Dodge RAM TRUCK 1500 1995 Service Manual page 484

LAMPS IL - 1
LAMPS
JLB APPLICATION
IMP DIAGNOSIS .
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14
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SERfiCE PROCEDURES
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L A U P
DIAGNOSIS
IENERAL INFORMATION
BR 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 lamps require a
wire in the harness to supply body ground to the
lamp socket. Lamp sockets that are exposed to mois­
ture should be coated with Mopar, Multi-purpose
Grease or equivalent to avoid corrosion. If a socket
has become corroded, clean socket and bulb base with
abrasive fiber sanding pad or metallic bristle brush.
Replace sockets and bulbs that are deformed from
corrosion that could prevent continuous body ground.
Wire connectors can make intermittent contact or
become corroded. Before coupling wire connectors, in­
spect the terminals inside the connector. Male termi­
nals 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 re­
placed to avoid recurrence of the problem symptoms.
Wire connector terminals should be coated with MO­
PAR, 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.
S1FETY PRECAUTIONS
WARNING: E Y E PROTECTION SHOULD BE U S E D
W H E N SERVICING G L A S S COMPONENTS. P E R ­
SONAL INJURY CAN RESULT.
CAUTION: Do not touch the glass of halogen bulbs
with fingers or other possibly oily surface. Reduced
bulb life will result.
Do not use bulbs with higher candle power than
indicated in the Bulb Application table at the end of
this group. Damage to lamp can result.
. Do not use fuses, circuit breakers or relays hav­
ing greater amperage value than indicated on the
fuse panel or in the Owners Manual.
When it is necessary to remove components to ser­
vice another, it should not be necessary to apply ex­
cessive force or bend a component to remove it.
Before damaging a trim component, verify hidden
fasteners or captured edges are not holding the com­
ponent in place.
HEADLAMP DIAiNOSIS
BR vehicles built for use in Canada are equipped
with a Daytime Running Lamp (DRL) system. The
DRL system operates the highbeam headlamps at
50% illumination with the headlamp switch OFF and
the engine running. The DRL system is controlled by
the Daytime Running Lamp Module located on radi­
ator closure panel on the right side of the engine
compartment. The DRL module overrides the head­
lamp switch when the headlamps are turned OFF.
The headlamps operate normally when the head­
lamps are turned ON.
. When a vehicle experiences problems with the
headlamp system, verify the condition of the battery
connections, charging system, headlamp bulbs, wire
connectors, relay, high beam dimmer switch and
headlamp switch. Refer to Group 8W, Wiring Dia­
grams for component locations and circuit informa­
tion.
Always begin any diagnosis by testing all of the
fuses and circuit breakers in the system. Refer to
Group 8W, Wiring Diagrams.