Always On - Malfunction In ECU

CIRCUIT DESCRIPTION





DETECTING CONDITIONS

HINT: There is a case that LEXUS hand-held tester cannot be used when ECU is abnormal.

Fail safe function:
If any trouble occurs in the ECU, the ECU cuts off current to the ABS solenoid relay and prohibits ABS & TRAC & VSC controls and the brake system becomes normal.





WIRING DIAGRAM

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INSPECTION PROCEDURE