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.

After receiving an integration relay (IG2 relay) on signal, the steering lock ECU determines that the vehicle is moving.

The steering lock ECU does not lock the steering when it receives the integration relay (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 (smart key ECU assembly) as the steering lock ECU is not connected to the CAN communication system.

DTC Code Detection Condition Trouble Area
B2788 Open or short in IG2 signal circuit

  • Steering lock actuator assembly (steering lock ECU)

  • IGN fuse

  • IG2 MAIN fuse

  • Integration relay (IG2 relay)

  • Main body ECU

  • Harness or connector

WIRING DIAGRAM

A01X8ZRE07

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.

PROCEDURE


  1. INSPECT STEERING LOCK ECU

    A01XB8NE02
    *1 Component with harness connected: (Steering Lock ECU)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      E26-6 (IG2) - E26-1 (GND) Engine switch off Below 1 V
      E26-6 (IG2) - E26-1 (GND) Engine switch on (IG) 11 to 14 V
      Result
      Result Proceed to
      Within specified range (for Power tilt and telescopic) A
      Outside specified range B
      Within specified range (for Manual tilt and telescopic) C

    A

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

    C

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

    B

  2. INSPECT FUSE (IGN, IG2 MAIN)


    1. Remove the IGN fuse and IG2 MAIN fuse from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IGN fuse Always Below 1 Ω
      IG2 MAIN fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. INSPECT INTEGRATION RELAY (IG2 RELAY)

    A01XB5QE04
    *1 Component without harness connected: (Integration Relay)

    1. Remove the integration relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      1B-8 - 1C-1 Battery voltage is applied to terminals 1B-6 and 1B-7 Below 1 Ω
      1B-8 - 1C-1 Battery voltage is not applied to terminals 1B-6 and 1B-7 10 kΩ or higher

    NG

    REPLACE INTEGRATION RELAY (IG2 RELAY)

    OK

  4. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)

    A01XA40E02
    *1 Front view of wire harness connector: (to Steering Lock ECU)
    *2 Front view of wire harness connector: (to Integration Relay)

    1. Disconnect the E26 steering lock ECU connector.

    2. Disconnect the 1B and 1C integration relay connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      1C-1 - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      E26-6 (IG2) - 1B-8 Always Below 1 Ω
      E26-6 (IG2) or 1B-8 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU - INTEGRATION RELAY (IG2 RELAY) AND BODY GROUND)

    A01X8FYE02
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Front view of wire harness connector: (to Integration Relay)

    1. Disconnect the E2 main body ECU connector.

    2. Disconnect the 1B integration relay connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E2-11 (IG2D) - 1B-6 Always Below 1 Ω
      1B-7 - Body ground Always Below 1 Ω
      E2-11 (IG2D) or 1B-6 - Body ground Always 10 kΩ or higher

    OK

    REPLACE MAIN BODY ECU

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR