Dtc B2781 Open / Short In Steering Lock Ecu


DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC OUTPUT (B2785)

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 power management control ECU and the certification ECU.
The diagnosis information of the steering lock ECU is transmitted to the intelligent 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
Either condition is met:
  1. A steering lock motor drive power circuit malfunction.
  2. The lock and unlock position sensors are detected to be on.
  1. Steering lock actuator assembly (steering lock ECU)
  2. LIN communication system
  3. 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.
NOTICE:
  1. If the steering lock actuator assembly (steering lock ECU) is replaced, with the engine switch off and the shift lever in P (for Automatic Transmission), open and close the driver side door to record the current lock position into the steering lock ECU. If this is not performed, the engine may not start.
  2. When replacing the steering lock ECU, registration must be performed. Refer to the Service Bulletin for the registration procedure.
1.CHECK DTC OUTPUT (B2785)

  1. Check for DTCs (LandCruiser RM000001T1B05MX.html).

    Result
    Result
    		Proceed to
    DTC B2781 and DTC B2785 are output
    		A
    DTC B2781 is output, but DTC B2785 is not output
    		for Manual Tilt and Manual Telescopic Steering Column
    		B
    for Power Tilt and Power Telescopic Steering Column
    		C



B
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01JX.html)

C
REPLACE STEERING LOCK ACTUATOR ASSEMBLY (STEERING LOCK ECU) (LandCruiser RM0000039SJ01KX.html)
A

GO TO LIN COMMUNICATION SYSTEM (DTC B2785) (LandCruiser RM000002XHV0ACX.html)