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DTC B2782: Power Source Control ECU Malfunction [08/2015 - 08/2019]: Procedure

  1. INSPECT STEERING LOCK ECU 
    1. Disconnect the G23 steering lock ECU connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G23-1 (GND) - Body ground Always Below 1 Ω
    3. Reconnect the G23 steering lock ECU connector.
    4. Turn the engine switch off, make sure that the steering is unlocked and move the shift lever to P.
    5. Check the signal waveform according to the condition(s) in the table below.
      GTY681367Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *a Component with harness connected
      (Steering Lock ECU)
      *b Steering lock motor not operating
      *c Steering lock motor operating
      STANDARD FREQUENCY

      Item Content
      Tester Connection G23-3 (IGE) - G23-1 (GND)
      Tool Setting 2 V/DIV., 200 ms./DIV.
      Vehicle Condition Steering lock motor not operating → Steering lock motor operating → Steering lock motor not operating

      HINT: 

      • When taking measurements when the lock motor is stopped, it is not necessary to perform any operations.
      • In order to take measurements when the lock motor is operating, perform either of the following operations:
        • To unlock the steering, carry the key and turn the engine switch on (ACC) or on (IG) while the shift lever is in P.
        • To lock the steering, turn the engine switch off with the shift lever in P, and then open a door.

    Result: 

    NG 

    See step  4

    Result: 

    OK 

    See step  2

  2. CLEAR DTC AND DATA LIST MALFUNCTION RECORD 
    1. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    2. Disconnect the cable from the negative (-) battery terminal, wait for 30 seconds or more, and then reconnect the cable to the negative (-) battery terminal to clear the record of malfunctions stored in Power Supply Open in the Data List.
      NOTE:
      • w/ Navigation System:

        After the engine switch is turned off, the display and navigation module display (navigation system) records various types of memory and settings. As a result, after turning the engine switch off, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

        Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal

        Condition Waiting Time
        Vehicle enrolled in safety connect system 6 minutes
        Vehicle not enrolled in safety connect system 1 minute
      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Refer to INITIALIZATION [08/2015 - 08/2019] ).

    Result: 

    NEXT 

    See step  3

  3. READ VALUE USING TECHSTREAM (POWER SUPPLY OPEN) 
    1. Perform the DTC output confirmation operation.
    2. Check if DTC B2782 is output (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    3. Use the Data List to check if the steering lock control is functioning properly.
      SMART ACCESS

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Supply Open Record of malfunction of signal sent to steering lock actuator assembly (motor) from power management control ECU (open circuit) (DTC B2782 stored)/OK or NG(Past) OK: No record of malfunction (open circuit)
      NG(Past): Record of malfunction (open circuit) exists      		 This item records malfunctions in the circuit between the power management control ECU and steering lock actuator assembly (motor).
      RESULT

      Result Proceed to
      • B2782 is not output
      • "OK" is displayed on the Techstream.
      		 A
      • B2782 is output
      • "NG(Past)" is displayed on the Techstream.
      		 B

    Result: 

    A 

    SYSTEM RETURNED TO NORMAL (DTC STORED DUE TO BAD CONNECTION, BUT SYSTEM RETURNED TO NORMAL BY RECONNECTING CONNECTOR) 

    Result: 

    B 

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) 

    (Refer to DISASSEMBLY [08/2015 - 08/2019] )

  4. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU - STEERING LOCK ECU) 
    1. Disconnect the G39 power management control ECU connector.
    2. Disconnect the G23 steering lock ECU connector.
    3. Check for deformation and corrosion of the connector case and terminals.

      OK

      There is no deformation or corrosion of the connector case or terminals.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G39-8 (SLR+) - G23-3 (IGE) Always Below 1 Ω
      G39-8 (SLR+) or G23-3 (IGE) - Body ground Always 10 kΩ or higher

    Result: 

    OK 

    REPLACE POWER MANAGEMENT CONTROL ECU 

    (Refer to REMOVAL [08/2015 - 08/2019] )

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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