Lexus IS250 · Service Manual SECURITIES

Ignition Switch Circuit

Circuit diagnosis

DESCRIPTION

When the engine switch is turned on (IG), positive (+) battery voltage is applied to the main body ECU RH (cowl side J/B RH). When battery positive (+) voltage is applied to terminal IG of the main body ECU (cowl side J/B RH) while the theft deterrent system is operating, the warning stops.

WIRING DIAGRAM

B125092E01

INSPECTION PROCEDURE


1. CHECK DTC
  1. Delete DTC (Click here).

  1. Check the DTC B2271, B2272 and B2274.

    Result
    Proceed To
    No DTC is output
    OK
    Any of DTCs is output
    NG



NG
GO TO SMART ACCESS SYSTEM WITH PUSH-BUTTON START
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE


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