STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

The steering lock ECU receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU equals to the voltage that is applied to the steering lock ECU, the steering will be unlocked. The steering lock ECU will not lock the steering when power from the IG2 relay is present. This prevents the steering from being locked while the vehicle is moving.

DTC No. DTC Detecting Condition Trouble Area
B2788 Different information is obtained from IG2 signals received directly from the IG2 circuit, and from IG2 signals sent via LIN communication for a period of 1 second.

  • IG2 relay

  • Wire harness

  • Power source control ECU

  • Steering lock actuator assembly (Steering lock ECU)

WIRING DIAGRAM

A0163BAE01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT NO. 2 IGNITION RELAY


    1. A0161CIE95

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

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

      Standard Resistance
      Tester Connection Specified Condition
      3 - 5 10 kΩ or higher
      3 - 5

      Below 1 Ω

      (when battery voltage is applied to terminals 1 and 2)

    NG

    REPLACE NO. 2 IGNITION RELAY

    OK

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


    1. A0162CFE02

      Disconnect the J29 connector from the steering lock actuator assembly.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J29-1 (GND) - Body ground Always Below 1 Ω
      J29-2 (SGND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (STEERING LOCK ACTUATOR ASSEMBLY - BATTERY)


    1. A0162CFE03

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J29-6 (IG2) - J29-1 (GND) Engine switch on (IG) 10 to 14 V
      J29-6 (IG2) - J29-2 (SGND) Engine switch on (IG) 10 to 14 V

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      *J29-6 (IG2) - J29-7 (B) Engine switch off 10 kΩ or higher

      *: This measurement is performed with the engine switch off to check for a battery voltage short in the IG2 circuit.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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