Dtc B2781 Open / Short In Steering Lock Ecu

Steering. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
Steering Column. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

INSPECTION PROCEDURE

CHECK DTC (CERTIFICATION ECU)

DTC B2781 Open / Short in Steering Lock ECU


DESCRIPTION

The steering lock ECU and steering lock actuator are supplied as a unit.
The steering lock ECU detects the steering lock position through the signals from the lock and unlock 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 No.
DTC Detection Condition
Trouble Area
B2781
  1. Steering lock motor drive power circuit malfunction
  2. Both lock and unlock position sensors detect ON
  1. Steering lock actuator (Steering lock ECU)
  2. Wire harness
  3. LIN bus line
  4. Certification ECU

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 step to wake up the ECU:
Before starting the inspection, 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.
1.CHECK DTC (CERTIFICATION ECU)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG) and press the intelligent tester main switch ON.

  1. Read the DTCs of the certification ECU by following the prompts displayed on the intelligent tester.

    OK:
    DTC B2781 is output, but DTC B2785 (LIN bus line malfunction) is not output.


NG
REFER TO B2785
OK

REPLACE STEERING LOCK ACTUATOR ASSEMBLY