Always On - ABS & TRAC ECU Malfunction

DTC Always ON Malfunction In ECU





DETECTING CONDITION

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

Fail safe function:
If 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. When fail safe function in ABS system is activated, "VSC" warning light and "VSC OFF" indicator light tight up.





WIRING DIAGRAM

Step 1:

Step 2:

Step 3:

Step 4:

Step 5:

Step 6:

INSPECTION PROCEDURE