STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

The steering lock ECU determines the on (IG)/off status of the engine switch through the IG2 signal circuit. On 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 an IG2 relay ON signal to prevent 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 because the steering lock ECU is not connected to the CAN communication system.

DTC No. DTC Detection Condition Trouble Area
B2788 Open or short in IG2 signal circuit

  • Harness or connector

  • Steering lock actuator assembly (Steering lock ECU)

  • IG2 relay circuit

WIRING DIAGRAM

A011BMPE02

INSPECTION PROCEDURE

Note

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

Tech Tips

When the engine switch is off, the power management control ECU*1 or power source control ECU*2 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.

Connect the intelligent tester to the DLC3 with the engine switch off, and turn any door courtesy switch ON and OFF at 1.5-second intervals until communication between the intelligent tester and the vehicle begins.


PROCEDURE


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

    A0117BGE02
    Text in Illustration
    *1

    Component with harness connected:

    (Steering Lock Actuator Assembly (Steering Lock ECU))

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D33-6 (IG2) - Body ground Engine switch on (IG) 11 to 14 V
      D33-6 (IG2) - Body ground Engine switch off Below 1 V

    NG

    REPAIR OR REPLACE RELAY CIRCUIT (IG2 RELAY)

    OK

  2. CHECK HARNESS AND CONNECTOR (STEERING LOCK ECU - BODY GROUND)


    1. A011B9LE01
      Text in Illustration
      *1

      Front view of wire harness connector:

      (to Steering Lock Actuator Assembly (Steering Lock ECU))

      Disconnect the connector from the steering lock ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D33-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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