Jeep 1997 Grand Cherokee Service Manual page 507

ZG
GENERAL INFORMATION
AUTO HEADLAMP SENSOR
DAYTIME RUNNING LAMP SYSTEM . . . . . . . . 17
LAMP OUTAGE MODULE . . . . . . . . . . . . . . . . . 17
GENERAL INFORMATION
DAYTIME RUNNING LAMP SYSTEM
ZJ vehicles built for use in Canada are equipped
with a Daytime Running Lamp System (DRL). The
DRL system operates the headlamp at 50% illumina-
tion with the headlamp switch OFF, park brake
released and the ignition in the RUN position. The
DRL system is controlled by the Daytime Running
Lamp Module located in the engine compartment
attached to the Power Distribution Center (PDC)
bracket. The DRL module overides the headlamp
switch when the headlamps are turned OFF. The
headlamps operate normally when the headlamps are
turned ON.
LAMP OUTAGE MODULE
The Lamp Outage Module will indicate a tail lamp,
stop lamp, or a CHMSL bulb failure. A display will
illuminate in the Vehicle Information Center (VIC),
displaying the failure.
Details for the VIC can be found in Group 8E,
Vehicle Information Center. For circuit information,
refer to Group 8W, Wiring Diagrams.
The Lamp Outage Module is located behind the left
quarter trim panel.
Connecting trailer lights to the body harness at the
rear of the vehicle can cause damage to the lamp out-
age module. The lamp outage module is designed to
handle a 5 amp current load. This is adequate for the
operation of the vehicles lighting system. When addi-
tional lights are added to the system such as trailer
lights, the 5 amp limit can be exceeded. This can
cause failure of the lamp outage module.
If trailer towing is required and the vehicle is not
equipped with a trailer tow package, the MOPAR
accessory trailer towing harnesses are the only
approved method to provide additional trailer lights.
These harnesses are designed to provide current to
the trailer lights but bypass the lamp outage module.
AUTO HEADLAMP SENSOR
The auto headlamp sensor is the key sensor for the
auto headlamp system. The sensor needs real sun-
LAMP SYSTEMS
INDEX
page
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POWER DISTRIBUTION CENTER BRACKET
REMOVAL AND INSTALLATION
AUTO HEADLAMP SENSOR
DAYTIME RUNNING LIGHT MODULE
LAMP OUTAGE MODULE . . . . . . . . . . . . . . . . . 18
light to properly register the light level. When auto
headlamps are enabled indoors, the headlamps may
be turned on. The sensor is located in the center of
the defroster grille at the base of the windshield.
REMOVAL AND INSTALLATION
DAYTIME RUNNING LIGHT MODULE
REMOVAL
(1) Open hood.
(2) Disconnect electrical connector from module.
(3) Remove screws holding module to PDC bracket
(Fig. 1).
(4) Separate module from bracket.
Fig. 1 Daytime Running Lamp Module
INSTALLATION
(1) Reverse the removal procedures.
AUTO HEADLAMP SENSOR
REMOVAL
(1) Using a trim stick, gently pry defroster bezel
out of dash pad.
(2) Unplug auto headlamp sensor connector.
(3) Snap out sensor from bezel.
DAYTIME RUNNING MODULE LAMP
LAMPS 8L - 17
page
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