CAN COMMUNICATION SYSTEM Check CAN Bus Lines for Short Circuit (LHD Models)

DESCRIPTION

There may be a short circuit in the CAN bus main wire and/or CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

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

  • Short in CAN bus main wire

  • Short in CAN bus branch wire

  • ECM

  • Certification ECU (Smart key ECU)

  • Combination meter

  • Power steering ECU

  • Center airbag sensor assembly

  • Skid control ECU

  • Steering angle sensor

  • Yaw rate sensor

  • Main body ECU (Multiplex network body ECU)

  • Power management control ECU

  • Multi-media module receiver assembly*1

  • Radio receiver assembly*2

  • CAN No. 1 junction connector

  • CAN No. 2 junction connector

*1: w/ Navigation system

*2: w/ Audio and visual system (w/ Multi-display)

WIRING DIAGRAM

A01NM2GE02
A01NIG9E03

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 FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - CAN NO. 2 J/C)


    1. Turn the power switch off.

    2. A01NIZEE62
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to CAN No. 2 Junction Connector

      Disconnect the CAN No. 1 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-7 (CANH) - F70-18 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C) Click here

    OK

  2. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)


    1. A01NIZEE92
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-9 (CANH) - F70-20 (CANL) Power switch off 108 to 132 Ω

    NG

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

    OK

  3. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - DLC3)


    1. A01NIZEE64
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to DLC3

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-3 (CANH) - F70-14 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3

    OK

  4. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - COMBINATION METER)


    1. A01NISRE03

      Disconnect the combination meter connector.

    2. A01NIZEE65
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Combination Meter

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-4 (CANH) - F70-15 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - COMBINATION METER)

    OK

  5. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - STEERING ANGLE SENSOR)


    1. A01NJLYE27

      Disconnect the steering angle sensor connector.

    2. A01NIZEE66
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Angle Sensor)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Steering Angle Sensor

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-2 (CANH) - F70-13 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - STEERING ANGLE SENSOR)

    OK

  6. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - POWER STEERING ECU)


    1. A01NMPDE15

      Disconnect the power steering ECU connector.

    2. A01NIZEE69
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Power Steering ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Power Steering ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-1 (CANH) - F70-12 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER STEERING ECU)

    OK

  7. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - YAW RATE SENSOR)


    1. A01NKYUE11

      Disconnect the yaw rate sensor connector.

    2. A01NIZEE68
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Yaw Rate Sensor)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Yaw Rate Sensor

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-11 (CANH) - F70-22 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - YAW RATE SENSOR)

    OK

  8. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A01NJEQE11

      Disconnect the center airbag sensor assembly connector.

    2. A01NIZEE70
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Center Airbag Sensor Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-10 (CANH) - F70-21 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - CENTER AIRBAG SENSOR ASSEMBLY)

    OK

  9. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 1 J/C - MAIN BODY ECU)


    1. A01NNCIE01

      Disconnect the main body ECU connector.

    2. A01NIZEE71
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Main Body ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *3 to Main Body ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-5 (CANH) - F70-16 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - MAIN BODY ECU)

    OK

  10. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C)


    1. Reconnect the CAN No. 1 junction connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

      Note

      The resistance must be measured after the main wire connected ECUs (ECM and power management control ECU), and the CAN No. 1 and No. 2 junction connectors are reconnected.


    NG

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

    OK

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


    1. Reconnect the combination meter connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE COMBINATION METER Click here

    OK

  12. CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR)


    1. Reconnect the steering angle sensor connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE SPIRAL CABLE WITH STEERING ANGLE SENSOR Click here

    OK

  13. CHECK FOR SHORT IN CAN BUS WIRE (POWER STEERING ECU)


    1. Reconnect the power steering ECU connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE POWER STEERING ECU Click here

    OK

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


    1. Reconnect the yaw rate sensor connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE YAW RATE AND ACCELERATION SENSOR Click here

    OK

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


    1. Reconnect the center airbag sensor assembly connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

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

  16. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - CAN NO. 1 J/C)


    1. Reconnect the CAN No. 1 junction connector.

    2. A01NIZEE74
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to CAN No. 1 Junction Connector

      Disconnect the CAN No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-7 (CANH) - F71-18 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 J/C)

    OK

  17. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - ECM)


    1. A01NI9EE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *2 to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-9 (CANH) - F71-20 (CANL) Power switch off 108 to 132 Ω

    NG

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

    OK

  18. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CERTIFICATION ECU)


    1. A01NJPAE07

      Disconnect the certification ECU connector.

    2. A01NIZEE95
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Certification ECU)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Certification ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-2 (CANH) - F71-13 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - CERTIFICATION ECU)

    OK

  19. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - SKID CONTROL ECU)


    1. A01NJECE09
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Skid Control ECU)

      Disconnect the skid control ECU connector.

    2. A01NIZEE73
      Text in Illustration
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Skid Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-1 (CANH) - F71-12 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - SKID CONTROL ECU)

    OK

  20. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    Tech Tips

    For vehicles without the navigation system, go to the next step.


    1. A01NI8YE16

      Disconnect the multi-media module receiver assembly connector.

    2. A01NIZEE75
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Multi-media Module Receiver Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-8 (CANH) - F71-19 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)

    OK

  21. CHECK FOR SHORT IN CAN BUS WIRE (CAN NO. 2 J/C - RADIO RECEIVER ASSEMBLY)

    Tech Tips

    For vehicles without the audio and visual system (with multi-display), go to the next step.


    1. A01NJIBE33

      Disconnect the radio receiver assembly connector.

    2. A01NIZEE75
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Radio Receiver Assembly)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to Radio Receiver Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-8 (CANH) - F71-19 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CAN NO. 2 J/C - RADIO RECEIVER ASSEMBLY)

    OK

  22. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C)


    1. Reconnect the CAN No. 1 and No. 2 junction connectors.

    2. A01NLZ9E01
      Text in Illustration
      *1 DLC3

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

      Note

      The resistance must be measured after the main wire connected ECUs (ECM and power management control ECU), and the CAN No. 1 and No. 2 junction connectors are reconnected.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE CAN NO. 2 JUNCTION CONNECTOR

    OK

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


    1. Reconnect the certification ECU.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω
      Result
      Result Proceed to
      OK (w/ Navigation system or w/ Audio and visual system (w/ Multi-display)) A
      OK (w/o Navigation system or w/o Audio and visual system (w/ Multi-display)) B
      NG C

    B

    REPLACE SKID CONTROL ECU Click here

    C

    REPLACE CERTIFICATION ECU (SMART KEY ECU)

    A

  24. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)


    1. Reconnect the skid control ECU connector.

    2. A01NLZ9E01
      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
      F17-6 (CANH) - F17-14 (CANL) Power switch off 54 to 69 Ω
      Result
      Result Proceed to
      OK (w/ Navigation system) A
      OK (w/ Audio and visual system (w/ Multi-display)) B
      NG C

    B

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    C

    REPLACE SKID CONTROL ECU Click here

    A

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  25. CHECK FOR SHORT IN CAN BUS WIRE (ECM)


    1. A01NM3YE07

      Disconnect the ECM connector.

    2. A01NIZEE96

      Disconnect the CAN No. 2 junction connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F71-9 (CANH) - F71-20 (CANL) Power switch off 1 MΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to ECM)
      *2

      Front view of wire harness connector

      (to CAN No. 2 Junction Connector)
      *3 to ECM

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 2 J/C - ECM)

    OK

    REPLACE ECM Click here

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


    1. A01NKJHE01
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

    2. A01NIZEE94
      Text in Illustration
      *1

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *2 to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      F70-9 (CANH) - F70-20 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (CAN NO. 1 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here