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Home >> Toyota >> 1997 >> Corolla LE >> Repair and Diagnosis >> Brakes >> Traction Control >> Anti-Lock Brake System >> Circuit Tests >> Stoplight Switch Circuit >> Diagnostic Procedure

Diagnostic Procedure

  1. Ensure stoplights illuminate when brake pedal is depressed, and turn off when released. If operation is as specified, go to next step. If operation is not as specified, repair stoplight circuit. See WIRING DIAGRAMS .
  2. Remove ABS ECU, leaving harness connectors connected. Using DVOM, measure voltage (backprobe) between chassis ground and terminal No. 12 (STP circuit) at 26-pin ABS ECU harness connector. See Figure. Depress brake pedal. If voltage is 8-14 volts, perform next logical circuit check listed in SYMPTOM DIAGNOSIS table. See SYMPTOM DIAGNOSIS under TROUBLE SHOOTING. If voltage is not 8-14 volts, go to next step.
  3. Check for open circuit in wiring harness between ABS ECU and stoplight switch. See WIRING DIAGRAMS . Repair as necessary. If no problem is found, replace ABS ECU.
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