CAN COMMUNICATION SYSTEM, Diagnostic DTC:U0200

DTC Code DTC Name
U0200 Lost Communication with "Door Control Module B"

DESCRIPTION

DTC No. Detection Item DTC Detection Condition Trouble Area Note
U0200 Lost Communication with "Door Control Module B" 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 ground circuit

  • Outer mirror control ECU assembly

Tech Tips

The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

Tech Tips

This diagnosis procedure is for when DTC U0200 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

WIRING DIAGRAM

B003TXSE02
B003VGOE01

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the engine 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 engine 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.

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  • 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.

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

  • DTC check procedure: Turn the engine switch on (IG) and wait at least 20 seconds.

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

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

Tech Tips


  • Operating the engine 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


    Body Electrical > Main Body > Trouble Codes
    1. Reconfirm DTCs.

      Tech Tips

      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 sub bus 1.

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

    B
    A
  2. CHECK FOR OPEN IN SUB BUS 1 LINES (OUTER MIRROR CONTROL ECU ASSEMBLY BRANCH LINE)


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

    2. B003WP3C13
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly)

      Disconnect the N24 outer mirror control ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N24-9 (CANP) - N24-8 (CANN) Cable disconnected from negative (-) battery terminal 54 to 69 Ω
      Result
      Result
      OK
      NG

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)


    1. B003WP3C14
      *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
      N24-7 (GND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    2. Reconnect the cable to the negative (-) battery terminal.

    3. B003WP3C15
      *a

      Front view of wire harness connector

      (to Outer Mirror Control ECU Assembly)

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      N24-5 (SIG) - Body ground Engine switch on (IG) 11 to 14 V
      N24-6 (CPUB) - Body ground Always 11 to 14 V
      N24-14 (BDR) - Body ground Always 11 to 14 V
      Result
      Result
      OK
      NG

    OK
    NG