CAN COMMUNICATION SYSTEM(for LHD with Central Gateway ECU) Multi-media Module Receiver Assembly Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
Multi-media Module Receiver Assembly Communication Stop Mode

Either Condition is met:


  • Communication stop for "Display and Navigation (AVN1)" is indicated on the "Communication Bus Check" screen of the GTS Click here.

  • Communication system DTCs (DTCs that start with U) that are output correspond to "Multi-media Module Receiver Assembly Communication Stop Mode" in "DTC Combination Table" Click here.

  • Multi-media module receiver assembly CAN branch wire or connector

  • Power source circuit of multi-media module receiver assembly

  • Multi-media module receiver assembly ground circuit

  • Multi-media module receiver assembly

WIRING DIAGRAM

B001VVFE03

CAUTION / NOTICE / HINT

Note


  • 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.

  • 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, 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 battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

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

  • 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 turn the blind spot monitor main switch to ON, and then wait 13.6 seconds or more.

  • 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.

Tech Tips


  • Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

  • 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 WIRE (MULTI-MEDIA MODULE RECEIVER ASSEMBLY CAN BRANCH WIRE)


    1. B001WU3E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)

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

    2. Disconnect the multi-media module receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F77-1 (CANH) - F77-2 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    NG

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

    OK

  2. CHECK HARNESS AND CONNECTOR (MULTI-MEDIA MODULE RECEIVER ASSEMBLY - BATTERY AND BODY GROUND)


    1. B001Z4GE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Multi-media Module Receiver Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F77-17 (+B1) - Body ground Always 11 to 14 V
      F77-16 (ACC1) - Body ground Ignition switch ACC 11 to 14 V
      F77-15 (IG) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F77-12 (GND1) - Body ground Always Below 1 Ω

    OK

    REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR