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Home >> Toyota >> 2016 >> Highlander Limited, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> Can Communication System >> DTC U0104: Lost Communication with Driving Support ECU [12/2013 - 11/2016] >> Procedure

DTC U0104: Lost Communication with Driving Support ECU [12/2013 - 11/2016]: 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 2 malfunction. Troubleshoot for DTC U1002 and check for malfunctions in sub bus 2.

      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 

    Refer to  DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [12/2013 - 11/2015]   or  DTC U1002: Lost Communication with Gateway Module (Network Gateway ECU) [11/2015 - 11/2016]  

    Result: 

    A 

    See step  2

  2. CHECK FOR OPEN IN SUB BUS 2 LINES (DRIVING SUPPORT ECU ASSEMBLY BRANCH LINE) 
    1. Disconnect the cable from the negative (-) battery terminal.
    2. Disconnect the F84 driving support ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY426685Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F84-39 (CA2H) - F84-17 (CA2L) Cable disconnected from negative (-) battery terminal 54 to 69 Ω

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (DRIVING SUPPORT ECU ASSEMBLY) 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY426689Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F84-25 (GND) - 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.
      GTY426688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Driving Support ECU Assembly)

      Standard Voltage

      Tester Connection Condition Specified Condition
      F84-30 (B) - Body ground Ignition switch ON 11 to 14 V

    Result: 

    OK 

    REPLACE DRIVING SUPPORT ECU ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

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