LAMPS
TABLE OF CONTENTS
page page
LAMP DIAGNOSIS ......................... 1
HEADLAMP ALIGNMENT .................... 8
LAMP BULB SERVICE ..................... 12
LAMP SERVICE........................... 18
BULB APPLICATION ....................... 25
LAMP DIAGNOSIS
TABLE OF CONTENTS
page page
DESCRIPTION AND OPERATION
LAMP SYSTEMS ..........................1
AUTOMATIC HEADLAMP SYSTEM ............1
COURTESY LAMPS........................2
DAYTIME RUNNING LAMPS – CANADA ONLY . . . 2
HEADLAMPS ON WITH WINDSHIELD WIPERS . . . 2
HEADLAMP SYSTEM.......................2
HEADLAMP TIME DELAY SYSTEM ............2
FLOOR CONSOLE TRANSMISSION RANGE
INDICATOR LAMP........................3
ILLUMINATED ENTRY ......................3
SAFETY PRECAUTIONS ....................3
DIAGNOSIS AND TESTING
HEADLAMP AND FOG LAMP DIAGNOSIS .......3
DESCRIPTION AND OPERATION
LAMP SYSTEMS
DESCRIPTION
LH vehicles use lighting on the interior and exte-
rior of the vehicle for illuminating and indicating
purposes. Lighting circuits are protected by fuses or
circuit breakers. Lighting circuits require an overload
protected power source, on/off device, lamps and body
ground to operate properly. Plastic lamp sockets
require a wire in the harness to supply body ground
to the lamp socket. Lamp sockets that are exposed to
moisture should be coated with Mopart Multi pur-
pose Grease or equivalent to avoid corrosion. If a
socket has become corroded, clean socket and bulb
base with abrasive fiber sanding pad or metallic bris-
tle brush. Replace sockets and bulbs that are
deformed from corrosion that could prevent a contin-
uous body ground.
Wire connectors can make intermittent contact or
become corroded. Before coupling wire connectors,
inspect the terminals inside the connector. Male ter-
minals should not be bent or disengaged from the
insulator. Female terminals should not be sprung
open or disengaged from the insulator. Bent and
sprung terminals can be repaired using needle nose
pliers and pick tool. Corroded terminals appear
chalky or green. Corroded terminals should be
replaced to avoid recurrence of the problem symp-
toms. Wire connector terminals should be coated with
Mopart Multi purpose Grease or equivalent to avoid
corrosion.
Begin electrical system failure diagnosis by testing
related fuses and circuit breakers in the fuse block
and engine compartment. Verify that bulbs are in
good condition and test continuity of the circuit
ground. Refer to Group 8W, Wiring Diagrams, for
component location and circuit information.
AUTOMATIC HEADLAMP SYSTEM
DESCRIPTION
The Automatic Headlamp system turns the instru-
mentation and exterior illumination lamps ON when
the ambient light levels are low and OFF when light
levels are high.
OPERATION
Automatic headlamps are controlled by the Body
Control Module (BCM). With the headlamp switch in
the AUTO position, the BCM will control the head-
lamp, parking, side marker, tail and instrumentation
LH LAMPS 8L - 1
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