| HEADLAMP DOES NOT ILLUMINATE |
1. Ineffective or missing
bulb. |
1. Test and replace
headlamp bulb if required. |
| 2. Ineffective ground
circuit. |
2. Test and repair
open headlamp ground circuit if required. |
| 3. Ineffective feed
circuit. |
3. Test and repair
open headlamp low beam or high beam feed circuit if required. |
| 4. Ineffective
headlamp switch. |
4. Test and
replace the headlamp switch 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. |
| HEADLAMP DOES NOT EXTINGUISH |
1. Ineffective feed
circuit. |
1. Test and repair
shorted headlamp low beam or high beam feed circuit if required. |
| 2. Ineffective headlamp
switch. |
2. Test and replace
the headlamp switch 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. |