconnect the E72 No. 1 junction connector.


    NEXT

  13. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)


    1. A0157V1E53
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the E69 No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-4 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-15 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

    OK

  14. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR SIDE)


    1. A0157YPE07
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E22-6 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E22-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  15. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    Note

    For vehicles without an navigation system, go to "Check for Short to B+ in CAN Bus Wire (No. 2 Junction Connector - Air Conditioning Amplifier)".


    1. A0157V1E05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-2 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-13 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY) Click here

    OK

  16. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A0157V1E07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-5 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-16 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY) Click here

    OK

  17. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - HEADLIGHT SWIVEL ECU ASSEMBLY)

    Note

    For vehicles without an dynamic headlight auto leveling, go to "Check for Short to B+ in CAN Bus Wire (No. 2 Junction Connector - Network Gateway ECU)".


    1. A0157V1E54
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-7 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-18 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY) Click here

    OK

  18. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)


    1. A0157V1E06
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-3 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NETWORK GATEWAY ECU) Click here

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  19. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A0157V1E05
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the F77 multi-media module receiver assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-2 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-13 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTI-MEDIA MODULE RECEIVER ASSEMBLY (CANH, CANL)

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  20. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A0157V1E07
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the E35*1 or E81*2 air conditioning amplifier connector.


      • *1: w/ Rear Air Conditioning System

      • *2: w/o Rear Air Conditioning System

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-5 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-16 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER ASSEMBLY (CANH, CANL)

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  21. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY)


    1. A0157V1E54
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the E101 headlight swivel ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-7 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-18 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO HEADLIGHT SWIVEL ECU ASSEMBLY (MPX1, MPX2)

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

  22. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NETWORK GATEWAY ECU)


    1. A0157V1E06
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the E31 network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E69-3 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E69-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NETWORK GATEWAY ECU (CANH, CANL)

    OK

    REPLACE NETWORK GATEWAY ECU Click here

  23. CONNECT CONNECTOR


    1. Reconnect the E69 No. 2 junction connector.


    NEXT

  24. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A0157V1E08
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *b Front view of DLC3

      Disconnect the E75 No. 3 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E75-1 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E75-12 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

    OK

  25. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. A0157V1E10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *b Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E75-3 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E75-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher

    NG

    CHECK FOR SHORT TO B+ IN CAN BUS WIRE (COMBINATION METER ASSEMBLY) Click here

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

  26. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (COMBINATION METER ASSEMBLY)


    1. A0157V1E10
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *b Front view of DLC3

      Disconnect the E7 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E75-3 (CANH) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      E75-14 (CANL) - E22-16 (BAT) Ignition switch off 6 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Multi-information Display) A
      OK (w/o Multi-information Display) B
      NG C

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    C

    REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (CANH, CANL)

    A

    REPLACE COMBINATION METER ASSEMBLY Click here