CAN COMMUNICATION SYSTEM(for LHD) DCM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
DCM Communication Stop Mode

Either condition is met:


  • "DCM" is not displayed on the "Bus Check" screen.

  • "DCM Communication Stop Mode" in "DTC Communication Table" applies.

  • Power source circuit of telematics transceiver

  • Telematics transceiver ground circuit

  • Telematics transceiver CAN branch wire or connector

  • Telematics transceiver)

WIRING DIAGRAM

A000TOTE09

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

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 OPEN IN CAN BUS WIRE (TELEMATICS TRANSCEIVER CAN BRANCH WIRE)


    1. A000X66E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

      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) - L191-16 (CANN) Power switch off 54 to 69 Ω

    NG

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

    OK

  4. CHECK HARNESS AND CONNECTOR (TELEMATICS TRANSCEIVER - BATTERY AND BODY GROUND)


    1. A000ZB0E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

      Connect the cable to the negative (-) auxiliary battery terminal.

      Note

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L191-4 (E) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L191-1 (+B) - Body ground Always 11 to 14 V
      L191-7 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      L191-8 (ACC) - Body ground Power switch on (ACC) 11 to 14 V

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR