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CAN COMMUNICATION SYSTEM(w/o Central Gateway ECU), Diagnostic DTC:U0199

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

DTC No. DTC Detection Condition Trouble Area
U0199 No communication from the outer mirror control ECU assembly RH continues.

  • Outer mirror control ECU assembly RH branch line or connector

  • Power source circuit of outer mirror control ECU assembly RH

  • Outer mirror control ECU assembly RH ground circuit

  • Outer mirror control ECU assembly RH
Tip:

This diagnosis procedure is for when DTC U0199 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • 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 negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary 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 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).

Tip:

  • Operating the power 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.

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PROCEDURE


  1. Click here

    RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tip:

      If DTC U1002 is output from Main Body 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 the sub bus 1.

      Result
      Result Proceed to
      U1002 is not output from main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      U1002 is output from main body ECU (multiplex network body ECU) (GTS display: Main Body) B

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    CHECK FOR OPEN IN SUB BUS 1 LINES (OUTER MIRROR CONTROL ECU ASSEMBLY RH BRANCH LINE)


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

    2. A0006S0E03

      Disconnect the L10 outer mirror control ECU assembly RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L10-9 (CANP) - L10-8 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly RH)

    • OKClick here
    • NG

      REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (OUTER MIRROR CONTROL ECU ASSEMBLY RH)

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    CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A0007LPE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L10-7 (GND) - Body ground Cable disconnected from negative (-) auxiliary battery terminal Below 1 Ω
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly RH)

    2. Reconnect the cable to the negative (-) auxiliary battery terminal.

    3. A0005CDE01

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L10-6 (CPUB) - Body ground Power switch off 11 to 14 V
      L10-5 (SIG) - Body ground Power switch on (IG) 11 to 14 V
      Table 3. Text in Illustration
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly RH)

    • OK

      REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY RH (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)