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Last Modified: 11-27-2007 1.6 C
Service Category: Steering Section: Steering Column
Model Year: 2008 Model: LX570 Doc ID: RM000001T1E00BX
Title: STEERING COLUMN: STEERING LOCK SYSTEM: DESCRIPTION (2008 LX570)

DTC

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 (smart key ECU assembly).

The diagnosis information of the steering lock ECU is transmitted to the Techstream via the certification ECU (smart key ECU assembly) 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:

  • A steering lock motor drive power circuit malfunction.
  • The ON condition for both the lock and unlock position sensors is detected.
  • Steering lock actuator assembly (steering lock ECU)
  • Certification ECU (smart key ECU assembly)
  • Harness or connector of LIN bus line

INSPECTION PROCEDURE

HINT:

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

PROCEDURE

1.

CHECK DTC OUTPUT (B2785)

(a) Check for DTCs.

OK:

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

OK