STEERING LOCK SYSTEM, Diagnostic DTC:B2781

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

DESCRIPTION

If the steering lock ECU (steering lock actuator assembly) determines that there is a malfunction inside the ECU, it outputs this DTC. Diagnostic communication between the steering lock ECU (steering lock actuator assembly) and the intelligent tester is performed via the certification ECU (smart key ECU assembly) as the steering lock ECU (steering lock actuator assembly) is not connected to CAN.

The steering lock ECU and steering lock actuator assembly are supplied as a unit. The steering lock ECU (steering lock actuator assembly) detects the steering lock position through the signals from the lock and unlock position sensors.

The steering lock ECU (steering lock actuator assembly) activates the steering lock motor based on permission signals from the power management control ECU and the certification ECU (smart key ECU assembly).

DTC No. DTC Detection Condition Trouble Area
B2781
  • Steering lock motor drive circuit is defective.

  • Both lock and unlock position sensors detect "ON".


  • Steering lock ECU (Steering lock actuator assembly)

  • LIN communication system

  • Harness or connector of LIN bus line

INSPECTION PROCEDURE

Note


  • If the steering lock ECU (steering lock actuator assembly) is replaced, with the power switch off and the shift lever to P, open and close the driver side door to record the current lock position into the steering lock ECU (steering lock actuator assembly). If this is not performed, the engine may not start.

  • After replacing the steering lock ECU (steering lock actuator assembly), registration must be performed refer to the Service Bulletin for the registration method.

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 for DTCs Click here.

      Result
      Result Proceed to
      DTC B2781 is output, but DTC B2785 is not output. A
      Condition other than following: DTC B2781 is output, but DTC B2785 is not output. B

    B
    A