Daytime Running Lamp: Testing and Inspection

If the park brake switch closes, the DRL will not turn on the headlamps. The DRL senses if the park brake switch closes on circuit G9.
- Circuit L20 also connects to cavity 1 of the multifunction switch 4-way connector.
- Circuit Z1 provides a ground for the headlamps.
- Cavity 7 (circuit L20) of the headlamp switch connector has a jumper that feeds the DRL module.
- Check for a blown fuse in circuit A1 or G5.
- The headlamp switch has a 24 Amp circuit breaker that feeds circuit L20.