Signal Circuit Inspection
- Ignition "ON" & Engine "OFF".
- Press the brake pedal.
- Measure voltage between the terminal "5, 21" of the HECU harness connector and chassis ground.
Specification:
Brake Light Switch - Approx. B+
Brake Switch - Approx. 0 V
- Is the measured signal waveform within specifications?
YES : --> Fault is intermittent caused by open harness in brake light switch and brake switch line, faulty brake light switch or was repaired and HECU memory was not cleared. Go to the applicable troubleshooting procedure.
NO : --> Check for damaged harness and poor connection in the power harness between the battery terminal (+) and the terminal "5, 21" of the HECU harness connector. Check for open or blown 15 A stop fuse. Repair as necessary and then go to "VERIFICATION OF VEHICLE REPAIR " procedure.
--> If OK, Go to "COMPONENT INSPECTION " procedure.