| A SINGLE LAMP IN THE COURTESY LAMP CIRCUIT DOES NOT ILLUMINATE | 1. Ineffective or missing bulb or Light Emitting Diode (LED) unit. | 1. Test and replace the lamp bulb or LED unit if required. |
| 2. Ineffective lamp switch. | 2. Test and replace a 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 left multi-function switch. | 5. Test and replace the left multi-function switch if required. |
| 6. Ineffective ElectroMechanical Instrument Cluster (EMIC) inputs or outputs. | 6. Use a diagnostic scan tool and the appropriate diagnostic information for further EMIC diagnosis. |
| 7. Ineffective Totally Integrated Power Module (TIPM) inputs or outputs. | 7. Use a diagnostic scan tool to test the TIPM 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 console storage bin lamp switch, 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 deck lid ajar switch if required. |
| 2. Ineffective ajar switch sense circuit. | 2. Test and repair the shorted ajar switch sense circuit if required. |
| 3. Ineffective EMIC inputs or outputs. | 3. Use a diagnostic scan tool and the appropriate diagnostic information for further EMIC diagnosis. |
| 4. Ineffective TIPM inputs or outputs. | 4. Use a diagnostic scan tool to test the TIPM inputs and outputs. Refer to the appropriate diagnostic information. |