Chrysler RAM TRUCK 2500 1994 Service Manual page 532

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WIRING DIAGRAMS 8W - 3
M A I N CIRCUIT IDENTIPICATION
CIRCUIT DESCRIPTION
A Battery Feed: Fused a n d Unfused
B A B S System
C
Air Conditioning System
D
CCD (+), CCD H
E Interior Lamp Illumination
F Battery Feed; Fused and Unfused
G Sensors, Sending Units, Switches
K Powertrain Central Module
L Exterior Lighting, Stop Lamp Switch
M Interior Lamps
refer to the wiring diagrams for the general location
of the component. Then use the component identifi­
cation index to locate the proper figure number.
SPLICE LOCATIONS
Splices are indicated in the wiring diagrams by a
diamond with splice circuit code within it (Fig. 6 ex­
ample 1). If there is more than one splice per circuit
splice code a small box will be connected to the dia­
mond with the splice number in it (Fig. 6 example 2).
To locate a splice in the wire harness, determine
the splice number from the wiring diagrams, then re­
fer to the splice location index. This section shows
the general location of the splice in the harness.
EXAMPLE 1 EXAMPLE 2
918W-18
Fig. 6 Wiring Splice Examples
CONNECTORS
The connectors shown in the diagram are viewed
from the terminal end unless otherwise specified. For
viewing bulkhead and engine controller connectors
refer to the back of the wiring diagrams. This area
shows major connectors for pin and cavity identifica­
tion.
TROUBLESHOOTING WIRING PROBLEMS
When troubleshooting wiring problems there are
six steps which can aid in the procedure. The steps
are listed and explained below.
CIRCUIT DESCRIPTION
P Power Assist System: Locks, Mirrors
Q Power Assist System: Windows
R Airbag System
S Air Suspension, Automatic Load Leveling
T Electronic Automatic Transaxle
V Windshield Wipers and Washers,
Vehicle Speed Control System
W Power Assist System: Windows
X Horn, Radio, Radio Speakers, Power Locks
Z Ground Circuits: Includes power and signal
grounds for PCM
938W-17
(1) Verify the problem.
(2) Verify any related symptoms. Perform opera­
tional checks on components in the same circuit as
the problem area. Refer to the wiring diagram fuse
application chart for circuit information.
(3) Analyze the symptoms. Use the wiring dia­
grams to determine what the circuit is doing, where
the problem most likely is occurring and where the
diagnosis will continue.
(4) Isolate the problem area.
(5) Repair the problem.
(6) Verify proper operation. For this step check for
proper operation of all items on the circuit repaired.
Refer to the wiring diagram fuse application chart.
WIRING REPAIR
When replacing or repairing a wire, it is important
that the correct gauge be used as shown in the wir­
ing diagrams. The wires must also be held securely
in place to prevent damage to the insulation.
(1) Disconnect battery negative cable.
(2) Remove 1 inch of insulation from each end the
wire.
(3) Place a piece of heat shrink tubing over one
side of the wire. Make sure the tubing will be long
enough to cover and seal the entire repair area.
(4) Spread the strands of the wire apart on each of
the exposed wires (Fig. 7 example 1).
(5) Push the two ends of wire together until the
strands of wire are close to the insulation (Fig. 7 ex­
ample 2).
(6) Twist the wires together (Fig. 7 example 3).
(7) Solder the connection together using rosin core
type solder only. Do not use acid core solder.