Page 625 of 2321

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 into
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 or moisture
²Wire insulation that has rubbed through causing
a short to ground
²Some or all of the wiring strands broken inside
of the insulation
²Wiring broken inside of the insulation
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 area.(6) Verify the proper operation. For this step,
check for proper operation of all items on the
repaired circuit. Refer to the wiring diagrams.
STANDARD PROCEDURE - TESTING FOR
VOLTAGE POTENTIAL
(1) Connect the ground lead of a voltmeter to a
known good ground (Fig. 5).
(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.
STANDARD 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. 6)
(3) Connect the other lead to the other end of the
circuit being tested. Low or no resistance means good
continuity.
STANDARD PROCEDURE - 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.
(3) Starting at the fuse block, wiggle the wiring
harness about six to eight inches apart and watch
the voltmeter/test lamp.
Fig. 4 PROBING TOOL
1 - SPECIAL TOOL 6801
2 - PROBING END
Fig. 5 Testing for Voltage Potential
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WIRING DIAGRAM INFORMATION (Continued)
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(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.
STANDARD PROCEDURE - TESTING FOR
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.
STANDARD PROCEDURE - TESTING FOR A
VOLTAGE DROP
(1) Connect the positive lead of the voltmeter to
the side of the circuit closest to the battery (Fig. 7).
(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.
Fig. 6 Testing for Continuity
1 - FUSE REMOVED FROM CIRCUIT
Fig. 7 Testing for Voltage Drop
RG8W-01 WIRING DIAGRAM INFORMATION8Wa-01-7
WIRING DIAGRAM INFORMATION (Continued)
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SPECIAL TOOLS
SPECIAL TOOLS - WIRING/TERMINALCONNECTOR - AUGAT
REMOVAL
(1) Disconnect battery.
(2) Disconnect the connector from its mating half/
component.
(3) Push down on the yellow connector locking tab
to release the terminals (Fig. 8).
(4) Using special tool 6932, push the terminal to
remove it from the connector (Fig. 9).
(5) Repair or replace the terminal as necessary.
INSTALLATION
(1) Reset the terminal locking tang.
PROBING TOOL PACKAGE 6807
TERMINAL PICK 6680
TERMINAL REMOVING TOOL 6932
TERMINAL REMOVING TOOL 6934
Fig. 8 AUGAT CONNECTOR REPAIR
1 - LOCKING TAB
2 - CONNECTOR
Fig. 9 USING SPECIAL TOOL 6932
1 - SPECIAL TOOL 6932
2 - CONNECTOR
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WIRING DIAGRAM INFORMATION (Continued)
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(2) Insert the removed wire in the same cavity on
the repair connector.
(3) Repeat steps for each wire in the connector,
being sure that all wires are inserted into the proper
cavities. For additional connector pin-out identifica-
tion, refer to the wiring diagrams.
(4) When the connector is re-assembled, the lock-
ing tab must be placed in the locked position to pre-
vent terminal push out.
(5) Connect connector to its mating half/compo-
nent.
(6) Connect battery and test all affected systems.
CONNECTOR - MOLEX
REMOVAL
(1) Disconnect battery.
(2) Disconnect the connector from its mating half/
component.
(3) Insert special tool 6742 into the terminal end of
the connector (Fig. 10).
(4) Using special tool 6742, release the locking fin-
gers on the terminal (Fig. 11).
(5) Pull on the wire to remove it from the connec-
tor.
(6) Repair or replace the terminal as necessary.
INSTALLATION
(1) Reset the terminal locking tang.
(2) Insert the removed wire in the same cavity on
the repair connector.
(3) Repeat steps for each wire in the connector,
being sure that all wires are inserted into the proper
cavities. For additional connector pin-out identifica-
tion, refer to the wiring diagrams.(4) Connect connector to its mating half/compo-
nent.
(5) Connect battery and test all affected systems.
CONNECTOR - THOMAS AND
BETTS
REMOVAL
(1) Disconnect battery.
(2) Disconnect the connector from its mating half/
component.
(3) Push in the two lock tabs on the side of the
connector (Fig. 12).
Fig. 10 MOLEX CONNECTOR REPAIR
1 - CONNECTOR
2 - SPECIAL TOOL 6742
Fig. 11 USING SPECIAL TOOL 6742
1 - CONNECTOR
2 - SPECIAL TOOL 6742
Fig. 12 THOMAS AND BETTS CONNECTOR LOCK
RELEASE TABS
1 - LOCK TABS
RG8W-01 WIRING DIAGRAM INFORMATION8Wa-01-9
CONNECTOR - AUGAT (Continued)
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(4) Insert the probe end of special tool 6934 into
the back of the connector cavity (Fig. 13).
(5) Grasp the wire and tool 6934, then slowly
remove the wire and terminal from the connector.
(6) Repair or replace the terminal as necessary.
INSTALLATION
(1) Reset the terminal locking tang.
(2) Insert the removed wire in the same cavity on
the repair connector.
(3) Repeat steps for each wire in the connector,
being sure that all wires are fully seated into the
proper cavities. For additional connector pin-out
identification, refer to the wiring diagrams.
(4) Push in the single lock tab on the side of the
connector (Fig. 14).
(5) Connect connector to its mating half/compo-
nent.
(6) Connect battery and test all affected systems.
DIODE
REMOVAL
(1) Disconnect the battery.
(2) Locate the diode in the harness, and remove
the protective covering.
(3) Remove the diode from the harness, pay atten-
tion to the current flow direction (Fig. 15).
INSTALLATION
(1) Remove the insulation from the wires in the
harness. Only remove enough insulation to solder in
the new diode.
(2) Install the new diode in the harness, making
sure current flow is correct. If necessary, refer to the
appropriate wiring diagram for current flow (Fig. 15).
(3) Solder the connection together using rosin core
type solder only.Do not use acid core solder.
(4) Tape the diode to the harness using electrical
tape. Make sure the diode is completely sealed from
the elements.
(5) Re-connect the battery and test affected sys-
tems.
Fig. 13 REMOVING WIRE TERMINAL
1 - SPECIAL TOOL 6934
Fig. 14 SINGLE LOCK TAB
1 - SINGLE LOCK TAB
Fig. 15 DIODE IDENTIFICATION
1 - CURRENT FLOW
2 - BAND AROUND DIODE INDICATES CURRENT FLOW
3 - DIODE AS SHOWN IN THE DIAGRAMS
8Wa - 01 - 10 8W-01 WIRING DIAGRAM INFORMATIONRG
CONNECTOR - THOMAS AND BETTS (Continued)
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TERMINAL
REMOVAL
(1) Disconnect battery.
(2) Disconnect the connector being repaired from
its mating half/component.
(3) Remove the connector locking wedge, if
required (Fig. 16).
(4) Position the connector locking finger away from
the terminal using the proper pick from special tool
kit 6680. Pull on the wire to remove the terminal
from the connector (Fig. 17) (Fig. 18).(5) Cut the wire 6 inches from the back of the con-
nector.
INSTALLATION
(1) Select a wire from the terminal repair assem-
bly that best matches the color wire being repaired.
(2) Cut the repair wire to the proper length and
remove one±half (1/2) inch of insulation.
(3) Splice the repair wire to the wire harness .
(4) Insert the repaired wire into the connector.
(5) Install the connector locking wedge, if required,
and reconnect the connector to its mating half/compo-
nent.
(6) Re-tape the wire harness starting at 1±1/2
inches behind the connector and 2 inches past the
repair.
(7) Connect battery and test all affected systems.
WIRE
STANDARD PROCEDURE - WIRE SPLICING
When splicing a wire, it is important that the cor-
rect gage be used as shown in the wiring diagrams.
(1) Remove one-half (1/2) inch of insulation from
each wire that needs to be spliced.
(2) Place a piece of adhesive lined heat shrink tub-
ing on one side of the wire. Make sure the tubing will
be long enough to cover and seal the entire repair
area.
(3) Place the strands of wire overlapping each
other inside of the splice clip (Fig. 19).
(4) Using crimping tool, Miller p/n 8272, crimp the
splice clip and wires together (Fig. 20)
Fig. 16 CONNECTOR LOCKING WEDGE TAB
(TYPICAL)
1 - CONNECTOR
2 - CONNECTOR LOCKING WEDGE TAB
Fig. 17 TERMINAL REMOVAL
1 - CONNECTOR
2 - FROM SPECIAL TOOL KIT 6680
Fig. 18 TERMINAL REMOVAL USING SPECIAL TOOL
1 - FROM SPECIAL TOOL KIT 6680
2 - CONNECTOR
RG8W-01 WIRING DIAGRAM INFORMATION8Wa-01-11
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Page 631 of 2321
(5) Solder the connection together using rosin core
type solder only (Fig. 21).
CAUTION: DO NOT USE ACID CORE SOLDER.(6) 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 (Fig. 22).
Fig. 19 SPLICE CLIP
Fig. 20 CRIMPING TOOL
Fig. 21 SOLDER
Fig. 22 HEAT SHRINK TUBING
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WIRE (Continued)
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8W-02 COMPONENT INDEX
Component Page
A/C Compressor Clutch Relay........... 8Wa-42
A/C Compressor Clutch................ 8Wa-42
A/C-Heater Control................... 8Wa-42
A/C Pressure Sensor.................. 8Wa-42
Accelerator Pedal Position Sensor........ 8Wa-30
Accessory Relay...................... 8Wa-10
Airbags............................. 8Wa-43
Ambient Temp Sensor................. 8Wa-49
Antenna............................ 8Wa-47
ATC Remote Sensor................... 8Wa-42
Auto Shut Down Relay................. 8Wa-30
Auto Temp Control.................... 8Wa-42
Automatic Day/Night Mirror............ 8Wa-49
Autostick Switch..................... 8Wa-31
Back-Up Lamp Switch................. 8Wa-51
Battery Temperature Sensor............ 8Wa-20
Battery............................. 8Wa-20
Blend Door Actuators.................. 8Wa-42
Blower Motor Resistor................. 8Wa-42
Body Control Module.................. 8Wa-45
Boost Pressure Sensor................. 8Wa-30
B-Pillar Switches..................... 8Wa-61
Brake Fluid Level Switch............... 8Wa-40
Brake Lamp Switch................... 8Wa-51
Brake Transmission Shift Interlock
Solenoid.......................... 8Wa-31
Cabin Heater Assist................... 8Wa-30
Camshaft Position Sensor.............. 8Wa-30
CD Changer......................... 8Wa-47
Center High Mounted Stop Lamp........ 8Wa-51
Cinch/Release Motors.................. 8Wa-61
Clockspring................. 8Wa-33, 41, 43, 47
Clutch Pedal Interlock Switch Jumper..... 8Wa-10
Clutch Pedal Interlock Switch........... 8Wa-10
Clutch Pedal Upstop Switch............. 8Wa-30
Combination Relays................... 8Wa-54
Controller Antilock Brake.............. 8Wa-35
Crank Case Ventilation Heater.......... 8Wa-30
Crankshaft Position Sensor............. 8Wa-30
Cylinder Lock Switches................ 8Wa-39
Data Link Connector.................. 8Wa-18
Defogger Relay....................... 8Wa-48
Diagnostic Junction Port............... 8Wa-18
Dome Lamps........................ 8Wa-44
Door Ajar Switches.................... 8Wa-39
Door Courtesy Lamps.................. 8Wa-44
Door Lock Motor/Ajar Switches.......... 8Wa-61
Door Lock Switches................... 8Wa-61
Dosing Pump........................ 8Wa-30
Driver Heated Seat Module............. 8Wa-63
ECM/PCM Relay..................... 8Wa-30
EGR Solenoid........................ 8Wa-30Component Page
Electric Wiper De-Icer................. 8Wa-48
Engine Control Module................ 8Wa-30
Engine Coolant Temp Sensor............ 8Wa-30
Engine Oil Pressure Sensor............. 8Wa-30
Engine Oil Pressure Switch............. 8Wa-30
Engine Oil Temperature Sensor.......... 8Wa-30
EVAP/Purge Solenoid.................. 8Wa-30
Evaporator Temperature Sensor......... 8Wa-42
Floor Console Lamp................... 8Wa-44
Floor Console Power Outlet............. 8Wa-41
Fog Lamps.......................... 8Wa-50
Front Blower Module.................. 8Wa-42
Front Blower Motor Relay.............. 8Wa-42
Front Blower Motor................... 8Wa-42
Front Cigar Lighter................... 8Wa-41
Front Control Module.................. 8Wa-10
Front Fog Lamp Relay................. 8Wa-50
Front Intrusion Sensor................. 8Wa-39
Front Reading Lamps/Switch............ 8Wa-44
Front Washer Pump Motor.............. 8Wa-53
Front Wiper Hi/Low Relay.............. 8Wa-53
Front Wiper On/Off Relay.............. 8Wa-53
Fuel Heater Relay.................... 8Wa-10
Fuel Heater......................... 8Wa-30
Fuel Injectors........................ 8Wa-30
Fuel Pressure Sensor.................. 8Wa-30
Fuel Pressure Solenoid................. 8Wa-30
Fuel Pump Module.................... 8Wa-30
Fuel Pump Relay..................... 8Wa-30
Full Open Switches................... 8Wa-61
Fuselink............................ 8Wa-10
Fuses (IPM)......................... 8Wa-10
Generator........................... 8Wa-20
Glove Box Lamp...................... 8Wa-44
Glow Plug Relay...................... 8Wa-30
Glow Plugs.......................... 8Wa-30
Grounds............................ 8Wa-15
Halo Lamp.......................... 8Wa-44
Headlamp Leveling Motors............. 8Wa-50
Headlamp Switch..................... 8Wa-50
Headlamp Washer Pump Motor.......... 8Wa-53
Headlamp Washer Relay............... 8Wa-53
Headlamps.......................... 8Wa-50
Heated Seat Backs.................... 8Wa-63
Heated Seat Cushions................. 8Wa-63
High Beam Lamps.................... 8Wa-50
Hood Ajar Switch..................... 8Wa-39
Horn Relay.......................... 8Wa-41
Horn Switch......................... 8Wa-41
Horns.............................. 8Wa-41
Idle Air Control Motor................. 8Wa-30
Ignition Coil......................... 8Wa-30
RG8W-02 COMPONENT INDEX8Wa-02-1
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