STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

The steering lock ECU determines the on/off status of the engine switch through the IG2 signal circuit.

The steering lock ECU does not lock the steering when it receives the IG2 relay on signal. This prevents the steering from being locked while the vehicle is moving.

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

DTC Code Detection Condition Trouble Area
B2788 The IG2 input to the steering lock ECU does not match the LIN communication input.

  • IGN fuse

  • Steering lock actuator assembly (steering lock ECU)

  • Power management control ECU

  • Harness or connector

WIRING DIAGRAM

A01XM77E08

CAUTION / NOTICE / HINT

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


  • If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (for Automatic Transmission), 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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU)


    1. A01XDSFE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Steering Lock ECU)

      Disconnect the G35 steering lock ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G35-1 (GND) - Body ground Always Below 1 Ω
    3. A01XM39E01
      Text in Illustration
      *a

      Component with harness connected

      (Steering Lock ECU)

      Reconnect the G35 steering lock ECU connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G35-6 (IG2) - G35-1 (GND) Engine switch on (IG) 11 to 14 V
      G35-6 (IG2) - G35-1 (GND) Engine switch off Below 1 V
      Result
      Result Proceed to
      NG A
      OK for Manual Tilt and Manual Telescopic Steering Column B
      for Power Tilt and Power Telescopic Steering Column C

    A

    CHECK FOR SHORT IN ALL HARNESSES, CONNECTORS AND COMPONENTS CONNECTED TO IG2 FUSE

    B

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

    C

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