Headlamp: Description and Operation

The headlamp system consists of:
^ Two aerodynamic headlamps with replaceable halogen headlamp bulb and retainers.
^ Multi-position headlamp switch.
^ Headlamp dimmer switch (part of multi-function switch).
^ LCM.
^ Circuit wiring and circuit protection.

In normal operation:
^ With the headlamp dimmer switch in the LO position (middle position), power is supplied by the LCM to the low beam elements.
^ With the headlamp dimmer switch in the HI position (forward detent), power is supplied by the LCM through the multi-function switch to the high beam elements and the high beam indicator is controlled by the instrument cluster in response to SCP message from the LCM.
^ When the headlamp dimmer switch is pulled toward the steering wheel, the flash-to-pass switch in the multi-function switch is closed, and power is supplied to the headlamp from the LCM (through the multi-function switch). When the headlamp dimmer switch is released, the head lamps return to LO beam.
^ The battery saver feature of the LCM will automatically turn off exterior and interior lamp under the following condition:
- Ignition switch OFF.
- Headlamp switch in PARK or HEAD.
- After 10 minutes.

Headlamp Delay System -Autolamp
The autolamp system:
^ Provides light sensitive on-off control of the lamps normally controlled by the headlamp switch.
^ Provides for increased visibility for occupants when leaving the vehicle by keeping the lamps on for a preselected period of time after the ignition switch is turned OFF.
^ The preselected time lapse can be adjusted by the vehicle operator for up to three minutes.

The system consists of:
^ A light-sensitive light sensor amplifier.
^ LCM.
^ An autolamp time delay control which is part of the LCM and includes an OFF position.

For the autolamp system to be operational, the autolamp time delay control must be moved from the OFF position and the headlamp switch must be OFF.

In normal operation:
^ The system will turn the exterior lamps on when the light available to the light sensor amplifier decreases below a predetermined level, such as at sunset.
^ The lamps will automatically turn off when the level of outside light exceeds a predetermined level, such as during daylight hours.

The light sensor amplifier:
^ Is mounted in the center of the defroster grille panel.
^ Must always be exposed to outside light to function properly.

Do not place any items in the center of the windshield which may block light to the light sensor amplifier and cause erratic operation of the system.

The autolamp time delay control (part of the LCM), located to the left of the steering column and part of the headlamp switch operates as follows:
^ The auto lamp system is functional for automatic operation when the autolamp time delay control is moved from the OFF position.
^ The autolamp time delay is controlled by rotating the headlamp switch in a counterclockwise direction (maximum three minutes).

Turning on the regular headlamp switch will override the auto lamp. Automatic operation will not be possible until the regular headlamp switch is turned OFF.