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

DESCRIPTION

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

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

  • Short to +B

  • ECM

  • Center airbag sensor assembly

  • Headlight swivel ECU assembly (AFS ECU)

  • Multi-media module receiver assembly

  • 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

A01ERKGE01
A01EMU6E04

INSPECTION PROCEDURE

Note

The vehicle is equipped with an SRS (Supplemental Restraint System) which includes components such as airbags. Before servicing (including removal or installation of parts), be sure to read the Precaution in the SRS Click here.

Tech Tips

Operating the engine 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 engine 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:

      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 BRANCH WIRE)


    1. A01ER7DE05
      Text in Illustration
      *1 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) Engine switch off 6 kΩ or higher
      E22-14 (CANL) - E22-16 (BAT) Engine 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. A01ER7DE05
      Text in Illustration
      *1 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) Engine switch off 6 kΩ or higher
      E22-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

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


    1. A01ERBIE23
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E72-15 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

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


    1. A01ERBIE41
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E72-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

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


    1. A01ERBIE24
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E72-13 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR

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


    1. A01ERBIE23
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 DLC3

      Disconnect the E47 center airbag sensor connector Click here.

    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) Engine switch off 6 kΩ or higher
      E72-15 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

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

    A01ERBIE41
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 1 Junction Connector)
    *2 DLC3

    1. Disconnect the E91 headlight swivel ECU assembly (AFS ECU) 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) Engine switch off 6 kΩ or higher
      E72-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AFS ECU (HEADLIGHT SWIVEL ECU ASSEMBLY) (CANH, CANL)

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY (AFS ECU) Click here

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


    1. A01ERBIE24
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)
      *2 DLC3

      Disconnect the A38 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) Engine switch off 6 kΩ or higher
      E72-13 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPLACE ECM Click here

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


    1. A01ERBIE25
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 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
      E69-1 (CANH) - E22-16 (BAT) Engine switch off 6 kΩ or higher
      E69-12 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

  13. CONNECT CONNECTOR


    1. Reconnect the E72 No. 1 junction connector.


    NEXT

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


    1. A01ER7DE05
      Text in Illustration
      *1 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) Engine switch off 6 kΩ or higher
      E22-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

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


    1. A01ERBIE26
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E69-13 (CANL) - E22-16 (BAT) Engine 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)


    1. A01ERBIE27
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E69-16 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

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


    1. A01ERBIE28
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E69-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR

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


    1. A01ERBIE26
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 DLC3

      Disconnect the F76 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) Engine switch off 6 kΩ or higher
      E69-13 (CANL) - E22-16 (BAT) Engine 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

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


    1. A01ERBIE27
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *2 DLC3

      Disconnect the E35 air conditioning amplifier connector.

    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) Engine switch off 6 kΩ or higher
      E69-16 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

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

    A01ERBIE28
    Text in Illustration
    *1

    Rear view of wire harness connector

    (to No. 2 Junction Connector)
    *2 DLC3

    1. 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) Engine switch off 6 kΩ or higher
      E69-14 (CANL) - E22-16 (BAT) Engine 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

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


    1. A01ERBIE29
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E75-12 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

  22. CONNECT CONNECTOR


    1. Reconnect the E69 No. 2 junction connector.


    NEXT

  23. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A01ERBIE30
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *2 DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E75-4 (CANH) - E22-16 (BAT) Engine switch off 6 kΩ or higher
      E75-15 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

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


    1. A01ERBIE31
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *2 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) Engine switch off 6 kΩ or higher
      E75-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

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


    1. A01ERBIE30
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *2 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
      E75-4 (CANH) - E22-16 (BAT) Engine switch off 6 kΩ or higher
      E75-15 (CANL) - E22-16 (BAT) Engine 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)

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


    1. A01ERBIE31
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)
      *2 DLC3

      Disconnect the E77 combination meter 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) Engine switch off 6 kΩ or higher
      E75-14 (CANL) - E22-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here