Dtc B2285 Steering Lock Position Signal Circuit Malfunction

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Starting. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER (STEERING LOCK CONDITION)

CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)

CHECK POWER SOURCE CONTROL ECU

DTC B2285 Steering Lock Position Signal Circuit Malfunction

DTC B2288 Steering Lock Signal Circuit Malfunction


DESCRIPTION

The power source control ECU and the steering lock ECU are connected by a cable and the LIN. These DTCs are output when: 1) the cable information and LIN information are inconsistent; and 2) a malfunction is detected between the power source control ECU and the steering lock ECU.

DTC No.
DTC Detection Condition
Trouble Area
B2285
Cable and LIN information between power source control ECU and steering lock ECU are inconsistent
  1. Power source control ECU
  1. Steering lock system
  1. Wire harness
B2288
After turning engine switch from off to on (IG), steering wheel does not unlock for certain period of time (ECU unlocks steering wheel only when it receives unlock signal from LIN communication and cable)
  1. Power source control ECU
  1. Steering lock system
  1. Wire harness

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System. Dtc B2285 Steering Lock Position Signal Circuit Malfunction


INSPECTION PROCEDURE

1.READ VALUE OF INTELLIGENT TESTER (STEERING LOCK CONDITION)

  1. Check the Data List for proper functioning of the steering lock condition.


Power source control ECU:

Item
Measurement Item/Display (Range)
Normal Condition
Diagnostic Note
Str Unlock SW
Steering lock condition/ ON or OFF
ON: Steering is unlocked
OFF: Steering is locked
-
OK:
ON (steering is unlocked) appears on the screen.


NG
Go to step 2
OK

REPLACE POWER SOURCE CONTROL ECU

2.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - STEERING LOCK ECU)


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Starting.Starting System. Dtc B2285 Steering Lock Position Signal Circuit Malfunction

  1. Disconnect the L73 ECU connector.

  1. Disconnect the L28 ECU connector.

  1. Measure the resistance of the wire harness side connectors.

    Standard resistance:
    Tester Connection
    		Specified Condition
    L73-26 (SLP) - L28-4 (SLP1)
    		Below 1 Ω
    L73-26 (SLP) or L28-4 (SLP1) - Body ground
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK


3.CHECK POWER SOURCE CONTROL ECU

  1. Temporarily replace the power source control ECU with a new or normally functioning one.

  1. Check that the engine starts normally.

    OK:
    Engine starts normally.


NG
GO TO STEERING LOCK SYSTEM
OK

END (POWER SOURCE CONTROL ECU IS FAULTY)