STEERING LOCK SYSTEM, Diagnostic DTC:B2788

DTC Code DTC Name
B2788 IG2 Signal Malfunction

DESCRIPTION

The steering lock ECU (steering lock actuator assembly) receives power from the IG2 relay. When the voltage value indicated by the IG signal from the certification ECU (smart key ECU assembly) equals to the voltage that is applied to the steering lock ECU (steering lock actuator assembly), the steering wheel will be unlocked. The steering lock ECU (steering lock actuator assembly) will not lock the steering wheel 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 1 second.

  • IG2 relay

  • Wire harness

  • Power management control ECU

  • Steering lock ECU (Steering lock actuator assembly)

WIRING DIAGRAM

A01ELE4E01

INSPECTION PROCEDURE

PROCEDURE


  1. INSPECT NO. 2 IGNITION RELAY


    1. A01EML6E02
      Text in Illustration
      *1 IG2 Relay

      Remove the IG2 relay from the engine room junction block and relay block.

    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 between terminals 1 and 2)

    NG

    REPLACE NO. 2 IGNITION RELAY

    OK

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


    1. A01EMLNE11
      Text in Illustration
      *1

      Front view of wire harness connector

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

      Disconnect the D17 connector from the steering lock ECU (steering lock actuator assembly).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D17-1 (GND) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01EMLNE12
      Text in Illustration
      *1

      Front view of wire harness connector

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D17-6 (IG2) - D17-1 (GND) 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
      *D17-6 (IG2) - D17-7 (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 ECU (STEERING LOCK ACTUATOR ASSEMBLY) Click here