STEERING LOCK SYSTEM, Diagnostic DTC:B2782

DTC Code DTC Name
B2782 Power Source Control ECU Malfunction

DESCRIPTION


The diagnosis information of the steering lock ECU is transmitted to the intelligent tester via the certification ECU as the steering lock actuator assembly (steering lock ECU) is not connected to the CAN communication system.

DTC Code Detection Condition Trouble Area
B2782 An IGE power supply circuit malfunction.

  • Steering lock actuator assembly (steering lock ECU)

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A01IQODE04

INSPECTION PROCEDURE

Tech Tips

When the engine switch is off, the main body ECU may occasionally go into a non-active state called sleep mode. Therefore, before proceeding with the inspection, it is necessary to perform the following steps to wake up the ECU:

With the engine switch off, open the driver door. Then (with the engine switch still off) open and close any door several times at 1.5 second intervals.

Note


  • When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected Click here.

  • If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (except Manual Transaxle), open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.

  • When replacing the steering lock ECU, registration must be performed. Refer to the Service Bulletin for the registration procedure.

PROCEDURE


  1. INSPECT STEERING LOCK ECU


    1. A01ISD4E05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Steering Lock ECU)

      Disconnect the H54 steering lock ECU connector.

    2. Turn the engine switch off, make sure that the steering lock is unlocked and move the shift lever to P*.


      • *: except Manual Transaxle

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-1 (GND) - Body ground Always Below 1 Ω
    4. A01ISUCE09
      Text in Illustration
      *1

      Component with harness connected

      (Steering Lock ECU)

      Reconnect the H54 steering lock ECU connector.

    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      H54-3 (IGE) - H54-1 (GND) Driver side door opened Below 1 V (Steering lock motor operating)
      H54-3 (IGE) - H54-1 (GND) Driver side door opened 11 to 14 V (Steering lock motor not operating)

      Tech Tips

      When the steering lock is locked and the engine is switch is turned on (IG), the steering lock motor activates to release the steering lock. The motor operates for 2 to 15 seconds.


    NG

    CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU) Click here

    OK

  2. CLEAR DTC


    1. Clear the DTCs Click here.

    2. Disconnect and reconnect the cable to the negative (-) battery terminal to clear the malfunction history of Power Supply Open.


    NEXT

  3. READ VALUE USING INTELLIGENT TESTER (POWER SUPPLY OPEN)


    1. Check for DTCs Click here.

    2. Use the Data List to check if the steering lock control is functioning properly.

      Power Source Control
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Power Supply Open Open in ECU record/NG (PAST) or OK

      NG (PAST): Open in ECU

      OK: No malfunction

      		 -
      Result
      Result Proceed to

      • B2782 is not output

      • "OK" displayed on the tester.

      		 A

      • B2782 is output

      • "NG (PAST)" displayed on the tester.

      		 B

    B

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the H71 power management control ECU connector.

      A01IQIXE03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Power Management Control ECU)

      		 *2

      Front view of wire harness connector

      (to Steering Lock ECU)

    2. Disconnect the H54 steering lock ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H54-3 (IGE) - H71-8 (SLR+) Always Below 1 Ω
      H54-3 (IGE) or H71-8 (SLR+) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR