| A SINGLE LAMP IN THE COURTESY LAMP CIRCUIT DOES NOT ILLUMINATE |
1. Ineffective or missing bulb. |
1. Test and replace the courtesy lamp bulb if required. |
| 2. Ineffective lamp switch. |
2. Test and replace a map/reading lamp switch if required. |
| 3. Ineffective ground circuit. |
3. Test and repair the open ground circuit if required. |
| 4. Ineffective feed circuit. |
4. Test and repair the open feed circuit if required. |
| ALL LAMPS IN THE COURTESY LAMP CIRCUIT DO NOT ILLUMINATE |
1. Ineffective ground circuit. |
1. Test and repair the open ground circuit if required. |
| 2. Ineffective feed circuit. |
2. Test and repair the open feed circuit if required. |
| 4. Ineffective courtesy lamp control circuit. |
4. Test and repair the courtesy lamp control circuit if required. |
| 5. Ineffective Instrument Panel Cluster (IPC) inputs or outputs. |
5. Use a diagnostic scan tool to test the IPC inputs and outputs. Refer to the appropriate diagnostic information. |
| A SINGLE LAMP IN THE COURTESY LAMP CIRCUIT DOES NOT EXTINGUISH |
1. Ineffective lamp switch. |
1. Test and replace a map/reading lamp switch if required. |
| ALL LAMPS IN THE COURTESY LAMP CIRCUIT DO NOT EXTINGUISH |
1. Ineffective ajar switch. |
1. Test and replace a door ajar or liftgate ajar switch if required. |
| 2. Ineffective ajar switch sense circuit. |
2. Test and repair the shorted ajar switch sense circuit if required. |
| 3. Ineffective Body Control Module (BCM) inputs or outputs. |
3. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information. |
| 4. Ineffective IPC inputs or outputs. |
4. Use a diagnostic scan tool to test the IPC inputs and outputs. Refer to the appropriate diagnostic information. |