CAN COMMUNICATION SYSTEM(for LHD) Short to B+ in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus lines and +B when the resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3 is below 6 kΩ.

Symptom Trouble Area
The resistance between terminals 6 (CANH) and 16 (BAT) or terminals 14 (CANL) and 16 (BAT) of the DLC3 is below 6 kΩ.

  • Short between CAN bus lines and +B

  • ECM

  • Skid control ECU assembly

  • Main body ECU (driver side junction block)

  • No. 1 meter ECU sub-assembly

  • Telematics transceiver*

  • Electric power control ECU (passenger side junction block)

  • Multi-media module receiver assembly

  • Air conditioning amplifier assembly

  • Headlight swivel ECU assembly

  • Center airbag sensor assembly

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

*: w/ Telematics Transceiver

WIRING DIAGRAM

A001E6EE01
A001CLFE01

CAUTION / NOTICE / HINT

Note

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 Click here.

Tech Tips

Operating the engine 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 engine 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:

      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 B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - DLC3)


    1. A001DJDE03
      Text in Illustration
      *a Front view of DLC3

      Disconnect the L97 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
      L31-6 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L31-14 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

  4. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

  5. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    1. A001DJDE03
      Text in Illustration
      *a Front view of DLC3

      Disconnect the A67 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
      L31-6 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L31-14 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  6. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU ASSEMBLY)


    1. A001AHME01
      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
      A67-10 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A67-21 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  7. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)


    1. A001BIOE01
      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
      A67-9 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A67-20 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  8. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

  9. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (SKID CONTROL ECU ASSEMBLY)


    1. A001CLAE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU Assembly)
      *b Front view of DLC3

      Disconnect the skid control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A21-9 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A21-8 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

    NG

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

  10. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

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


    1. A001AJFE02
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to ECM)
      *b Front view of DLC3

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A13-14 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A13-13 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      Result
      Result Proceed to
      OK (for 1UR-FSE) A
      OK (for 1UR-FE) B
      NG C

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

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

  12. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

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


    1. A001D5YE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the 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
      L97-4 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L97-15 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

  14. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

  15. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR SIDE)


    1. A001DJDE03
      Text in Illustration
      *a Front view of DLC3

      Disconnect the L98 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
      L31-6 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L31-14 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  16. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - TELEMATICS TRANSCEIVER)

    Note

    For vehicles without a telematics transceiver, go to "Check for Short to B+ in CAN Bus Wire (No. 3 Junction Connector - Electric Power Control ECU)".


    1. A001FJZE02
      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
      L98-5 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L98-16 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  17. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - ELECTRIC POWER CONTROL ECU)


    1. A001CFJE01
      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
      L98-6 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L98-17 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  18. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A001DS2E01
      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
      L98-9 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L98-20 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  19. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A001DASE01
      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
      L98-10 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L98-21 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  20. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - HEADLIGHT SWIVEL ECU ASSEMBLY)


    1. A001CX4E01
      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
      L98-11 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L98-22 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  21. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - CENTER AIRBAG SENSOR ASSEMBLY)


    1. A001EBCE01
      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
      L98-8 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L98-19 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  22. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  23. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (TELEMATICS TRANSCEIVER)


    1. A001AQXE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)
      *b Front view of DLC3

      Disconnect the telematics transceiver connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L181-15 (CANP) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L181-16 (CANN) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here

    NG

    REPAIR OR REPLACE REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO TELEMATICS TRANSCEIVER (CANP, CANN)

  24. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  25. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (ELECTRIC POWER CONTROL ECU)


    1. A001DFZE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Electric Power Control ECU [Passenger Side Junction Block])
      *b Front view of DLC3

      Disconnect the electric power control ECU (passenger side junction block) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A69-15 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A69-14 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE ELECTRIC POWER CONTROL ECU (PASSENGER SIDE JUNCTION BLOCK)

    NG

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

  26. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  27. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY)


    1. A001F64E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)
      *b Front view of DLC3

      Disconnect the 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
      L146-1 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L146-2 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ 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)

  28. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  29. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. A001CY4E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Air Conditioning Amplifier Assembly)
      *b Front view of DLC3

      Disconnect the air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L77-3 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L77-4 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ 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)

  30. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  31. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (HEADLIGHT SWIVEL ECU ASSEMBLY)


    1. A001AC4E01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Headlight Swivel ECU Assembly)
      *b Front view of DLC3

      Disconnect the 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
      A37-12 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      A37-13 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO HEADLIGHT SWIVEL ECU ASSEMBLY (CANH, CANL)

  32. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  33. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (CENTER AIRBAG SENSOR ASSEMBLY)


    1. A001D4EE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *b Front view of DLC3

      Disconnect the 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
      L73-13 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L73-22 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

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

  34. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  35. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)


    1. A001CUGE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to No. 2 Junction Connector)
      *b Front view of DLC3

      Disconnect the 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
      L97-1 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L97-12 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

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

    OK

  36. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A00194WE01
      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
      L97-3 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L97-14 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  37. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 1 METER ECU SUB-ASSEMBLY)


    1. A001CW9E01
      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
      L97-5 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L97-16 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

    NG

    CONNECT CONNECTOR Click here

  38. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

  39. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (MAIN BODY ECU)


    1. A001DIFE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Main Body ECU [Driver Side Junction Block])
      *b Front view of DLC3

      Disconnect the main body ECU (driver side junction block) connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L11-5 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L11-6 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE MAIN BODY ECU (DRIVER SIDE JUNCTION BLOCK)

    NG

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

  40. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

  41. CHECK FOR SHORT TO B+ IN CAN BUS WIRE (NO. 1 METER ECU SUB-ASSEMBLY)


    1. A001FSXE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 1 Meter ECU Sub-assembly)
      *b Front view of DLC3

      Disconnect the No. 1 meter ECU sub-assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      L10-20 (CANH) - L31-16 (BAT) Engine switch off 6 kΩ or higher
      L10-21 (CANL) - L31-16 (BAT) Engine switch off 6 kΩ or higher

    OK

    REPLACE NO. 1 METER ECU SUB-ASSEMBLY Click here

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NO. 1 METER ECU SUB-ASSEMBLY (CANH, CANL)