STEERING LOCK SYSTEM, Diagnostic DTC:B2781

DTC Code DTC Name
B2781 Open / Short in Steering Lock ECU

DESCRIPTION

The steering lock ECU and steering lock actuator assembly are supplied as a unit.

The steering lock ECU detects the steering lock position through the signals from the lock and unlock position sensors.

The steering lock ECU activates the steering lock motor based on permission signals from the main body ECU and the certification ECU.

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 Detection Condition Trouble Area
B2781

When either condition below is met:


  • Steering lock motor drive power circuit malfunction

  • Lock and unlock position sensors' ON condition is detected

  • Steering lock actuator assembly (steering lock ECU)

  • Certification ECU

  • Harness or connector of LIN bus line

CAUTION / NOTICE / HINT

Tech Tips

When the power 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 power switch OFF, open the driver door. Then (with the power switch still OFF) open and close any door several times at 1.5 second intervals.

PROCEDURE


  1. CHECK DTC OUTPUT (B2785)


    1. Check the DTCs.

      OK
      DTC B2781 is output, but DTC B2785 is not output.

    OK

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

    NG

    GO TO LIN COMMUNICATION SYSTEM (DTC B2785) Click here