Headlamp: Description and Operation

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

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 high beam relay to the high beam elements and to the high beam indicator in the instrument cluster.
^ 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 headlamps, from the LCM (through the high-beam relay). When the headlamp dimmer switch is released, the headlamps return to LO beam.
^ The battery saver feature of the LCM will automatically turn off exterior and interior lamps under the following condition.
^ Ignition switch OFF.
^ Headlamp switch in PARK or HEAD.
^ A predetermined time period has lapsed.

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. An autolamp indicator lamp will light when the lamps are energized by the autolamp system.

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 system light sensor amplifier:
^ Is mounted under a group of slotted holes in the instrument panel upper finish panel, left of the steering column.
^ Must always be exposed to outside light to function properly

Do not place any items in the LR corner 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 right of the headlamp switch operates as follows:
^ The autolamp system is functional for automatic operation when the autolamp time delay control is moved from the OFF position.
^ The longer the autolamp time delay control is held toward the max-delay, the longer the lamps will stay on after the ignition switch is turned to the OFF position.
^ The autolamp delay time is displayed in the message center when the autolamp switch is pressed.

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