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DTC U0134: Lost Communication with DRS Module [09/2014 - 11/2017]: Procedure

  1. RECONFIRM DTC OUTPUT 

    Body Electrical > Gateway > Trouble Codes 

    1. Reconfirm DTCs.

      HINT: 

      If DTC U1002 is output from Gateway of the network gateway ECU, this indicates a sub bus 19 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 19.

      Result

      Result Proceed to
      DTC U1002 is not output from network gateway ECU (Techstream display: Gateway) A
      DTC U1002 is output from network gateway ECU (Techstream display: Gateway) B

    Result: 

    B 

    GO TO DIAGNOSTIC PROCEDURE INDICATED BY OUTPUT DTC. Refer to  DTC U1002: Lost Communication with Gateway Module [09/2014 - 11/2017] 

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN SUB BUS 19 LINES (REAR STEERING CONTROL ECU BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the U1 rear steering control ECU connector.
      GTY502250Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Steering Control ECU)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      U1-2 (CANH) - U1-3 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

      Result

      Result
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINES OR CONNECTOR (REAR STEERING CONTROL ECU) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY502245Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Steering Control ECU)

      Standard Resistance

      Tester Connection Condition Specified Condition
      U1-5 (GNDY) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
    2. Reconnect the cable to the negative (-) battery terminal.
    3. Measure the voltage according to the value(s) in the table below.
      GTY502246Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Steering Control ECU)

      Standard Voltage

      Tester Connection Condition Specified Condition
      U1-4 (PIG) - Body ground Always 11 to 14 V
      U1-9 (IGY) - Body ground Engine switch on (IG) 11 to 14 V

      Result

      Result
      OK
      NG

    Result: 

    OK 

    REPLACE REAR STEERING CONTROL ECU. Refer to  REMOVAL [09/2014 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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