Dodge dakota 2002 Service Manual page 539

8L - 2 LAMPS/LIGHTING - EXTERIOR
MULTI-FUNCTION SWITCH
DESCRIPTION - TURN SIGNAL SYSTEM
OPERATION - TURN SIGNAL SYSTEM . . . . . . . 18
DIAGNOSIS AND TESTING - MULTI-
FUNCTION SWITCH
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 19
PARK LAMP RELAY
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 19
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DIAGNOSIS AND TESTING - PARK LAMP
RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 21
PARK/TURN SIGNAL LAMP
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 21
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.
Hard wired circuitry connects the exterior lighting
system components to the electrical system of the
vehicle. Refer to the appropriate wiring information.
. . . . . 17
. . . . . . . . . . . . . . . . . . . 18
TAIL LAMP
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 21
TAIL LAMP UNIT
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 21
TRAILER TOW WIRING
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . 22
TURN LAMP
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 22
UNDERHOOD LAMP
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 22
UNDERHOOD LAMP UNIT
REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . 23
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
Instrument Cluster transmits a message via J1850
informing the the FCM. The FCM will then turn off
the headlamps, park lamps and fog lamps. This fea-
ture (load shed) prevents the vehicle battery from
being discharged when the vehicle lights have been
left ON.
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
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