CAN COMMUNICATION SYSTEM Short in CAN Bus Lines

DESCRIPTION

There may be a short circuit between the CAN bus lines when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

  • Short between CAN bus lines

  • ECM

  • Brake actuator assembly (VSC ECU)

  • Parking brake with bracket actuator assembly (electric parking brake ECU)

  • Certification ECU*1

  • Air conditioning amplifier assembly

  • Spiral cable sub-assembly (steering angle sensor)

  • Yaw rate sensor

  • Main body ECU (instrument panel junction block assembly)

  • Center airbag sensor assembly

  • Power management control ECU*1, *2

  • Power steering ECU assembly

  • Combination meter assembly

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

  • No. 4 junction connector

WIRING DIAGRAM

A00E91LE01
A00E88XE01

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. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


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

      CAUTION:

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

      Note


      • w/ Navigation System (for HDD):

        After the ignition switch is turned off, the HDD navigation system requires approximately a minute to record various types of memory and settings. As a result, after turning the ignition switch off, wait a minute or more before disconnecting the cable from the negative (-) battery terminal.

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


    NEXT

  2. CHECK FOR SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE)


    1. Disconnect the D119 No. 3 junction connector connector.

    2. A00EA7OE36
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D8-6 (CANH) - D8-14 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

  3. CONNECT CONNECTOR


    1. Reconnect the D119 No. 3 junction connector connector.


    NEXT

  4. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR SIDE)


    1. Disconnect the A39 No. 1 junction connector connector.

    2. A00EA7OE36
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D8-6 (CANH) - D8-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR) Click here

    OK

  5. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - BRAKE ACTUATOR)


    1. A00E7V4E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-8 (CANH) - A39-19 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (BRAKE ACTUATOR) Click here

    OK

  6. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - ECM)


    1. A00E7V4E31
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-10 (CANH) - A39-21 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (ECM) Click here

    OK

    REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR

  7. CHECK FOR SHORT IN CAN BUS WIRES (BRAKE ACTUATOR)


    1. Disconnect the A42 brake actuator assembly (VSC ECU) connector.

    2. A00E7V4E01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-8 (CANH) - A39-19 (CANL) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO SKID CONTROL ECU (CANH, CANL)

    OK

    REPLACE BRAKE ACTUATOR ASSEMBLY (VSC ECU)

  8. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. Disconnect the A40 ECM connector.

    2. A00E7V4E31
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 1 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A39-10 (CANH) - A39-21 (CANL) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (for 1AD-FTV) A
      OK (for 2AD-FTV) B
      OK (for 2AD-FHV) 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

  9. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    1. A00E7V4E03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 junction connector)

      Disconnect the G39 No. 2 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      C39-1 (CANH) - C39-12 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

  10. CONNECT CONNECTOR


    1. Reconnect the A39 No. 1 junction connector connector.


    NEXT

  11. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR SIDE)

    A00EA7OE36
    Text in Illustration
    *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D8-6 (CANH) - D8-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR) Click here

    OK

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - ELECTRIC PARKING BRAKE ECU)


    1. A00E7V4E23
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G39-3 (CANH) - G39-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (ELECTRIC PARKING BRAKE ECU) Click here

    OK

    REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR

  13. CHECK FOR SHORT IN CAN BUS WIRES (ELECTRIC PARKING BRAKE ECU)


    1. Disconnect the I1 parking brake with bracket actuator assembly (electric parking brake ECU) connector.

    2. A00E7V4E23
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 2 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      G39-3 (CANH) - G39-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO PARKING BRAKE WITH BRACKET ACTUATOR (CANH, CANL)

    OK

    REPLACE PARKING BRAKE WITH BRACKET ACTUATOR ASSEMBLY (ELECTRIC PARKING BRAKE ECU) Click here

  14. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)


    1. A00E9QKE10
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

      Disconnect the D119 No. 3 junction connector connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-10 (CANH) - D119-21 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

  15. CONNECT CONNECTOR


    1. Reconnect the G39 No. 2 junction connector connector.

    2. Reconnect the D119 No. 3 junction connector connector.


    NEXT

  16. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR SIDE)


    1. Disconnect the D91 No. 4 junction connector connector.

    2. A00EA7OE36
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D8-6 (CANH) - D8-14 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR) Click here

    OK

  17. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU)

    Note

    For vehicles without a battery current sensor and an entry and start system, go to "Check for Short in CAN Bus Wires (No. 4 Junction Connector - Combination Meter)".


    1. A00E7V4E25
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-3 (CANH) - D91-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU) Click here

    OK

  18. CHECK FOR SHORT IN CAN BUS WIRES (NO. 4 JUNCTION CONNECTOR - COMBINATION METER)


    1. A00E7V4E05
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-2 (CANH) - D91-13 (CANL) Ignition switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER) Click here

    OK

    REPAIR OR REPLACE NO. 4 JUNCTION CONNECTOR

  19. CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the D111 power management control ECU connector.

    2. A00E7V4E25
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-3 (CANH) - D91-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER MANAGEMENT CONTROL ECU (CA1H, CA1L)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  20. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER)


    1. Disconnect the D66 combination meter assembly connector.

    2. A00E7V4E05
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-2 (CANH) - D91-13 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  21. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)


    1. Disconnect the D119 No. 3 junction connector connector.

    2. A00E7V4E26
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 4 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D91-1 (CANH) - D91-12 (CANL) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

    OK

  22. CONNECT CONNECTOR


    1. Reconnect the D91 No. 4 junction connector connector.


    NEXT

  23. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - CERTIFICATION ECU)

    Note

    For vehicles without an entry and start system, go to "Check for Short in CAN Bus Wires (No. 3 Junction Connector - Power Steering ECU)".


    1. A00E9QKE12
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-2 (CANH) - D119-13 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU) Click here

    OK

  24. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - POWER STEERING ECU)


    1. A00E9QKE13
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-3 (CANH) - D119-14 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU) Click here

    OK

  25. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER)


    1. A00E9QKE14
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-4 (CANH) - D119-15 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER) Click here

    OK

  26. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - SPIRAL CABLE)


    1. A00E9QKE15
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-5 (CANH) - D119-16 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (SPIRAL CABLE) Click here

    OK

  27. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - YAW RATE SENSOR)


    1. A00E9QKE16
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-6 (CANH) - D119-17 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR) Click here

    OK

  28. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A00E9QKE17
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-8 (CANH) - D119-19 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU) Click here

    OK

  29. CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR)


    1. A00E9QKE18
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-9 (CANH) - D119-20 (CANL) Ignition switch off 200 Ω or higher

    NG

    CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR) Click here

    OK

    REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

  30. CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU)


    1. Disconnect the D54 certification ECU connector.

    2. A00E9QKE12
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-2 (CANH) - D119-13 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE CERTIFICATION ECU

  31. CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU)


    1. Disconnect the D50 power steering ECU connector.

    2. A00E9QKE13
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-3 (CANH) - D119-14 (CANL) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER STEERING ECU (CANH, CANL)

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

  32. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER)


    1. Disconnect the D47*1 or D101*2 air conditioning amplifier connector.


      • *1: for Automatic Air Conditioning System

      • *2: for Manual Air Conditioning System and w/o Air Conditioning System

    2. A00E9QKE14
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-4 (CANH) - D119-15 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  33. CHECK FOR SHORT IN CAN BUS WIRES (SPIRAL CABLE)


    1. Disconnect the D71 spiral cable sub-assembly (steering angle sensor) connector.

    2. A00E9QKE15
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-5 (CANH) - D119-16 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE SPIRAL CABLE SUB-ASSEMBLY Click here

  34. CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)


    1. Disconnect the D69 yaw rate sensor connector.

    2. A00E9QKE16
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-6 (CANH) - D119-17 (CANL) Ignition switch off 1 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO YAW RATE SENSOR (CANH, CANL)

    OK

    REPLACE YAW RATE SENSOR Click here

  35. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)


    1. Disconnect the D81 main body ECU (instrument panel junction block assembly) connector.

    2. A00E9QKE17
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 Junction Connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-8 (CANH) - D119-19 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE MAIN BODY ECU (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

  36. CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR)


    1. Disconnect the D10 center airbag sensor assembly connector.

    2. A00E9QKE18
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to No. 3 junction connector)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      D119-9 (CANH) - D119-20 (CANL) Ignition switch off 200 Ω or higher

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here