CAN COMMUNICATION SYSTEM(for LHD with Entry and Start System) 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.

    Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "DCM Communication Stop Mode" in "DTC Combination Table".

    Click here


  • Telematics transceiver CAN branch wire or connector

  • Power source circuit of telematics transceiver

  • Telematics transceiver ground circuit

  • Telematics transceiver

WIRING DIAGRAM

A01XE43E48

CAUTION / NOTICE / HINT

Note

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

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. 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 airbag system.

      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

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

        Click here


    NEXT

  2. CHECK FOR OPEN IN CAN BUS WIRE (TELEMATICS TRANSCEIVER CAN BRANCH WIRE)


    1. B001F9TE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

      Disconnect the G187 telematics transceiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G187-15 (CANP) - G187-16 (CANN) Engine switch off 54 to 69 Ω

    NG

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

    OK

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


    1. A01XM7SE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

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

      Note

      When connecting 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
      G187-4 (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
      G187-1 (+B) - Body ground Always 11 to 14 V
      G187-7 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      G187-8 (ACC) - Body ground Engine switch on (ACC) 11 to 14 V

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR