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8L - 2
LAMPS/LIGHTING - EXTERIOR
OPERATION - TURN SIGNAL SYSTEM . . . . . . . 18
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
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REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
INSTALLATION
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LAMPS/LIGHTING - EXTERIOR
DESCRIPTION
The exterior lighting system for this model include
the following components:
• Backup Lamps
• Brake Lamps
• Daytime Running Lamps
• Front Fog Lamps
• Hazard Warning Lamps
• Headlamps
• Park Lamps
• Turn Signal Lamps
Other components of the exterior lighting system
for this model include:
• Backup Lamp Switch
• Brake Lamp Switch
• Front Control Module
• Front Fog Lamp Relay
• Hazard Switch
• Multi-Function Switch
• Park Lamp Relay
• Trailer Tow Connectors
Some of the interior and exterior lighting functions
are governed by the front control module. The head-
lamp, dome, and door ajar switchs provide signals to
the instrument cluster. The instrument cluster sends
a J1850 message to the front control module to
enable the necessary components for illumination.
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INSTALLATION
. 18
REMOVAL - WITHOUT CARGO BOX
INSTALLATION
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
INSTALLATION
Hard wired circuitry connects the exterior lighting
system components to the electrical system of the
vehicle. Refer to the appropriate wiring information.
OPERATION
DAYTIME RUNNING LAMPS
Power is reduced using pulse-width modulation to
the high beams, where by the power is switched on
and off rapidly instead of remaining on continuously.
The duration and interval of the power pulses is pro-
grammed into the Front Control Module (FCM).
HEADLAMP SYSTEM
The instrument cluster monitors both the multi-
plexed headlamp and multifunction switches. The
instrument cluster transmits a J1850 bus message to
the front control module (FCM) to activate the head-
lamps. The headlamp system will default to head-
lamps ON position when ignition switch is ON and
when an open or short circuit failure occurs on the
headlamp switch input to the instrument cluster. The
system will return to normal operation when the
open or short is repaired. A fault will be reported by
the Instrument Cluster when a failure occurs on the
dimmer or headlamp switch input.
If the exterior lamps are ON, and the headlamp
switch is in any position other than OFF, with the
ignition switch OFF (LOCK) after 5 minutes, the
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DR
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