Headlamp: Testing and Inspection

- Circuit L20 is spliced to feed the Daytime Running Lamp (DRL) module (if equipped).
- Check for a blown fuse in cavity 17 for L43 and cavity 18 for L44.
- Check the 40 Amp fuse located in the PDC.
- The headlamp switch has a 24 Amp internal circuit breaker.
- For the left front parking lamp, turn signal, side marker lamp and left headlamp, the Z1 circuit grounding point is the left side of the radiator closure panel.
- For the right front parking lamp, turn signal, side marker lamp and right headlamp, the Z1 circuit grounding point is in the right fender side shield.
- If the park brake switch is CLOSED, the DRL will not turn on the headlamps. The DRL senses if the park brake switch is CLOSED on circuit G9.
- Circuit Z1 provides ground for the headlamps.
- Circuit L20 of the headlamp switch connector has a jumper that feeds the DRL module.
- Check for a blown fuse in circuits A1 or G5.
- The headlamp switch has a 24 Amp circuit breaker that feeds circuit L20.