High Intensity Discharge Headlamps

Fig.23 HID System Components:

The High Intensity Discharge (HID) headlamps are supplied B+ voltage and ground by the same connector used to power the normal halogen low beam lamp. The low beam system is different from there forward. The ballast module is mounted to the bottom of the headlamp unit. The ballast module has internal circuit protection to prevent module damage in case of an open or shorted circuit. If the module senses a short or open circuit condition, it will not operate the lamp/igniter.

The headlamp unit assembly must be removed to perform the following tests.

1. Inspect lamp/igniter assembly for a burned out lamp. If lamp is burned out it will appear black or smoky, similar to a normal halogen bulb. If lamp looks OK, go to Step 2.
2. Check for B+ battery voltage at the two pin connector going into the ballast module. Refer to Wiring Diagrams for connector location. If battery voltage and a good ground are present, go to Step 3. If B+ voltage and a good ground are not present, refer to Wiring Diagrams for circuit and connector locations to find short or open circuit.
3. Plug in a known good ballast module and check for lamp operation. If lamp lights, replace ballast module. If lamp still fails to light, replace lamp/igniter assembly.