Lexus IS250 · Service Manual STEERING

PS Warning Light does not Come ON

Circuit diagnosis

WIRING DIAGRAM

B124162E03

INSPECTION PROCEDURE


1. INSPECT CAN COMMUNICATION SYSTEM

  1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the CAN communication system.

    OK:
    DTCs are not output.



 NG
GO TO CAN COMMUNICATION SYSTEM
OK


2. INSPECT MULTIPLEX COMMUNICATION SYSTEM

  1. Using the intelligent tester, check for DTCs and confirm that there are no problems in the multiplex communication system (BEAN).

    OK:
    DTCs are not output.



 NG
GO TO MULTIPLEX COMMUNICATION SYSTEM
OK


3. INSPECT COMBINATION METER ASSEMBLY

  1. Connect the intelligent tester to the DLC3.

  1. Turn the engine switch on (IG).

  1. Perform the Active Test according to the display on the tester.

    Combination Meter: 
    Item
    		 Test Details
    		 Diagnostic Note
    Indicat EPS
    		 PS indicator light OFF/ON
    		 -

    OK:
    PS indicator light comes on.

    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).



 NG
REPLACE COMBINATION METER ASSEMBLY
OK

REPLACE POWER STEERING ECU ASSEMBLY


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