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

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

  • Hybrid vehicle control ECU

  • Skid control ECU assembly

  • Main body ECU (driver side junction block)

  • No. 1 meter ECU sub-assembly

  • Multi-media module receiver assembly

  • Air conditioning amplifier assembly

  • Headlight swivel ECU assembly

  • Telematics transceiver*

  • Center airbag sensor assembly

  • No. 1 junction connector

  • No. 2 junction connector

  • No. 3 junction connector

*: w/ Telematics Transceiver

WIRING DIAGRAM

A01GYU9E02
A01GWMJE01

INSPECTION PROCEDURE

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 power 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 power switch off, waiting time may be required before disconnecting the cable from the auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the auxiliary battery terminal notice before proceeding with work Click here.


    NEXT

  2. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) auxiliary 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 (-) auxiliary 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 GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - DLC3)


    1. A01GXEKE21
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L31-14 (CANL) - L31-4 (CG) Power switch off 200 Ω 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 GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    1. A01GXEKE21
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L31-14 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GWS9E62
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      A67-21 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GY1LE05
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      A67-20 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 1 JUNCTION CONNECTOR

  8. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

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


    1. A01H0EHE03
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      A21-8 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE SKID CONTROL ECU ASSEMBLY Click here

  10. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

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


    1. A01GX8PE05
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      A13-13 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE ECM Click here

  12. CONNECT CONNECTOR


    1. Reconnect the A13 ECM connector.


    NEXT

  13. CHECK FOR SHORT TO GND IN CAN BUS WIRE (HYBRID VEHICLE CONTROL ECU - ECM)


    1. A01GX8PE14
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)
      *b Front view of DLC3

      Disconnect the hybrid vehicle control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A76-13 (CA3H) - L31-4 (CG) Power switch off 200 Ω or higher
      A76-14 (CA3L) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - ECM)

    OK

  14. CHECK FOR SHORT TO GND IN CAN BUS WIRE (HYBRID VEHICLE CONTROL ECU - NO. 1 JUNCTION CONNECTOR)


    1. A01GX8PE15
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Hybrid Vehicle Control ECU)
      *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
      A76-15 (CANH) - L31-4 (CG) Power switch off 200 Ω or higher
      A76-16 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - NO. 1 JUNCTION CONNECTOR)

    OK

    REPLACE HYBRID VEHICLE CONTROL ECU Click here

  15. CONNECT CONNECTOR


    1. Reconnect the A67 No. 1 junction connector.


    NEXT

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


    1. A01GWS9E64
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L97-15 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

  17. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

  18. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR SIDE)


    1. A01GXEKE21
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L31-14 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

  19. CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - TELEMATICS TRANSCEIVER)

    Note

    For vehicles without a telematics transceiver, go to "Check for Short in CAN Bus Wires (No. 3 Junction Connector - Multi-media Module Receiver Assembly)".


    1. A01GWKRE08
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L98-17 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GWS9E66
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L98-20 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GWS9E67
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L98-21 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GWS9E68
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L98-22 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GWS9E69
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L98-19 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 3 JUNCTION CONNECTOR

  24. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

  25. CHECK FOR SHORT TO GND IN CAN BUS WIRE (TELEMATICS TRANSCEIVER)


    1. A01GZINE10
      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
      L191-15 (CANP) - L31-4 (CG) Power switch off 200 Ω or higher
      L191-16 (CANN) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here

  26. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

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


    1. A01GWSOE14
      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
      L164-1 (CANH) - L31-4 (CG) Power switch off 200 Ω or higher
      L164-2 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MULTI-MEDIA MODULE RECEIVER ASSEMBLY (CANH, CANL)

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

  28. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

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


    1. A01GX8PE06
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L77-4 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  30. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

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


    1. A01GXNDE05
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      A37-13 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE HEADLIGHT SWIVEL ECU ASSEMBLY Click here

  32. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

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


    1. A01GX60E18
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L73-22 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  34. CONNECT CONNECTOR


    1. Reconnect the L98 No. 3 junction connector.


    NEXT

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


    1. A01GWS9E70
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L97-12 (CANL) - L31-4 (CG) Power switch off 200 Ω 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 GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - MAIN BODY ECU)


    1. A01GWS9E71
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L97-14 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

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


    1. A01GWS9E72
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L97-16 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

    CONNECT CONNECTOR Click here

    OK

    REPLACE NO. 2 JUNCTION CONNECTOR

  38. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

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


    1. A01GZ67E03
      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) - L31-4 (CG) Power switch off 200 Ω or higher
      L11-6 (CANL) - L31-4 (CG) Power 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 (DRIVER SIDE JUNCTION BLOCK)

  40. CONNECT CONNECTOR


    1. Reconnect the L97 No. 2 junction connector.


    NEXT

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


    1. A01H0RTE09
      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
      L124-20 (CANH) - L31-4 (CG) Power switch off 200 Ω or higher
      L124-21 (CANL) - L31-4 (CG) Power switch off 200 Ω or higher

    NG

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

    OK

    REPLACE NO. 1 METER ECU SUB-ASSEMBLY Click here