Are the brake lights off?
YES -
Intermittent failure, the system is OK at this time. Check for loose or poor connections.?
NO -
Go to step 4.
4. Test the brake pedal position switch See: Brakes and Traction Control/Antilock Brakes / Traction Control Systems/Braking
Sensor/Switch/Testing and Inspection.
Is the brake pedal position switch OK?
YES -
Go to step 5.
NO -
Adjust or replace the brake pedal position switch, and recheck See: Brakes and Traction Control/Brake Pedal Assy/Service and Repair.?
5. Test the brake light relay See: Power and Ground Distribution/Testing and Inspection/Power Relay Test.
Is the relay OK?
YES -
Go to step 6.
NO -
Replace the relay, and recheck.?
6. Disconnect the brake pedal position switch 4P connector.
7. Measure the voltage between brake pedal position switch 4P connector terminal No. 2 and body ground.
Is there battery voltage?
YES -
Repair a short to power in the wire between the brake pedal position switch and the brake light relay.?
NO -
Go to step 8.
8. Disconnect the ACC unit 20P connector.
9. Measure the voltage between ACC unit 20P connector terminal No. 1 and body ground.
