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

DESCRIPTION

There may be a short circuit between the CAN bus lines and GND when the resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ω.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 200 Ω.

  • Short between CAN bus lines and GND

  • 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

B001ZBPE01
B001Y18E01
*a No. 3 Junction Connector
*b Combination Meter Assembly

CAUTION / NOTICE / HINT

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 GND IN CAN BUS WIRE (DLC3 CAN BRANCH WIRE)


    1. B001Y95C24
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E22-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω 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 GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    1. B001Y95C24
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E22-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  6. CHECK FOR SHORT TO GND 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 GND in CAN Bus Wire (No. 1 Junction Connector - Main Body ECU)".


    1. B001YU0E02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E72-15 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

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


    1. B001XJKE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E72-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

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


    1. B00206HE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E72-13 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

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

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


    1. B001YU0E02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E72-15 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

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

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


    1. B001XJKE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E72-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

    NG

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

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


    1. B00206HE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E72-13 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (for 1GR-FE) A
      OK (for 1UR-FE) B
      OK (for 1VD-FTV) C
      NG D

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

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

  12. CONNECT CONNECTOR


    1. Reconnect the E72 No. 1 junction connector.


    NEXT

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


    1. B001Z77E02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-15 (CANL) - E22-4 (CG) Ignition switch off 200 Ω 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 GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR SIDE)


    1. B001Y95C24
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E22-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  15. CHECK FOR SHORT TO GND 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 GND in CAN Bus Wire (No. 2 Junction Connector - Air Conditioning Amplifier)".


    1. B001YH6E02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-13 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

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


    1. B001XWUE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-16 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  17. CHECK FOR SHORT TO GND 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 GND in CAN Bus Wire (No. 2 Junction Connector - Network Gateway ECU)".


    1. B001ZZUE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-18 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

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


    1. B001Z5YE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

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

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


    1. B001YH6E02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-13 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    NG

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

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


    1. B001XWUE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-16 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

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

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


    1. B001ZZUE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-18 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

    NG

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

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


    1. B001Z5YE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E69-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

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

  23. CONNECT CONNECTOR


    1. Reconnect the E69 No. 2 junction connector.


    NEXT

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


    1. B001X5BE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E75-12 (CANL) - E22-4 (CG) Ignition switch off 200 Ω 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 GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. B001Y0FE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E75-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

    NG

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


    1. B001Y0FE02
      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) - E22-4 (CG) Ignition switch off 200 Ω or higher
      E75-14 (CANL) - E22-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (w/ Multi-information Display) A
      OK (w/o Multi-information Display) B
      NG C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

    REPLACE COMBINATION METER ASSEMBLY Click here

    C

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