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Power Steering ECU Communication Stop Mode [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 CAN BUS LINE FOR DISCONNECTION (STEERING COLUMN ASSEMBLY (POWER STEERING ECU) BRANCH WIRE) 
    1. Disconnect the steering column assembly (power steering ECU) connector.
      GTY722115Courtesy 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
      D35-2 (CANH) - D35-1 (CANL) Ignition switch off 54 to 69 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Steering Column Assembly (Power Steering ECU))

    Result: 

    NG 

    REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING COLUMN ASSEMBLY (POWER STEERING ECU) (CAN-H, CAN-L) 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (STEERING COLUMN ASSEMBLY (POWER STEERING ECU) - 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 steering column assembly (power steering ECU) connectors.
      GTY738090Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D36-2 (PGND) - 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
      D35-5 (IG) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Steering Column Assembly (Power Steering ECU))

    Result: 

    OK 

    REPLACE STEERING COLUMN ASSEMBLY (POWER STEERING ECU) 

    (Refer to REMOVAL [12/2015 - ] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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