Module, Automatic Headlamp Leveling (AHLM): Installation
To avoid serious or fatal injury when working on the High Intensity Discharge (HID) headlamp system, be certain to take the proper precautions. The headlamp switch must be in the OFF position. Disconnect and isolate the battery negative cable. There is a risk of fatal injury caused by contact with high voltage used in the HID headlamps. There is a risk of explosion or fire caused by highly flammable materials in the vicinity of damaged HID lighting elements. There is a risk of injury caused by exposure to Ultra Violet (UV) light, a risk of burns caused by high component operating temperatures, a risk of mercury poisoning through glass splinters produced by bursting HID lighting elements. There is also a risk of poisoning caused by inhalation of mercury vapors and by toxic salts and mercury compounds being ingested or coming into contact with the skin. Do not come into contact with parts that are under high voltage. Persons with active electronic implants (e.g. heart pacemakers) must never work on HID headlamps. Wear insulated safety shoes, safety glasses and protective gloves. Remove flammable materials and ensure sufficient ventilation in the working area.
- Position the Automatic Headlamp Leveling Module (AHLM) (2) (also known as the Headlamp Leveling Module/HLM) on the bottom of the right front lamp unit housing (1) and connect the front lamp unit wire harness connector to the AHLM.
- Install and tighten the two screws (3) that secure the AHLM to the lamp housing. Tighten the screws securely.
- Install the right front lamp unit into the vehicle. Refer to UNIT, FRONT LAMP, INSTALLATION .
- Reconnect the battery negative cable.
On vehicles equipped with the optional High Intensity Discharge (HID) headlamps, when the Automatic Headlamp Leveling Module (AHLM) is replaced with a new unit, a diagnostic scan tool MUST be used to initialize and calibrate the new AHLM before the automatic headlamp leveling system can operate properly. Refer to MODULE, AUTOMATIC HEADLAMP LEVELING (AHLM), STANDARD PROCEDURE .