| BACKUP LAMP DOES NOT ILLUMINATE |
1. Ineffective LED lamp. |
1. Test and replace the LED lamp if required. |
| 2. Ineffective ground circuit. |
2. Test and repair open backup LED lamp ground circuit if required. |
| 3. Ineffective feed circuit. |
3. Test and repair open backup LED lamp feed circuit if required. |
| 4. Ineffective switch. |
4. Test and replace the Transmission Range Sensor (TRS) if required. |
| 5. Ineffective BCM inputs or outputs. |
5. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information. |
| BACKUP LAMP DOES NOT EXTINGUISH |
1. Ineffective feed circuit. |
1. Test and repair shorted backup LED lamp feed circuit if required. |
| 2. Ineffective switch. |
2. Test and replace the TRS if required. |
| 3. Ineffective BCM inputs or outputs. |
3. Use a diagnostic scan tool to test the BCM inputs and outputs. Refer to the appropriate diagnostic information. |