CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0199

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

DESCRIPTION

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

  • Outer mirror control ECU assembly branch line or connector

  • Power source circuit of outer mirror control ECU assembly

  • Outer mirror control ECU assembly (Front passenger side) (for LHD)

  • Outer mirror control ECU assembly (Driver side) (for RHD)

Tech Tips

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

WIRING DIAGRAM

A003VB2E03
A003VB2E07

INSPECTION PROCEDURE

Note


  • Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.

  • Turn the power switch off before inspecting CAN bus lines for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

Tech Tips


  • 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.

PROCEDURE


  1. RECONFIRM DTC OUTPUT


    1. Reconfirm DTCs.

      Tech Tips

      If DTC U1002 is output from Main Body of the main body ECU, this indicates a MS bus malfunction. Troubleshoot for DTC U1002 and check for malfunctions in the MS bus.

      Result
      Result Proceed to
      U1002 is not output from main body ECU (Intelligent tester display/Main Body) A
      U1002 is output from main body ECU (Intelligent tester display/Main Body) B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC Click here

    A

  2. CHECK CAN BUS LINE FOR DISCONNECTION (OUTER MIRROR CONTROL ECU ASSEMBLY BRANCH LINE)


    1. Turn the power switch off.

    2. A003WAZE44
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly)

      Disconnect the outer mirror control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      J8-9 (CANP) - J8-8 (CANN) Power switch off 54 to 69 Ω

    NG

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

    OK

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. A003WAZE45
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J8-7 (GND) - Body ground Always Below 1 Ω

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J8-6 (CPUB) - Body ground Power switch off 11 to 14 V
      J8-5 (SIG) - Body ground Power switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)

    OK

    REPLACE OUTER MIRROR CONTROL ECU ASSEMBLY Click here