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 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 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 tester via the certification ECU as the steering lock ECU is not connected to the CAN communication system.

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

  • Wire harness or connector

  • IG2 relay

  • Steering lock actuator (Steering lock ECU)

  • Main body ECU

WIRING DIAGRAM

A001EPEE06
*a Steering Lock Motor
*b from Battery
*c Main Body ECU
*d Steering Lock Actuator (Steering Lock ECU)

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 step 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. CHECK STEERING LOCK ACTUATOR (IG2 VOLTAGE)

    A001CJ5E03
    *1 Component with harness connected: (Steering Lock Actuator)

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L33-6 (IG2) - L33-2 (SGND) Engine switch on (IG) 11 to 14 V
      L33-6 (IG2) - L33-2 (SGND) Engine switch off Below 1 V

    OK

    REPLACE STEERING LOCK ACTUATOR

    NG

  2. INSPECT FUSE (ECU-IG, P IG2)


    1. Remove the ECU-IG fuse from the engine room No. 2 junction block.

    2. Remove the P IG2 fuse from the passenger side junction block.

    3. Measure the resistance of the fuses.

      Standard resistance
      Tester Connection Condition Specified Condition
      ECU-IG fuse Always Below 1 Ω
      P IG2 fuse Always Below 1 Ω

    NG

    REPLACE FUSE

    OK

  3. INSPECT IGNITION RELAY NO. 2 (IG2)


    1. A001AX6E33

      Remove the ignition relay No.2 from the engine room No. 2 junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      3 - 5 When battery voltage is not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 When battery voltage is applied to terminals 1 and 2 Below 1 Ω

    NG

    REPLACE IGNITION RELAY NO. 2 (IG2)

    OK

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

    A001B6ZE06
    *1 Front view of wire harness connector: (to Main Body ECU)
    *2 Engine Room No. 2 Junction Block
    *3 Ignition Relay No. 2 (IG2)

    1. Disconnect the L12 main body ECU connector.

    2. Remove the IG2 relay from the engine room No. 2 junction block.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      L12-11 (IG2D) - Relay block ignition relay No.2 terminal 1 Always Below 1 Ω
      L12-11 (IG2D) - Body ground Always 10 kΩ or higher
      Relay block ignition relay No.2 terminal 2 - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK MAIN BODY ECU (IG2D OPERATION)


    1. Connect the L12 main body ECU connector.

    2. A001A3UE03
      Component without IG2 Relay
      *1 Ignition Relay No. 2 (IG2)
      *2 Engine Room No. 2 Junction Block

      Remove the ignition relay No. 2 from the engine room No. 2 junction block.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      Relay block ignition relay No. 2 terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPLACE MAIN BODY ECU

    OK

  6. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BATTERY)


    1. A001CVOE03
      *1 Front view of wire harness connector: (to Steering Lock Actuator)

      Disconnect the L33 steering lock ECU connector.

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      L33-6 (IG2) - Body ground Engine switch on (IG) 11 to 14 V

    OK

    REPLACE STEERING LOCK ACTUATOR

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR