CAN COMMUNICATION SYSTEM(for LHD) 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 53 Ω.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 53 Ω.
  • Short between CAN bus lines

  • ECM

  • Brake actuator assembly (skid control ECU)

  • Spiral with sensor cable sub-assembly (steering angle sensor)*1

  • Air conditioning amplifier assembly*2

  • Airbag sensor assembly*8

  • Certification ECU (smart key ECU assembly)*3

  • 4 wheel drive control ECU*4

  • Radio and display receiver assembly*5

  • Navigation receiver assembly*6

  • Headlight leveling ECU assembly*7

  • Combination meter assembly

  • No. 1 CAN junction connector

  • No. 2 CAN junction connector

  • DLC3 CAN branch wire or connector

*1: w/ VSC
*2: for Automatic Air Conditioning System or for Manual Air Conditioning System (w/ PTC Heater)
*3: w/ Entry and Start System
*4: for 4WD
*5: w/ Audio and Visual System (for Radio and Display Type)
*6: w/ Navigation System
*7: for LED Headlight or w/ Headlight Cleaner System
*8: w/ Airbag System

WIRING DIAGRAM

B00271WE01
B0026CHE02

CAUTION / NOTICE / HINT

Note


  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key, switches or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • 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

  • 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.

    Type A:

    Click here

    Type B:

    Click here

  • When replacing the combination meter assembly, make sure to replace it with a new one.

  • Before replacing the certification ECU (smart key ECU assembly), refer to the service bulletin.

Tech Tips


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

  • 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.

  • Connectors that connect to the CAN junction connector can be distinguished by the color of their CAN bus lines. When the connectors have been disconnected from the CAN junction connector, reconnecting the connectors to non-original positions on the CAN junction connector does not affect system performance. However, it is preferred to reconnect the connectors to their original positions to avoid negative effects on the wiring such as tension on the wiring harnesses, and to make future maintenance easier.

  • When replacing the navigation receiver assembly, it is necessary to perform the vehicle contract setting for Connected Services.

    Click here

PROCEDURE


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


    1. B0028U4C24
      *a Front view of DLC3

      Disconnect the cable from the negative (-) battery terminal.

    2. Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G8-6 (CANH) - G8-14 (CANL) Cable disconnected from negative (-) battery terminal 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  2. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

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


    1. B0028U4C24
      *a Front view of DLC3

      Disconnect the No. 2 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G8-6 (CANH) - G8-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 CAN JUNCTION CONNECTOR)


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

      B0028MXC70
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Connector)

      *b to Certification ECU (Smart Key ECU Assembly) (w/ Entry and Start System)
      *c to 4 Wheel Drive Control ECU (for 4WD) *d to ECM
      *e
      • to Radio and Display Receiver Assembly (w/ Audio and Visual System [for Radio and Display Type])

      • to Navigation Receiver Assembly (w/ Navigation System)

      *f
      • to Air Conditioning Amplifier Assembly (for Automatic Air Conditioning System)

      • to Air Conditioning Amplifier Assembly (for Manual Air Conditioning System [w/ PTC Heater])

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G68-3 (CANH) - G68-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Certification ECU (Smart Key ECU Assembly)*1
      G68-4 (CANH) - G68-14 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher 4 Wheel Drive Control ECU*2
      G68-5 (CANH) - G68-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω ECM
      G68-7 (CANH) - G68-17 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      • Radio and Display Receiver Assembly*3

      • Navigation Receiver Assembly*4

      G68-10 (CANH) - G68-20 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Air Conditioning Amplifier Assembly*5, *6
      *1: w/ Entry and Start System
      *2: for 4WD
      *3: w/ Audio and Visual System (for Radio and Display Type)
      *4: w/ Navigation System
      *5: for Automatic Air Conditioning System
      *6: for Manual Air Conditioning System (w/ PTC Heater)
      Result
      Result Proceed to
      OK A
      NG (to certification ECU [smart key ECU assembly] CAN branch wire) (w/ Entry and Start System) B
      NG (to 4 wheel drive control ECU CAN branch wire) (for 4WD) C
      NG (to ECM CAN main wire) (for 1TR-FE, 2TR-FE) D
      NG (to ECM CAN main wire) (for 1KD-FTV, 2KD-FTV) E
      NG (to ECM CAN main wire) (for 1GD-FTV, 2GD-FTV) F
      NG (to ECM CAN main wire) (for 5L-E) G
      NG (to radio and display receiver assembly CAN branch wire) (w/ Audio and Visual System [for Radio and Display Type]) H
      NG (to navigation receiver assembly CAN branch wire) (w/ Navigation System) I
      NG (to air conditioning amplifier assembly CAN branch wire) (for Automatic Air Conditioning System) J
      NG (to air conditioning amplifier assembly CAN branch wire) (for Manual Air Conditioning System [w/ PTC Heater]) K

    A
    C
    D
    E
    F
    G
    H
    I
    J
    K
    B
  5. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  6. CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU BRANCH WIRE)


    1. B0028MOC05
      *a

      Front view of wire harness connector

      (to Certification ECU [Smart Key ECU Assembly])

      Disconnect the certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G70-40 (CANH) - G70-18 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  7. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  8. CHECK FOR SHORT IN CAN BUS WIRES (4 WHEEL DRIVE CONTROL ECU BRANCH WIRE)


    1. B0027QNC02
      *a

      Front view of wire harness connector

      (to 4 Wheel Drive Control ECU)

      Disconnect the 4 wheel drive control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C39-20 (CANH) - C39-40 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  9. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  10. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. B0024UTC06
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G45-13 (CANH) - G45-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  11. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  12. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. B0024UTC07
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G83-24 (CANH) - G83-23 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  13. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  14. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. B0024UTC10
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G85-17 (CANH) - G85-28 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  15. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  16. CHECK FOR SHORT IN CAN BUS WIRES (ECM)


    1. B0024CTC02
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G121-25 (CANH) - G121-31 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  17. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  18. CHECK FOR SHORT IN CAN BUS WIRES (RADIO AND DISPLAY RECEIVER ASSEMBLY BRANCH WIRE)


    1. B00272FC09
      *a

      Front view of wire harness connector

      (to Radio and Display Receiver Assembly)

      Disconnect the radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G37-9 (CANH) - G37-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  19. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  20. CHECK FOR SHORT IN CAN BUS WIRES (NAVIGATION RECEIVER ASSEMBLY BRANCH WIRE)


    1. B00272FC10
      *a

      Front view of wire harness connector

      (to Navigation Receiver Assembly)

      Disconnect the navigation receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G113-9 (CANH) - G113-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  21. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  22. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)


    1. B00270CC57
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G33-11 (TX+) - G33-12 (TX-) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  23. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  24. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)


    1. B0026VUC09
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

      Disconnect the air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G77-8 (TX+) - G77-9 (TX-) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  25. CONNECT CONNECTOR


    1. Reconnect the No. 2 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  26. CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 1 CAN junction connector.

      B0028MXC71
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      *b to Brake Actuator Assembly (Skid Control ECU)
      *c to Airbag Sensor Assembly (w/ Airbag System) *d to Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor) (w/ VSC)
      *e to Combination Meter Assembly *f to No. 2 CAN Junction Connector
      *g to Headlight Leveling ECU Assembly (for LED Headlight or w/ Headlight Cleaner System) - -
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G67-1 (CANH) - G67-11 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Brake Actuator Assembly (Skid Control ECU)
      G67-2 (CANH) - G67-12 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Airbag Sensor Assembly*3
      G67-3 (CANH) - G67-13 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Spiral with Sensor Cable Sub-assembly (Steering Angle Sensor)*1
      G67-5 (CANH) - G67-15 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω Combination Meter Assembly
      G67-6 (CANH) - G67-16 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω No. 2 CAN Junction Connector
      G67-8 (CANH) - G67-18 (CANL) Cable disconnected from negative (-) battery terminal 200 Ω or higher Headlight Leveling ECU Assembly*2
      *1: w/ VSC
      *2: for LED Headlight or w/ Headlight Cleaner System
      *3: w/ Airbag System
      Result
      Result Proceed to
      OK A
      NG (to brake actuator assembly [skid Control ECU] CAN branch wire) B
      NG (to airbag sensor assembly CAN branch wire) (w/ Airbag System) C
      NG (to spiral with sensor cable sub-assembly [steering angle sensor] CAN branch wire) (w/ VSC) D
      NG (to combination meter assembly CAN main wire) E
      NG (to headlight leveling ECU assembly CAN branch wire) (for LED Headlight or w/ Headlight Cleaner System) F
      NG (to No. 2 CAN junction connector CAN main wire) G

    A
    C
    D
    E
    F
    G
    B
  27. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  28. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU BRANCH WIRE)


    1. B00283UC01
      *A w/ VSC
      *B w/o VSC
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

      Disconnect the brake actuator assembly (skid control ECU) connector.

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

      Standard Resistance
      w/ VSC
      Tester Connection Condition Specified Condition
      A4-22 (CANH) - A4-10 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      w/o VSC
      Tester Connection Condition Specified Condition
      A3-25 (CANH) - A3-14 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  29. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  30. CHECK FOR SHORT IN CAN BUS WIRES (AIRBAG SENSOR ASSEMBLY BRANCH WIRE)


    1. B0026ACC17
      *a

      Rear view of wire harness connector

      (to Airbag Sensor Assembly)

      Disconnect the airbag sensor assembly connector.

      Type A:

      Click here

      Type B:

      Click here

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G42-13 (CANH) - G42-22 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  31. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  32. CHECK FOR SHORT IN CAN BUS WIRES (STEERING ANGLE SENSOR BRANCH WIRE)


    1. B00256WC17
      *a

      Front view of wire harness connector

      (to Spiral with Sensor Cable Sub-assembly [Steering Angle Sensor])

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G21-3 (CANH) - G21-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  33. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  34. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ASSEMBLY MAIN WIRE)


    1. B0027LHC12
      *a

      Rear view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G9-36 (CANH) - G9-35 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG
  35. CONNECT CONNECTOR


    1. Reconnect the No. 1 CAN junction connector.

      Result
      Proceed to
      NEXT

    NEXT
  36. CHECK FOR SHORT IN CAN BUS WIRES (HEADLIGHT LEVELING ECU ASSEMBLY BRANCH WIRE)


    1. B0025ORC05
      *a

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)

      Disconnect the headlight leveling ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G80-6 (CANH) - G80-7 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Proceed to
      OK
      NG

    OK
    NG