| A SINGLE LAMP IN THE COURTESY LAMP CIRCUIT DOES NOT ILLUMINATE |
1. Ineffective or missing bulb (except LED lamps). |
1. Test and replace the courtesy lamp bulb if required. |
| 2. Ineffective lamp switch. |
2. Test and replace a dome lamp switch, dome/reading lamp switch, glove box lamp switch or vanity 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. Courtesy DEFEAT feature turned ON. |
1. Turn courtesy DEFEAT feature OFF. |
| 2. Ineffective ground circuit. |
2. Test and repair the open ground circuit if required. |
| 3. Ineffective or missing fuse. |
3. Test and replace the fuse if required. |
| 4. Ineffective courtesy lamp control circuit. |
4. Test and repair the courtesy lamp control circuit if required. |
| 5. Ineffective dimmer module. |
5. Test and replace the dimmer module if required. |
| 6. Ineffective BCM inputs or outputs. |
6. Use a diagnostic scan tool and the appropriate diagnostic information for further BCM diagnosis. |
| A SINGLE LAMP IN THE COURTESY LAMP CIRCUIT DOES NOT EXTINGUISH |
1. Ineffective lamp switch. |
1. Test and replace a dome/reading lamp switch, glove box lamp switch or vanity 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 dimmer module. |
3. Test and replace the dimmer module if required. |
| 4. Ineffective BCM inputs or outputs. |
4. Use a diagnostic scan tool and the appropriate diagnostic information for further BCM diagnosis. |