AUTOMATIC HEADLAMP SYSTEM
Automatic headlamps are controlled by the Cab Compartment Node (CCN). With the headlamp switch in the AUTO
position, the CCN will control the headlamp, parking, side marker, tail and instrumentation lamps based on ambient
light levels. Ambient light levels are monitored by the CCN using the ambient light signal present. Ambient light
readings are averaged to limit cycling the lamps ON and OFF when passing through areas with varying light levels.
The automatic headlamps will only function when the engine is running with the RPM greater than 300. When the
headlamp switch is in the AUTO position (Automatic mode), the Headlamp Time Delay system will function when the
ignition switch is placed in any position other than run/start.
HEADLAMP TIME DELAY SYSTEM
The headlamp time delay system is activated by turning the headlamps ON (high or low beam) while the engine is
running, turning the ignition switch OFF, and then turning the headlamp switch OFF. The Cab Compartment Node
(CCN) will allow the headlamps to remain ON for 90 seconds (configurable) before they automatically turn off (If the
key is in the ignition during the headlamp time delay mode, then both the headlamps and park lamps (including
panel dimming) will be ON). Refer to the Owner’s Manual for more information.
If the headlamp switch is in the Auto Headlamp Position, the headlamps are ON due to the night signal from the
ambient light sensor and the ignition switch is in any position other than run/start, the CCN shall enter a 90 second
(configurable) Auto Headlamps time delay mode. If the key is in the ignition during the headlamp time delay mode,
then both the headlamps and park lamps (including panel dimming) will be ON. If the key is not in the ignition, then
only the headlamps will be ON. The CCN will allow the headlamps to remain ON for 90 seconds before they auto-
matically turn OFF. Refer to the Owner’s Manual for more information.
WARNING
Eye protection should be used when servicing glass components. Personal injury or death could result.
This vehicle contains mercury added devices added by the manufacturer: High Intensity Discharge (HID)
headlamps. Remove devices before vehicle disposal. Upon removal of devices, please reuse, recycle, or
dispose of as hazardous waste.
Do not back probe any connectors or pierce any wiring to the HID headlamp system. High voltage (a/c volt-
age) is used in this system and component and personal injury or death could result (Refer to 8 - ELEC-
TRICAL/LAMPS/LIGHTING - EXTERIOR/HEADLAMP - DIAGNOSIS AND TESTING - HID HEADLAMPS).
Do not power up the headlamp assembly with the headlamp access cover off. A high voltage a/c (alternating
current) shock may occur causing personal injury or death.
On vehicles equipped with airbags, disable the airbag system before attempting any steering wheel, steer-
ing column, or instrument panel component diagnosis or service. Disconnect and isolate the battery nega-
tive cable, then wait two minutes for the airbag system capacitor to discharge before performing further
diagnosis or service. Failure to take the proper precautions could result in accidental airbag deployment
and possible personal injury or death.
Do not touch the glass of halogen bulbs with fingers or other possibly oily surface, reduced bulb life will
result. Do not use bulbs other than those indicated in the bulb application table. Damage to lamp and/or
daytime running lamp module can result. Do not use fuses, circuit breakers or relays having greater amper-
age value than indicated on the fuse panel or in the owners manual.
Do not use bulbs other than those listed in the bulb application table. Damage to lamp can result. Do not
touch bulbs with fingers or other oily surfaces. Bulb life will be reduced.
STANDARD PROCEDURE
FRONT LAMP AIMING
VEHICLE PREPARATION FOR LAMP ALIGNMENT
1. Check for and correct any burnt out bulbs.
2. Repair or replace any faulty, worn or damaged body or suspension components that could hinder proper lamp
alignment.
3. Verify proper tire inflation pressures.
4. Remove any accumulations of mud, snow or ice from the vehicle underbody and clean the front lamp lenses.
8L - 74
LAMPS/LIGHTING - EXTERIOR - SERVICE INFORMATION
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