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Home >> Toyota >> 2019 >> Sienna SE, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can Communication System - Diagnostic Codes (2 Of 2) & Circuit Tests (1 Of 3) >> Can Communication System >> Diagnostic Codes >> DTC U1110: Lost Communication with Clearance Sonar Module [12/2015 - 11/2017] >> Procedure

DTC U1110: Lost Communication with Clearance Sonar Module [12/2015 - 11/2017]: Procedure

  1. PRECAUTION 
    NOTE:

    After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Refer to PRECAUTION [12/2015 - 08/2016] , or refer to PRECAUTION [08/2016 - ] ).

    Result: 

    NEXT 

    See step  2

  2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL 
    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [12/2015 - 08/2016] , or refer to INITIALIZATION [08/2016 - 11/2017] )

    Result: 

    NEXT 

    See step  3

  3. CHECK FOR OPEN IN CAN BUS WIRE (CLEARANCE WARNING ECU ASSEMBLY BRANCH WIRE) 
    1. Disconnect the clearance warning ECU assembly connector.
      GTY728871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      D77-3 (R1) - D77-5 (R2) Ignition switch off 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Clearance Warning ECU Assembly)

    Result: 

    NG 

    REPAIR OR REPLACE CLEARANCE WARNING ECU ASSEMBLY BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L) 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY - POWER SOURCE) 
    1. Connect the cable to the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [12/2015 - 08/2016] , or refer to INITIALIZATION [08/2016 - 11/2017] )

    2. Disconnect the clearance warning ECU assembly connector.
    3. Measure the resistance according to the value(s) in the table below.
      GTY690163Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard Resistance

      Tester Connection Condition Specified Condition
      D77-17 (E) - Body ground Always Below 1 Ω
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D77-15 (IG) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Clearance Warning ECU Assembly)

    Result: 

    OK 

    REPLACE CLEARANCE WARNING ECU ASSEMBLY 

    (Refer to REMOVAL [12/2015 - 11/2017] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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