| BRAKE LAMP DOES NOT ILLUMINATE |
1. Ineffective or missing fuse. |
1. Test and replace brake lamp fuse as required. |
| 2. Ineffective or missing bulb. |
2. Test and replace brake lamp bulb as required. |
| 3. Ineffective ground circuit. |
3. Test and repair brake lamp ground circuit as required. |
| 4. Ineffective feed circuit. |
4. Test and repair open brake lamp switch output circuit as required. |
| 5. Ineffective switch. |
5. Test and replace brake lamp switch as required. |
| 6. Ineffective TIPM inputs or outputs. |
6. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate Diagnostic Information. Check TIPM for DTC's. |
| BRAKE LAMP DOES NOT EXTINGUISH |
1. Ineffective feed circuit. |
1. Test and repair shorted brake lamp switch output circuit as required. |
| 2. Ineffective switch. |
2. Test and replace brake lamp switch as required. |