CAN COMMUNICATION 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 CAN Bus Check screen of the GTS Click here

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


  • Telematics transceiver branch line or connector

  • Power source circuit of telematics transceiver

  • Telematics transceiver ground circuit

  • Telematics transceiver

WIRING DIAGRAM

B000J9KE01

INSPECTION PROCEDURE

Note


  • Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work Click here.

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output Click here.

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the ignition switch to ON and wait at least 25 seconds.

  • After the repair, perform CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed Click here.

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

Tech Tips


  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK FOR OPEN IN CAN BUS LINES (TELEMATICS TRANSCEIVER BRANCH LINE)


    1. Disconnect the cable from the negative (-) battery terminal.

    2. B000MNJE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

      Disconnect the I218 telematics transceiver.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I218-15 (CANP) - I218-16 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (TELEMATICS TRANSCEIVER)

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B000MNJE04
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I218-4 (E) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω

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

    3. B000MNJE05
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telematics Transceiver)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      I218-1 (+B) - Body ground Ignition switch off 11 to 14 V
      I218-8 (ACC) - Body ground Ignition switch ACC 11 to 14 V
      I218-7 (IG2) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE TELEMATICS TRANSCEIVER Click here