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

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

  • Combination meter assembly

  • Airbag sensor assembly

  • Skid control ECU (brake actuator assembly)

  • Main body ECU (multiplex network body ECU)

  • Power steering ECU assembly

  • Certification ECU (smart key ECU assembly)*1

  • Steering angle sensor (spiral cable sub-assembly)*2

  • Radio receiver assembly*3

  • Air conditioning amplifier assembly*4

  • No. 1 junction connector

  • No. 2 junction connector

WIRING DIAGRAM

A005KBIE03
A005KPAE05

CAUTION / NOTICE / HINT

Note


  • Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.

  • After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.

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. CHECK SHORT TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)


    1. Turn the ignition switch off.

    2. Disconnect the F83 No. 2 junction connector.

    3. A005IGSE01
      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
      F4-6 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F4-14 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (DLC3 BRANCH WIRE)

    OK

  2. CONNECT CONNECTOR


    1. Reconnect the F83 No. 2 junction connector.


    NEXT

  3. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR)


    1. Disconnect the A61 and F82 No. 1 junction connectors.

    2. A005IGSE01
      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
      F4-6 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F4-14 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

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


    1. A005L4VE02
      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
      A61-9 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      A61-20 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  5. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY)


    1. A005LWKE02
      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
      A61-10 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      A61-21 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE) Click here

    OK

  6. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

    Tech Tips

    For vehicles without entry and start system, go to step 7.


    1. A005M2TE02
      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
      F82-3 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F82-14 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH WIRE) Click here

    OK

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


    1. A005KPLE02
      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
      F82-1 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F82-12 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE) Click here

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


    1. Disconnect the F83 No. 2 junction connector.

    2. A005IM0E02
      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
      F82-4 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F82-15 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  9. CONNECT CONNECTOR


    1. Reconnect the A61 and F82 No. 1 junction connectors.


    NEXT

  10. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER ASSEMBLY)


    1. A005HW1E02
      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
      F83-7 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-18 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (COMBINATION METER ASSEMBLY MAIN WIRE) Click here

    OK

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

    Tech Tips

    For vehicles without Air Conditioning System or electrical type power heater system, go to step 12.


    1. A005H8ME02
      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
      F83-8 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-19 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

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

    OK

  12. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY))

    Tech Tips

    For vehicles without VSC, go to step 13.


    1. A005HRNE02
      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
      F83-1 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-12 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE) Click here

    OK

  13. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - POWER STEERING ECU ASSEMBLY)


    1. A005I01E02
      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
      F83-6 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-17 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY) Click here

    OK

  14. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - RADIO RECEIVER ASSEMBLY)

    Tech Tips

    For vehicles without radio and display system, go to step 15.


    1. A005K06E02
      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
      F83-5 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-16 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    NG

    CHECK SHORT TO GND IN CAN BUS WIRE (RADIO RECEIVER ASSEMBLY BRANCH WIRE) Click here

    OK

  15. CHECK SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - AIRBAG SENSOR ASSEMBLY)


    1. A005JQRE02
      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
      F83-4 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-15 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

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

  16. CHECK SHORT TO GND IN CAN BUS WIRE (ECM MAIN WIRE)


    1. Disconnect the A58 ECM connector.

    2. A005L4VE02
      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
      A61-9 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      A61-20 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher
      Result
      Result Proceed to
      NG A
      OK (for 1NR-FE) B
      OK (for 1NZ-FE) C

    A

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (ECM MAIN WIRE)

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

  17. CHECK SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)


    1. Disconnect the A54*1 or A55*2 skid control ECU (brake actuator assembly) connector.

      *1 : w/ VSC

      *2 : w/o VSC

    2. A005LWKE02
      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
      A61-10 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      A61-21 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (SKID CONTROL ECU (BRAKE ACTUATOR ASSEMBLY) BRANCH WIRE)

  18. CHECK SHORT TO GND IN CAN BUS WIRE (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH WIRE)


    1. Disconnect the F63 certification ECU (smart key ECU assembly) connector.

    2. A005M2TE02
      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
      F82-3 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F82-14 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) BRANCH WIRE)

  19. CHECK SHORT TO GND IN CAN BUS WIRE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)


    1. Disconnect the F76 main body ECU (multiplex network body ECU) connector.

    2. A005KPLE02
      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
      F82-1 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F82-12 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

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

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) BRANCH WIRE)

  20. CHECK SHORT TO GND IN CAN BUS WIRE (COMBINATION METER ASSEMBLY MAIN WIRE)


    1. Disconnect the F1 combination meter assembly connector.

    2. A005HW1E02
      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
      F83-7 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-18 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (COMBINATION METER ASSEMBLY MAIN WIRE)

  21. CHECK SHORT TO GND IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)


    1. Disconnect the F42*1 or F41*2 air conditioning amplifier assembly connector.

      *1 : w/ Automatic Air Conditioning System

      *2 : w/ Manual Air Conditioning System or Electrical Type Power Heater System

    2. A005H8ME02
      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
      F83-8 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-19 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY BRANCH WIRE)

  22. CHECK SHORT TO GND IN CAN BUS WIRE (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)


    1. Disconnect the F30 steering angle sensor (spiral cable sub-assembly) connector.

    2. A005HRNE02
      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
      F83-1 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-12 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (STEERING ANGLE SENSOR (SPIRAL CABLE SUB-ASSEMBLY) BRANCH WIRE)

  23. CHECK SHORT TO GND IN CAN BUS WIRE (POWER STEERING ECU ASSEMBLY)


    1. Disconnect the F6 power steering ECU assembly connector.

    2. A005I01E02
      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
      F83-6 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-17 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (POWER STEERING ECU ASSEMBLY BRANCH WIRE)

  24. CHECK SHORT TO GND IN CAN BUS WIRE (RADIO RECEIVER ASSEMBLY BRANCH WIRE)


    1. Disconnect the F47 radio receiver assembly connector.

    2. A005K06E02
      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
      F83-5 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-16 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (RADIO RECEIVER ASSEMBLY BRANCH WIRE)

  25. CHECK SHORT TO GND IN CAN BUS WIRE (AIRBAG SENSOR ASSEMBLY BRANCH WIRE)


    1. Disconnect the F16 airbag sensor assembly connector.

    2. A005JQRE02
      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
      F83-4 (CANH) - F4-4 (CG) Ignition switch off 200 Ω or higher
      F83-15 (CANL) - F4-4 (CG) Ignition switch off 200 Ω or higher

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BUS BRANCH WIRE OR CONNECTOR (AIRBAG SENSOR ASSEMBLY BRANCH WIRE)