Braking Sensor/Switch: Testing and Inspection
Brake Switch Signal Circuit Troubleshooting1. Check the brake lights.
Are the brake lights on without pressing the brake pedal?
YES - Inspect the brake switch adjustment.
NO - Go to step 2.
2. Press the brake pedal.
Do the brake lights come on?
YES - Go to step 3.
NO - Go to step 4.
3. Measure voltage between ECM connector terminals A32 and B20 with the brake pedal pressed.
Is there battery voltage?
YES - The brake switch signal is OK.
NO - Repair open in the wire between the ECM (A32) and the brake switch.
4. Inspect the No.6 (10 A) fuse in the under-hood fuse/relay box.
Is the fuse OK?
YES - Repair open in the wire between the brake switch and the No.6 (10 A) fuse. Inspect the brake switch.
NO - Repair short in the wire between the ECM(A32) and the No.6 (10 A) fuse. Replace the No.6 (10 A) fuse.