
COMPASS MINI-TRIP COMPUTER (CMTC)
MODULE
REMOVAL
(1) Disconnect battery negative cable.
(2) Remove overhead console.
(3) Remove the six screws holding CMTC module
to overhead console (Fig. 6).
(4) Remove CMTC module from console.
INSTALLATION
For installation, reverse the above procedures.
COMPASS MINI-TRIP COMPUTER (CMTC) LAMP
BULBS
REMOVAL
(1) Remove overhead console.
(2) Rotate bulb socket counterclockwise one quar-
ter turn (Fig. 7).(3) Pull bulb socket from CMTC module.
INSTALLATION
For installation, reverse the above procedures.
FRONT HEADER READING/COURTESY LAMP
REMOVAL
(1) Place a small flat tool in the slot at the forward
edge of the lamp lens and twist (Fig. 8).
(2) Remove lens.
(3) Insert the tip of the tool under the inside, rear
edge of the reflector/light shield. Carefully pry reflec-
tor/light shield out.
(4) Remove the lamp by pressing forward the brass
terminal and rotating the lamp clockwise to remove.
INSTALLATION
For installation, reverse the above procedures.
When installing the lamp lens, first guide the switch
contact tab on the lens between the lamp switch
plunger and the lamp bezel. Then snap lens onto the
two lens pivots on the bezel.
OVERHEAD CONSOLE
REMOVAL
(1) Open the transmitter bin door (Fig. 9).
(2) Remove screw holding the overhead console to
the headliner. With the screw removed the console is
retained by one engagement tab located inside the
eyeglass storage bin.
(3) Open the eyeglass bin door.
(4) Press the retaining tab which is located
directly above the door latch.
(5) Lower rear of console away from headliner.
(6) Pull console rearward to disengage clips hold-
ing front of console to roof armature and lower con-
sole.
(7) Disconnect wire connectors from back of CMTC
and reading lamps. Ensure the connectors lock tabs
are fully depressed before disconnecting.
(8) Remove overhead console.
INSTALLATION
For installation, reverse the above procedures.
READING/COURTESY LAMP
Removal
(1) Using a trim stick, lightly pry outward the for-
ward end of reading lamp lens (Fig. 10).
(2) Rotate reading/courtesy lamp socket one quar-
ter turn counterclockwise.
(3) Pull socket out of lamp (Fig. 11).
(4) Pull lamp from socket.
Fig. 6 Compass Mini-Trip Computer
Fig. 7 CMTC Lamp Bulbs
8V - 6 OVERHEAD CONSOLENS
REMOVAL AND INSTALLATION (Continued)

Installation
For installation, reverse the above procedures.
When installing the lamp lens, first guide the switch
contact tab on the lens between the lamp switch
plunger and the lamp bezel. Then snap lens onto the
two lens pivots on the bezel.
READING/COURTESY LAMP ASSEMBLY
Removal
(1) Disconnect the battery negative cable.
(2) Remove the overhead console.
(3) Remove the screws holding the reading lamp to
the overhead console (Fig. 12).
(4) Remove the lamp from the overhead console.(5) Disconnect the wire connectors from the back
of the reading lamp (Fig. 13).
(6) Disconnect the reading lamp switch from the
keyhole slot in the reading lamp.
(7) Remove the reading lamp from the overhead
console.
Installation
For installation, reverse the above procedures.
UNIVERSAL TRANSMITTER
REMOVAL
The Universal Transmitter is serviced with the
transmitter bin door, in the overhead console.
Fig. 8 Lamp and Lens Removal
NSOVERHEAD CONSOLE 8V - 7
REMOVAL AND INSTALLATION (Continued)

(1) Disconnect and isolate negative battery cable.
(2) Open transmitter bin door in rear of overhead
console.(3) Gently pull towards rear of vehicle, releasing
transmitter bin door.
(4) Disconnect harness connector from Universal
Transmitter and remove bin door from vehicle.
INSTALLATION
For installation, reverse the above procedures. The
Universal Transmitter will need to be retrained.
Refer to SERVICE PROCEDURES in this section.
Fig. 9 Overhead Console
Fig. 10 Reading/Courtesy lamp lens
Fig. 11 Socket and Lamp
Fig. 12 Reading/Courtesy Lamp
Fig. 13 Connector and Switch
8V - 8 OVERHEAD CONSOLENS
REMOVAL AND INSTALLATION (Continued)

CIRCUIT INFORMATION
Each wire shown in the diagrams contains a code
which identifies the main circuit, part of the main
circuit, gage of wire, and color (Fig. 1).
CIRCUIT FUNCTIONS
All circuits in the diagrams use an alpha/numeric
code to identify the wire and its function. To identify
which circuit code applies to a system, refer to the
Circuit Identification Code Chart. This chart shows
the main circuits only and does not show the second-
ary codes that may apply to some models.
Fig. 1 Wire Code Identification
COLOR CODE COLORSTANDARD
TRACER
COLOR
BL BLUE WT
BK BLACK WT
BR BROWN WT
DB DARK BLUE WT
DG DARK GREEN WT
GY GRAY BK
LB LIGHT BLUE BK
LG LIGHT GREEN BK
OR ORANGE BK
PK PINK BK or WT
RD RED WT
TN TAN WT
VT VIOLET WT
WT WHITE BK
YL YELLOW BK
* WITH TRACER
CIRCUIT FUNCTION
A BATTERY FEED
B BRAKE CONTROLS
C CLIMATE CONTROLS
D DIAGNOSTIC CIRCUITS
E DIMMING ILLUMINATION CIRCUITS
F FUSED CIRCUITS
G MONITORING CIRCUITS (GAUGES)
H OPEN
I NOT USED
J OPEN
K POWERTRAIN CONTROL MODULE
L EXTERIOR LIGHTING
M INTERIOR LIGHTING
N NOT USED
O NOT USED
P POWER OPTION (BATTERY FEED)
Q POWER OPTIONS (IGNITION FEED)
R PASSIVE RESTRAINT
S SUSPENSION/STEERING
T TRANSMISSION/TRANSAXLE/
TRANSFER CASE
U OPEN
V SPEED CONTROL, WIPER/WASHER
W OPEN
X AUDIO SYSTEMS
Y OPEN
Z GROUNDS
8W - 01 - 4 8W-01 GENERAL INFORMATIONNS/GS
DESCRIPTION AND OPERATION (Continued)

WARNING: BE SURE THAT THE IGNITION SWITCH
ALWAYS IS IN THE OFF POSITION, UNLESS THE
PROCEDURE REQUIRES IT TO BE ON.
WARNING: SET THE PARKING BRAKE WHEN
WORKING ON ANY VEHICLE. AN AUTOMATIC
TRANSMISSION SHOULD BE IN PARK. A MANUAL
TRANSMISSION SHOULD BE IN NEUTRAL.
WARNING: OPERATE THE ENGINE ONLY IN A
WELL-VENTILATED AREA.
WARNING: KEEP AWAY FROM MOVING PARTS
WHEN THE ENGINE IS RUNNING, ESPECIALLY THE
FAN AND BELTS.
WARNING: TO PREVENT SERIOUS BURNS, AVOID
CONTACT WITH HOT PARTS SUCH AS THE RADIA-
TOR, EXHAUST MANIFOLD(S), TAIL PIPE, CATA-
LYTIC CONVERTER, AND MUFFLER.
WARNING: DO NOT ALLOW FLAME OR SPARKS
NEAR THE BATTERY. GASES ARE ALWAYS
PRESENT IN AND AROUND THE BATTERY.
WARNING: ALWAYS REMOVE RINGS, WATCHES,
LOOSE HANGING JEWELRY, AND LOOSE CLOTH-
ING.
TAKE OUTS
The abbreviation T/O is used in the component
location section to indicate a point in which the wir-
ing harness branches out to a component.
ELECTROSTATIC DISCHARGE (ESD) SENSITIVE
DEVICES
All ESD sensitive components are solid state and a
symbol (Fig. 4) is used to indicate this. When han-
dling any component with this symbol comply with
the following procedures to reduce the possibility of
electrostatic charge build up on the body and inad-
vertent discharge into the component. If it is not
known whether the part is ESD sensitive, assume
that it is.
(1) Always touch a known good ground before han-
dling the part. This should be repeated while han-
dling the part and more frequently after sliding
across a seat, sitting down from a standing position,
or walking a distance.
(2) Avoid touching electrical terminals of the part,
unless instructed to do so by a written procedure.(3) When using a voltmeter, be sure to connect the
ground lead first.
(4) Do not remove the part from its protective
packing until it is time to install the part.
(5) Before removing the part from its package,
ground the package to a known good ground on the
vehicle.
POSITIVE TEMPERATURE COEFFICIENT
Positive Temperature Coefficient (PTC) devices are
being used for circuit protection. These PTC's act like
a solid state fuse. They are located in the junction
block, and are used to protect such items as: power
door lock motors, power windows, and various engine
solenoids.
A special symbol is used to identify these in the
wiring diagrams (Fig. 5).
DIAGNOSIS AND TESTING
TROUBLESHOOTING TOOLS
When diagnosing a problem in an electrical circuit
there are several common tools necessary. These tools
are listed and explained below.
²Jumper Wire - This is a test wire used to con-
nect two points of a circuit. It can be used to bypass
an open in a circuit.
WARNING: NEVER USE A JUMPER WIRE ACROSS
A LOAD, SUCH AS A MOTOR, CONNECTED
BETWEEN A BATTERY FEED AND GROUND.
Fig. 4 Electrostatic Discharge Symbol
Fig. 5 Positive Temperature Coefficient Symbol
8W - 01 - 8 8W-01 GENERAL INFORMATIONNS/GS
DESCRIPTION AND OPERATION (Continued)

²Voltmeter - Used to check for voltage on a cir-
cuit. Always connect the black lead to a known good
ground and the red lead to the positive side of the
circuit.
CAUTION: Most of the electrical components used
in today's vehicle are solid state. When checking
voltages in these circuits use a meter with a 10-me-
gohm or greater impedance rating.
²Ohmmeter - Used to check the resistance
between two points of a circuit. Low or no resistance
in a circuit means good continuity.
CAUTION: - Most of the electrical components used
in today's vehicle are Solid State. When checking
resistance in these circuits use a meter with a 10-
megohm or greater impedance rating. In addition,
make sure the power is disconnected from the cir-
cuit. Circuits that are powered up by the vehicle
electrical system can cause damage to the equip-
ment and provide false readings.
²Probing Tools - These tools are used for probing
terminals in connectors (Fig. 6). Select the proper
size tool from Special Tool Package 6807, and insert
it into the terminal being tested. Use the other end
of the tool to insert the meter probe.
INTERMITTENT AND POOR CONNECTIONS
Most intermittent electrical problems are caused
by faulty electrical connections or wiring. It is also
possible for a sticking component or relay to cause a
problem. Before condemning a component or wiring
assembly check the following items.
²Connectors are fully seated
²Spread terminals, or terminal push out
²Terminals in the wiring assembly are fully
seated into the connector/component and locked in
position
²Dirt or corrosion on the terminals. Any amount
of corrosion or dirt could cause an intermittent prob-
lem
²Damaged connector/component casing exposing
the item to dirt and moisture²Wire insulation that has rubbed through causing
a short to ground
²Some or all of the wiring strands broken inside
of the insulation covering.
²Wiring broken inside of the insulation
TROUBLESHOOTING TESTS
Before beginning any tests on a vehicles electrical
system use the Wiring Diagrams and study the cir-
cuit. Also refer to the Troubleshooting Wiring Prob-
lems in this section.
TESTING FOR VOLTAGE POTENTIAL
(1) Connect the ground lead of a voltmeter to a
known good ground (Fig. 7).
(2) Connect the other lead of the voltmeter to the
selected test point. The vehicle ignition may need to
be turned ON to check voltage. Refer to the appropri-
ate test procedure.
TESTING FOR CONTINUITY
(1) Remove the fuse for the circuit being checked
or, disconnect the battery.
(2) Connect one lead of the ohmmeter to one side
of the circuit being tested (Fig. 8).
(3) Connect the other lead to the other end of the
circuit being tested. Low or no resistance means good
continuity.
TESTING FOR A SHORT TO GROUND
(1) Remove the fuse and disconnect all items
involved with the fuse.
(2) Connect a test light or a voltmeter across the
terminals of the fuse.
Fig. 6 Probing Tool
Fig. 7 Testing for Voltage Potential
NS/GS8W-01 GENERAL INFORMATION 8W - 01 - 9
DIAGNOSIS AND TESTING (Continued)

(3) Starting at the fuse block, wiggle the wiring
harness about six to eight inches apart and watch
the voltmeter/test lamp.
(4) If the voltmeter registers voltage or the test
lamp glows, there is a short to ground in that gen-
eral area of the wiring harness.
TESTING FOR A SHORT TO GROUND ON
FUSES POWERING SEVERAL LOADS
(1) Refer to the wiring diagrams and disconnect or
isolate all items on the suspected fused circuits.
(2) Replace the blown fuse.
(3) Supply power to the fuse by turning ON the
ignition switch or re-connecting the battery.
(4) Start connecting the items in the fuse circuit
one at a time. When the fuse blows the circuit with
the short to ground has been isolated.
TESTING FOR A VOLTAGE DROP
(1) Connect the positive lead of the voltmeter to
the side of the circuit closest to the battery (Fig. 9).
(2) Connect the other lead of the voltmeter to the
other side of the switch or component.
(3) Operate the item.
(4) The voltmeter will show the difference in volt-
age between the two points.
TROUBLESHOOTING WIRING PROBLEMS
When troubleshooting wiring problems there are
six steps which can aid in the procedure. The steps
are listed and explained below. Always check for non-
factory items added to the vehicle before doing any
diagnosis. If the vehicle is equipped with these items,disconnect them to verify these add-on items are not
the cause of the problem.
(1) Verify the problem.
(2) Verify any related symptoms. Do this by per-
forming operational checks on components that are
in the same circuit. Refer to the wiring diagrams.
(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 repaired circuit.
Refer to the wiring diagrams.
SERVICE PROCEDURES
WIRING REPAIR
When replacing or repairing a wire, it is important
that the correct gage be used as shown in the wiring
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 of
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
part of the exposed wire (example 1). (Fig. 10)
Fig. 8 Testing for ContinuityFig. 9 Testing for Voltage Drop
8W - 01 - 10 8W-01 GENERAL INFORMATIONNS/GS
DIAGNOSIS AND TESTING (Continued)

(5) Push the two ends of wire together until the
strands of wire are close to the insulation (example
2) (Fig. 10)
(6) Twist the wires together (example 3) (Fig. 10)
(7) Solder the connection together using rosin core
type solder only.Do not use acid core solder.
(8) Center the heat shrink tubing over the joint,
and heat using a heat gun. Heat the joint until the
tubing is tightly sealed and sealant comes out of both
ends of the tubing.
(9) Secure the wire to the existing ones to prevent
chafing or damage to the insulation
(10) Connect battery and test all affected systems.
TERMINAL/CONNECTOR REPAIR-MOLEX
CONNECTORS
(1) Disconnect battery.
(2) Disconnect the connector from its mating half/
component.
(3) Insert the terminal releasing special tool 6742
into the terminal end of the connector (Fig. 11).
(4) Using special tool 6742 release the locking fin-
gers on the terminal (Fig. 12).
(5) Pull on the wire to remove it from the connec-
tor.
(6) Repair or replace the connector or terminal, as
necessary.
CONNECTOR REPLACEMENT
(1) Disconnect battery.
(2) Disconnect the connector that is to be repaired
from its mating half/component(3) Remove the connector locking wedge, if
required (Fig. 13)
(4) Position the connector locking finger away from
the terminal using the proper pick from special tool
Fig. 10 Wire Repair
Fig. 11 Molex Connector Repair
Fig. 12 Using Special Tool 6742
Fig. 13 Connector Locking Wedge
NS/GS8W-01 GENERAL INFORMATION 8W - 01 - 11
SERVICE PROCEDURES (Continued)