STEERING LOCK SYSTEM, Diagnostic DTC:B2782

DTC Code DTC Name
B2782 Power Source Control ECU Malfunction

DESCRIPTION

  • The steering lock ECU activates the steering lock motor by the power from the power management control ECU through the IGE circuit. This prevents the steering from being locked while the vehicle is moving.

  • If NG (PAST) is displayed for Power Supply Open in the Data List, perform troubleshooting according to the procedures below.

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

C199368E04

CAUTION / NOTICE / HINT

Tip:

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. U122996E02

      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
      Table 1. Text in Illustration

      *1

      Front view of wire harness connector

      (to Steering Lock ECU)
    4. U122731E02

      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)
      Tip:

      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.

      Table 2. Text in Illustration

      *1

      Component with harness connected

      (Steering Lock ECU)

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

  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.

  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.

      Table 3. 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

      -
      Table 4. Result

      Result

      Proceed to

      • B2782 is not output

      • "OK" displayed on the tester.

      A

      • B2782 is output

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

      B

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)

    (Click here)

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

    1. Disconnect the H71 power management control ECU connector.

      U123067E02
      Table 5. 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
      Table 6. Result

      Result

      Proceed to

      NG

      A

      OK (for LHD)

      B

      OK (for RHD)

      C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)