Ignition "OFF".
Disconnect PCM harness connector.
Ignition "ON".
Measure voltage between Brake Light Switch terminal of PCM harness connector and chassis ground.
Measure voltage between Brake Test Switch terminal of PCM harness connector and chassis ground.
Step on the brake pedal.
Measure voltage between Brake Light Switch terminal of PCM harness connector and chassis ground.
Measure voltage between Brake Test Switch terminal of PCM harness connector and chassis ground.
Test Condition | With releasing pedal | With stepping on pedal |
Brake Light Switch | 0V | Battery Voltage |
Brake Test Switch | Battery Voltage | 0V |
Is voltage within specification?
 | ▶ Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure. |
 | ▶ Check Stop Lamp Switch for contamination, deterioration, or damage. Substitute with a known-good switch and check for proper operation. If the problem is corrected, replace switch and then go to "Verification of Vehicle Repair" procedure. |
