CAN COMMUNICATION SYSTEM (for LHD), Diagnostic DTC:U0199

DTC Code DTC Name
U0199 Lost Communication with "Door Control Module A"

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
U0199 There is no communication from the front multiplex network door ECU RH.

  • Power source or inside of front multiplex network door ECU RH

  • Front multiplex network door ECU RH CAN branch wire or connector

  • Front multiplex network door ECU RH

WIRING DIAGRAM

A01FV53E13

INSPECTION PROCEDURE

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 power 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 (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • 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.

  • 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 power switch on (IG) and wait at least 20 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.

Tech Tips


  • Operating the power 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. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If DTC U1002 is output from Gateway of the main body ECU (multiplex network body ECU), this indicates a sub bus 1 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 1.

      Result
      Result Proceed to
      DTC U1002 is not output from main body ECU (multiplex network body ECU). A
      DTC U1002 is output from main body ECU (multiplex network body ECU). B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (FRONT MULTIPLEX NETWORK DOOR ECU RH CAN BRANCH WIRE)


    1. A01FQHYE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Front Multiplex Network Door ECU RH)

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

    2. Disconnect the front multiplex network door ECU RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q4-8 (CANP) - Q4-7 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

    NG

    REPAIR OR REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH CAN BRANCH WIRE OR CONNECTOR (CANP, CANN)

    OK

  3. CHECK HARNESS AND CONNECTOR (FRONT MULTIPLEX NETWORK DOOR ECU RH - BATTERY AND BODY GROUND)


    1. A01FQHYE04
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Front Multiplex Network Door ECU RH)

      Connect the cable to the negative (-) auxiliary 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
      Q4-4 (CPUB) - Body ground Always 11 to 14 V
      Q4-6 (BDR) - Body ground Always 11 to 14 V
      Q4-3 (SIG) - Body ground Power switch on (IG) 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q4-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE FRONT MULTIPLEX NETWORK DOOR ECU RH Click here