window JEEP XJ 1995 Service And Owner's Guide

INTERIOR LIGHTING
INDEX
page page
Cargo Lamp and Dome Lamp................. 1
Chime/Buzzer Module....................... 2
Diagram Index............................ 2
General Information........................ 1
Glove Box Lamp........................... 1Ignition Switch Lamp........................ 1
Instrument Panel Illumination Lamps............ 1
Reading Lamps........................... 1
Underhood Lamp.......................... 1
Visor Vanity Mirror Lamps.................... 1
GENERAL INFORMATION
Circuit M1 supplies power to the glove box lamp,
dome lamp, reading lamps, cargo lamp and vanity
lamps. Circuit M1 is protected by fuse 16 in the
Power Distribution Center (PDC).
Circuit E2 supplies power for the instrument panel
illumination lamps.
INSTRUMENT PANEL ILLUMINATION LAMPS
Circuit E2 from the headlamp switch splices to
supply power to the following illumination lamps:
²Ash receiver lamp
²Cigar lighter lamp
²Transmission range indicator lamp
²Transfer case range indicator lamp
²A/C-Heater switch lamp
²Heated rear window switch lamp
²Rear wiper switch lamp
²Fog lamp switch lamp
Fuse 25 in the fuse block protects circuit E2. Cir-
cuit Z1 provides ground for all of the illumination
lamps except for the cigar lighter lamp. The cigar
lighter lamp is case grounded.
HELPFUL INFORMATION
Circuit E2 also supplies power to the radio, LCD
relay and the illumination lamps in the instrument
cluster.
IGNITION SWITCH LAMP
Circuit M50 supplies voltage to the ignition switch
lamp. Circuit Z1 provides ground for the lamp.
GLOVE BOX LAMP
Circuit M1 from fuse 16 in the Power Distribution
Center (PDC) powers the glove box lamp. A case
grounded switch, in series after the lamp, closes
when the glove box door is opened. The switch com-
pletes a path to ground on circuit Z1.
CARGO LAMP AND DOME LAMP
Circuit M1 from fuse 16 in the Power Distribution
Center (PDC) supplies power to the cargo lamp anddome lamp. The M1 circuit is HOT at all times. The
ground path for the lamp is provided in three differ-
ent ways.
One way is through the door jamb switches. Circuit
M2 connects to the door jamb switches to the dome
lamp and cargo lamp. The switches are connected to
ground circuit Z1. When a door is opened, the
plunger in the switch closes, completing a path to
ground.
The second way is through the liftgate switch. Cir-
cuit G71 connects to circuit M2 at the cargo lamp
connector. Circuit G71 connects to the liftgate switch.
The liftgate switch connects to ground circuit Z1.
When the lift gate opens, the plunger in the switch
closes, completing a path to ground.
The third ground path is through the headlamp
switch. Circuit M2 is spliced in with the headlamp
switch. When the operator turns the headlamp
switch to the dome lamp ON position, a ground path
is provided through the switch.
READING LAMPS
Circuit M1 from fuse 16 in the Power Distribution
Center (PDC) supplies power to the reading lamps.
Circuit M1 is HOT at all times. When the operator
depresses the reading lamp, the reading lamp switch
closes and supplies ground on circuit Z1.
VISOR VANITY MIRROR LAMPS
Circuit M1 from fuse 16 in the Power Distribution
Center (PDC) supplies power to the vanity lamps.
Circuit M1 is HOT at all times. When the vanity
lamps switch closes, voltage flows to vanity mirror
lamps. The vanity mirror is case grounded.
UNDERHOOD LAMP
Circuit A7 from fuse 16 in the Power Distribution
Center (PDC) supplies battery voltage for the under-
hood lamp. A mercury switch, in series after the
lamp, connects the lamp to ground on circuit Z1.
When the hood is raised, mercury inside the switch
moves to a position where it connects circuit M1 to
ground circuit Z1, illuminating the lamp.
J8W-44 INTERIOR LIGHTINGÐXJ-RHD 8W - 44 - 1

HEATED REAR WINDOW
HEATED REAR WINDOW
The heated rear window relay supplies power to
heated rear window grid. Circuit F83 from fuse 14 in
the fuse block supplies power to the heated rear win-
dow relay when the ignition switch is in the ACCES-
SORY OR RUN positions.
When the operator depresses the heated rear win-
dow switch, the contacts inside the switch momen-
tarily close and circuit C80 connects the switch to the
relay. This causes the relay to change state and com-
plete a circuit to energize the coil side of the relay
and start the relay timer.
Circuit F82 from fuse 7 in the Power Distribution
Center (PDC) supplies voltage to the coil and contact
sides of the relay. Circuit Z1 provides ground for the
relay.
When the heated rear window relay energizes, the
contacts inside the relay close and connect circuit
F82 to circuit C15. Circuit C15 splices to the power
the heated rear window grid and the indicator lamp
in the heated rear window switch. Circuit Z1 pro-
vides ground for the heated rear window grid.
HELPFUL INFORMATION
²When the ignition switch is in the ACCESSORY or
RUN positions, it connects circuit A1 from fuse 11 in
the power distribution center (PDC) to circuit A48.
²Check for broken grid lines on the window.
²Check for a broken bus bar or disconnected leads
at the rear window.
²Check for a good ground.
DIAGRAM INDEX
Component Page
Fuse 2 (Fuse Block).......................8W-48-2
Fuse 6 (PDC)...........................8W-48-2
Fuse 7 (PDC)...........................8W-48-2
Fuse 14 (Fuse Block)......................8W-48-2
Ignition Switch..........................8W-48-2
Heated Rear Window Grid...................8W-48-3
Heated Rear Window Relay..................8W-48-2
Heated Rear Window Switch.................8W-48-2
J8W-48 HEATED REAR WINDOWÐXJ-RHD 8W - 48 - 1

POWER WINDOWS
INDEX
page page
Diagram Index............................ 2
Helpful Information......................... 2Power Windows........................... 1
POWER WINDOWS
When the ignition switch is in the ACCESSORY or
RUN position, it connects circuit A1 from fuse 6 in
the Power Distribution Center (PDC) to circuit A48.
Circuit A48 powers circuit F81 through fuse 12 in the
fuse block. Circuit F81 supplies voltage to the power
window system.
Circuit F81 connects to the master window switch.
Circuit Z1 provides ground for the power windows.
A LOCK-OUT feature is provided on the driver's
door window switch. When this feature is engaged
the other windows in the system will not operate.
RIGHT FRONT WINDOW OPERATION
When the operator selects window DOWN opera-
tion power is supplied on the F81 circuit through the
switch to circuit Q12. Circuit Q12 goes from the
switch to the power window motor. Ground for the
motor is supplied on the Q22 circuit back to the
switch. A bus bar, internal to the switch, connects the
Q22 circuit to the Z1 circuit.
For window UP operation the circuits are reversed.
Circuit Q22 is the feed, and circuit Q12 is the
ground.
LEFT FRONT WINDOW OPERATION
When the DRIVER selects window DOWN opera-
tion, power is supplied on the F81 circuit through the
switch to circuit Q26.
Circuit Q26 goes from the drivers door switch to
the left front door switch. Power is passed through
this switch to circuit Q21. The Q21 circuit then goes
to the right front window motor.
Ground for the window motor is supplied on the
Q11 circuit back to the right door switch. Circuity in-
ternal to the switch then passes the ground to circuit
Q16. Circuit Q16 goes from the right front door
switch to the master switch. A bus bar, internal to
the switch, connects the Q16 circuit to the Z1 circuit.
For window UP operation the circuits are reversed.
Circuits Q16 and Q11 are the feeds, and circuits Q21
and Q26 are the grounds.
If the switch is being operated from the PASSEN-
GER'S front door, and the operator is requesting win-
dow DOWN operation, power is supplied on the Q1
circuit from the driver's master switch circuit
through the switch to the Q21 circuit.Ground for the motor is supplied on the Q11 circuit
through the switch and back to the master switch on
circuit Q16. A bus bar, internal to the switch, con-
nects the Q16 circuit to the Z1 circuit.
For window UP operation, the circuits are reversed.
Circuit Q11 is the power and circuit Q21 is the
ground.
LEFT REAR WINDOW
When the DRIVER selects window DOWN opera-
tion power is supplied on the F81 circuit through the
switch to circuit Q17.
Circuit Q17 goes from the drivers door switch to
the left rear door power window switch. Power is
passed through the switch to circuit Q22. The Q22
circuit then goes to the left rear window motor.
Ground for the window motor is supplied on the
Q12 circuit back to the left rear door switch. Circuity
internal to the switch then passes the ground to cir-
cuit Q27. Circuit Q27 goes from the left rear door
switch to the master switch. A bus bar, internal to
the switch, connects the Q27 circuit to the Z1 circuit.
For window UP operation the circuits are reversed.
Circuits Q27 and Q12 are the feeds, and circuits Q22
and Q17 are the grounds.
If the switch is being operated from the LEFT
REAR door, and the operator is requesting window
DOWN operation, power is supplied on the Q1 circuit
from the driver's master switch circuit through the
switch to the Q22 circuit.
Ground for the motor is supplied on the Q12 circuit
through the switch and to circuit Q27. Circuit Q27
connects to the master window switch. A bus bar, in-
ternal to the switch, connects the Q27 circuit to the
Z1 circuit.
For window UP operation, the circuits are reversed.
Circuit Q12 is the power and circuits Q22, and Q17
are the grounds.
RIGHT REAR WINDOW
When the DRIVER selects window DOWN opera-
tion, power is supplied on the F81 circuit through the
switch to circuit Q18.
Circuit Q18 goes from the drivers door switch to
the right rear door window switch connector. Power
is passed through this switch to circuit Q22. The Q22
circuit then goes to the right rear window motor.
J8W-60 POWER WINDOWSÐXJ-RHD 8W - 60 - 1

Ground for the window motor is supplied on the
Q12 circuit back to the right rear door switch. Circu-
ity internal to the switch then passes the ground to
circuit Q28. Circuit Q28 goes from the right rear door
switch to the master switch. A bus bar, internal to
the switch, connects the Q28 circuit to the Z1 circuit.
For window UP operation the circuits are reversed.
Circuits Q28 and Q12 are the feeds, and circuits Q22,
Q33 and Q18 are the grounds.
If the switch is being operated from the RIGHT
REAR door, and the operator is requesting window
DOWN operation, power is supplied on the Q1 circuit
from the driver's master switch circuit through the
switch to the Q22 circuit.
Ground for the motor is supplied on the Q12 circuit
through the switch and back to the master switch on
circuit Q28. A bus bar, internal to the switch, con-
nects the Q28 circuit to the Z1 circuit.For window UP operation, the circuits are reversed.
Circuit Q12 is the power and circuits Q22 and Q18
are the ground.
HELPFUL INFORMATION
Refer to the appropriate group of the Service Man-
ual for test procedures.
DIAGRAM INDEX
Component Page
Fuse 6 (PDC)...........................8W-60-3
Fuse 12 (Fuse Block)......................8W-60-3
Ignition Switch..........................8W-60-3
Power Window Door Switches................8W-60-4
Power Window Master Switch................8W-60-3
Power Window Motors.....................8W-60-4
8W - 60 - 2 8W-60 POWER WINDOWSÐXJ-RHDJ

POWER MIRRORS
INDEX
page page
Diagram Index............................ 1
Heater Elements........................... 1Power Mirrors............................. 1
POWER MIRRORS
Four switches operates the left and right power
mirrors. One switch selects right or left mirror. Each
mirror has two motors; a LEFT/RIGHT motor and a
UP/DOWN motor. The motors switch polarity to al-
low mirror adjustment.
Circuit A7 from fuse 13 in the Power Distribution
Center (PDC) supplies battery voltage to fuse 8 in
the fuse block. Fuse 8 supplies voltage to circuit P60.
Circuit P60 powers the power mirror switch. Circuit
Z1 connects to the power mirror switch and supplies
ground for the power mirror system.
RIGHT POWER MIRROR OPERATION
In the right position, the power mirror switch sup-
plies power to the right mirror LEFT/RIGHT motor
on circuit P79 when a rightward adjustment is made.
Circuit P77 provides the ground path the for right-
ward adjustments.
When the operator makes leftward adjustment, po-
larity reverses. For leftward adjustments, the switch
supplies battery voltage to the right mirror LEFT/
RIGHT motor on circuit P77. Circuit P79 supplies
ground for leftward adjustments.
During upward adjustments, the switch supplies
voltage to the right mirror UP/DOWN motor on cir-
cuit P79. Circuit P80 supplies ground during upward
adjustments.
For downward adjustments, the polarity is re-
versed, the switch powers the right mirror UP/
DOWN motor on circuit P80. Circuit P79 supplies the
ground path.
LEFT POWER MIRROR OPERATION
In the left position, the power mirror switch sup-
plies power to the left mirror LEFT/RIGHT motor on
circuit P79 when a rightward adjustment is made.
Circuit P81 provides the ground path the for right-
ward adjustments.
When the operator makes leftward adjustment, po-
larity reverses. For leftward adjustments, the switch
supplies battery voltage the left mirror LEFT/RIGHT
motor on circuit P81. Circuit P79 supplies ground for
leftward adjustments.
During upward adjustments, the switch supplies
voltage to the left mirror UP/DOWN motor on circuit
P79. Circuit P78 supplies ground during upward ad-
justments.For downward adjustments, the polarity is re-
versed, the switch powers the left mirror UP/DOWN
motor on circuit P78. Circuit P79 supplies the ground
path.
HELPFUL INFORMATION
²Check fuse 3 in the PDC and fuse 8 in the fuse
block in the PDC
HEATER ELEMENTS
The heated rear window relay powers the heater
elements in power mirrors. When the relay energizes,
it supplies power to the heater elements on circuit
C15. Circuit Z1 provides ground for the power mirror
heater elements.
HELPFUL INFORMATION
²Circuit F82 from fuse 2 in the fuse block powers
circuit C15 when the heated rear window relay ener-
gizes.
²Circuit A4 from fuse 7 in the Power Distribution
Center (PDC) supplies battery voltage to the fuse
block for fuse 2 and circuit F85.
²Check fuse 2 in the fuse block.
²Check fuse 7 in the PDC.
DIAGRAM INDEX
Component Page
Fuse 1 (Fuse Block).......................8W-63-2
Fuse 3 (PDC)...........................8W-63-2
Power Seat............................8W-63-2
Power Seat Switch.......................8W-63-2
Fuse 2 (Fuse Block).......................8W-62-3
Fuse 3 (PDC)...........................8W-62-2
Fuse 7 (Fuse Block).......................8W-62-2
Fuse 7 (PDC)...........................8W-62-3
Fuse 8 (Fuse Block).......................8W-62-2
Fuse 16 (PDC)..........................8W-62-2
Heated Rear Window Relay..................8W-62-3
Power Mirrors..........................8W-62-2
Power Mirror Heater Elements................8W-62-3
Power Mirror Switch......................8W-62-2
J8W-62 POWER MIRRORSÐXJ-RHD 8W - 62 - 1

SPLICE LOCATIONS
GENERAL INFORMATION
This section provides illustrations identifying the
general location of the splices in this vehicle. A spliceindex is provided. Use the wiring diagrams in each
section for splice number identification. Refer to the
index for the proper splice number.
SPLICE LOCATIONS
Splice
NumberLocations Fig.
S101......InT/OforHorn and Radiator Fan Motor....2
S102......Before T/O for A/C Low Pressure Switch....2
S103......Before T/O for A/C Low Pressure Switch....2
S104......After T/O for A/C Low Pressure Switch.....2
S105......After T/O for A/C Low Pressure Switch.....2
S106......Before T/O for MAP Sensor............2
S107......Before T/O for MAP Sensor............2
S108......Before T/O for Injector No. 4...........4
S109......Before T/O for Injector No. 6...........4
S110......After T/O for MAP Sensor.............2
S111......After T/O for MAP Sensor.............2
S112......After T/O for Injectors................3
S113......After T/O for Injectors................3
S114......Before T/O for Brake Warning Switch......3
S115......Before T/O for Brake Warning Switch......3
S116......Before T/O for Brake Warning Switch......3
S117......InT/OforDash Connectors, Before Grommet .3
S118......InT/OforDash Connectors, Before Grommet .3
S119......InT/OforABSControl Module, After Grommet .5
S120......After T/O for Underhood Lamp..........3
S121......Before T/O for PDC..................3
S122......Before T/O for PDC..................3
S123......Before T/O for Ambient Air Temperature
Sensor........................3
S124......Near T/O for Ignition Coil and Generator....4
S125......After T/O for Left Fog Lamp............1
S126......Near Clip for Middle of Gille Opening......1
S127......Before T/O for Right Fog Lamp..........1
S201......Before T/O for Right Door Speaker (With ABS) .6
S201......Before T/O for Right Door Speaker (Without ABS)
...............................6
S202......Before T/O for Right Door Speaker (With ABS) .6
S202......Before T/O for Right Door Speaker
(Without ABS)....................6
S203......After T/O for Right Door Jamb Switch (With
ABS)...........................6
S204......Before T/O for Stop Lamp Switch (With ABS) .6
S205......Before T/O for Stop Lamp Switch (With ABS) .6
S205......Before T/O for Stop Lamp Switch (Without ABS)
...............................6
S206......Before T/O for Stop Lamp Switch (With ABS) .6
S206......After T/O for Heated Rear Window Switch and
Fog Lamp Switch (Without ABS).........6
S207......Before T/O for Headlamp Switch (With ABS) .6
S208......InT/OforHeated Rear Window Switch and Fog
Lamp Switch (With ABS)..............6Splice
NumberLocations Fig.
S208......Before T/O for Headlamp Switch
(Without ABS)....................6
S209......After T/O for Heated Rear Window Switch
and Fog Lamp Switch (With ABS).......6
S209......After T/O for Right Door Jamb Switch
(Without ABS)....................6
S210......After T/O for Heated Rear Window Switch and
Fog Lamp Switch (With ABS)...........6
S210......Before T/O for Headlamp Switch
(Without ABS)....................6
S211......After T/O for Antenna (With ABS)........6
S211......After T/O for A/C-Heater Mode Switch
(Without ABS)....................6
S212......InT/OforRelay Center (With ABS).......6
S212......InT/OforRelay Center (Without ABS).....6
S213......InT/OforRelay Center (With ABS).......6
S214......After T/O for Wiper Switch (With ABS).....6
S214......After T/O for A/C-Heater Mode Switch
(Without ABS)...................6
S215......After T/O for A/C-Heater Blower Motor
Switch (With ABS).................6
S216......After T/O for A/C-Heater Mode Switch
(With ABS)......................6
S216......After T/O for A/C-Heater Blower Motor
Switch (Without ABS)...............6
S217......After T/O for A/C-Heater Mode Switch
(With ABS)......................6
S217......After T/O for A/C-Heater Mode Switch
(Without ABS)....................6
S218......After T/O for A/C-Heater Mode Switch
(With ABS).....................6
S218......InT/OforRelay Center (Without ABS).....6
S219......After T/O for Glove Box (With ABS).......6
S220......After T/O for A/C-Heater Mode Switch
(With ABS)......................6
S220......After T/O for A/C-Heater Mode Switch
(Without ABS)....................6
S221......After T/O for Blower Motor Resistor Block
(With ABS)......................6
S222......Before T/O for Stop Lamp Switch
(Without ABS)....................6
S223......After T/O for Heated Rear Window Switch
and Fog Lamp Switch (Without ABS).....6
S224......After T/O for Glove Box (Without ABS).....6
S301......Bottom of Left Front Door Opening.......9
S302......Bottom of Left Front Door Opening.......9
S303......Bottom of Left Front Door Opening.......9
S304......Bottom of Left Front Door Opening.......9
J8W-95 SPLICE LOCATIONSÐXJ-RHD 8W - 95 - 1

WIRING DIAGRAMS
CONTENTS
page page
8W-01 GENERAL INFORMATIONÐWIRING
DIAGRAMS...................... 8W-01-1
8W-10 FUSE/FUSE BLOCK........... 8W-10-1
8W-11 POWER DISTRIBUTION........ 8W-11-1
8W-15 GROUND DISTRIBUTION....... 8W-15-1
8W-20 CHARGING SYSTEM.......... 8W-20-1
8W-21 STARTING SYSTEM........... 8W-21-1
8W-30 FUEL/IGNITION.............. 8W-30-1
8W-31 TRANSMISSION CONTROLS.... 8W-31-1
8W-32 ANTI-LOCK BRAKES.......... 8W-32-1
8W-40 INSTRUMENT CLUSTER....... 8W-40-1
8W-41 HORN/CIGAR LIGHTER........ 8W-41-18W-42 AIR CONDITIONING/HEATER.... 8W-42-1
8W-44 INTERIOR LIGHTING.......... 8W-44-1
8W-47 AUDIO SYSTEM.............. 8W-47-1
8W-48 HEATED REAR WINDOW....... 8W-48-1
8W-50 FRONT LIGHTING............ 8W-50-1
8W-51 REAR LIGHTING............. 8W-51-1
8W-52 TURN SIGNALS.............. 8W-52-1
8W-53 WIPERS.................... 8W-53-1
8W-70 SPLICE INFORMATION........ 8W-70-1
8W-80 CONNECTOR PIN OUTS....... 8W-80-1
8W-90 CONNECTOR LOCATIONS...... 8W-90-1
8W-95 SPLICE LOCATIONS........... 8W-95-1
HOW TO USE THIS GROUP
The purpose of this group is to show the electrical
circuits in a clear, simple fashion and to make trou-
bleshooting easier. Components that work together
are shown together. All electrical components used in
a specific system are shown on one diagram. The feed
for a system is shown at the top of the page. All
wires, connectors, splices, and components are shown
in the flow of current to the bottom of the page. Wir-
ing which is not part of the circuit represented is ref-
erenced to another page/section, where the complete
circuit is shown. In addition, all switches, compo-
nents, and modules are shown in theat rest posi-
tion with the doors closed and the key removed
from the ignition.
If a component is part of several different circuits,
it is shown in the diagram for each. For example, the
headlamp switch is the main part of the exterior
lighting, but it also affects the interior lighting and
the chime warning system.
It is important to realize that no attempt is
made on the diagrams to represent components
and wiring as they appear on the vehicle. For
example, a short piece of wire is treated the
same as a long one. In addition, switches and
other components are shown as simply as pos-
sible, with regard to function only.
The wiring diagram show circuits for all wheel-
bases. If there is a difference in systems or compo-
nents between wheel-bases, an identifier is placed
next to the component.
SECTION IDENTIFICATION
Sections in Group 8W are organized by sub-sys-
tems. The sections contain circuit operation descrip-
tions, helpful information, and system diagrams. The
intention is to organize information by system, con-
sistently from year to year.
CONNECTOR LOCATIONS
Section 8W-90 contains Connector Location illus-
trations. The illustrations contain the connector
number and component identification. Connector Lo-
cation charts in Section 8W-90 reference the illustra-
tion number for components and connectors.
Section 8W-80 shows each connector and the cir-
cuits involved with that connector. The connectors
are identified using the number on the Diagram
pages.
SPLICE LOCATIONS
Splice Location charts in Section 8W-70 show the
entire splice, and provide references to other sections
the splice serves.
Section 8W-95 contains illustrations that show the
general location of the splices in each harness. The
illustrations show the splice by number, and provide
a written location.
JWIRING DIAGRAMSÐÐYJ VEHICLES 8W - 1 - 1

FUEL/IGNITION
INDEX
page page
Automatic Shut Down (ASD) Relay............. 1
Battery Feed.............................. 2
Brake Switch Input......................... 5
Camshaft Position Sensor.................... 3
Crankshaft Position Sensor................... 3
Data Link Connector........................ 5
Diagram Index............................ 5
Engine Coolant Temperature Sensor............ 3
Fuel Injectors............................. 2
Fuel Pump Module......................... 2
Fuel Pump Relay.......................... 2
Heated Oxygen Sensor...................... 3Idle Air Control (IAC) Motor................... 2
Ignition Coil.............................. 2
Ignition Switch............................ 1
Intake Air Temperature Sensor................ 4
Malfunction Indicator Lamp (MIL)............... 5
Manifold Absolute Pressure Sensor............. 4
Park/Neutral Position Switch.................. 4
Power (Device) Ground...................... 5
Power Steering Pressure Switch............... 4
Tachometer Signal......................... 5
Throttle Position Sensor..................... 4
Vehicle Speed Sensor....................... 3
IGNITION SWITCH
Circuit A1 from fuse 4 in the Power Distribution
Center (PDC), supplies battery voltage to the ignition
switch. Depending upon position, the ignition switch
powers circuits A21, A22, A31, and A41.
START POSITION
In the START position, the ignition switch connects
circuit A1 to circuit A41. Circuit A41 connects to the
coil side of the starter motor relay.
Also in the START position, the case grounded ig-
nition switch provides ground for the brake lamp
switch and parking brake lamp switch on circuit G11.
START OR RUN POSITION
In the START and RUN position, the ignition
switch connects circuit A1 with circuit A21. The A21
circuit connects to fuses 5 and 9 in the fuse block.
Fuse 9 powers circuit G5. Fuse 5 powers circuit G50.
²Circuit G5 powers the buzzer module. Circuit G5
also splices to power the daytime running lamps
module (Canada only), A/C compressor clutch relay,
heated rear window relay, and the gauges and indi-
cator lamps in the instrument cluster.
RUN (ONLY) POSITION
When the ignition switch is in the RUN position, it
connects circuit A1 to circuit A22. Circuit A22 powers
fuses 1, 12, and 13 in the fuse block.
²Fuse 1 powers the rear wiper system on circuit
V23.
²Fuse 12 feeds the blower motor and air condition-
ing system on circuit C1.
²Fuse 13 feeds circuit F15 which powers the ABS
module and connects to the coil side of the ABS
power relay.
ACCESSORY OR RUN POSITION
In the ACCESSORY or RUN position, the ignition
switch connects circuit A1 to circuit A31. Circuit A31
connects to a bus bar in the fuse block that feeds
fuses 4 and 7 along with the circuit breaker in cavity
11 .
²Fuse 4 powers circuit L5 which feeds the turn sig-
nal flasher.
²Fuse 7 powers circuit F30. Circuit F30 supplies
power to the radio, radio relay, and the cigar lighter.
²The circuit breaker in cavity 11 powers the V6 cir-
cuits which feed the wiper switch and wiper motor.
AUTOMATIC SHUT DOWN (ASD) RELAY
When the ignition switch is in either the START or
RUN position, it connects circuit A1 from fuse 4 in
the Power Distribution Center (PDC) to circuit A21.
Circuit A21 powers fuse 5 in the fuse block. Circuit
G50 from fuse 5 splices to power the coil side of the
Automatic Shut Down (ASD) relay. The Powertrain
Control Module (PCM) provides ground for the relay
on circuit K51. Circuit K51 connects to cavity 51 of
the PCM.
When the PCM grounds the ASD relay, contacts in-
side the relay close and connect circuit A14 from fuse
1 in the PDC to circuit A142. Circuit A142 splices to
the generator field terminal, fuel injectors, ignition
coil, and heated oxygen sensor. Circuit A142 also con-
nects to cavity 57 of the PCM.
Circuit A14 from fuse 1 in the PDC supplies bat-
tery voltage to the contact side of the ASD relay.
HELPFUL INFORMATION
²Along with supplying voltage to the ASD relay
contacts, circuit A14 supplies voltage to the contact
side of the fuel pump relay.
²Circuit G50 also supplies battery voltage to the
coil side of the fuel pump relay.
²Circuit A14 also connects to cavity 3 of the PCM.
J8W-30 FUEL/IGNITIONÐYJ VEHICLES 8W - 30 - 1

INSTRUMENT CLUSTER
INSTRUMENT CLUSTER
The instrument cluster contains the gauges and
warning lamps. All gauges have magnetic move-
ments.
When the ignition switch is in either the START or
RUN position, circuit A1 from fuse 4 in the Power
Distribution Center (PDC) connects to circuit A21.
Circuit A21 powers fuse 9 in the fuse block. Fuse 9
powers circuit G5. One branch of circuit G5 connects
directly to the combination buzzer. The other branch
of circuit G5 splices to power the gauges, speedome-
ter, tachometer, voltmeter, indicator lamps, and
warning lamps in the instrument cluster.
When the parking lamps or headlamps are ON, the
headlamp switch connects circuit F33 to circuit L7.
Circuit L7 splices to the dimmer switch. Circuit E1
from the dimmer switch powers fuse 10 in the fuse
block when the parking lamps or headlamps are ON.
Circuit E2 from fuse 10 in the fuse block feeds the
illumination lamps in the instrument cluster.
Circuit Z1 provides ground the instrument cluster
illumination lamps, gauges and warning lamps.
HELPFUL INFORMATION
²Circuit G5 also powers the heated rear window,
A/C compressor clutch relay. On Canadian vehicles,
circuit G5 powers the Daytime Running Lamps
(DRL) module.
²Circuit F33 originates at fuse 8 in the fuse block.
Circuit A6 from fuse 3 in the PDC powers fuse 8 in
the fuse block.
ENGINE COOLANT TEMPERATURE GAUGE
Circuit G20 connects the engine coolant tempera-
ture gauge to the engine coolant temperature sensor.
The sensor is a variable resistor and case grounded
to the engine. Circuit G5 connects to the instrument
cluster and supplies voltage for the gauge.
The gauge uses two coils. The first coil has fixed
current flowing through it to maintain magnetic field
strength. Circuit Z1 provides ground for the fixed
current coil. The current level passing through the
second coil is controlled by the variable resistor in
the engine coolant temperature sender. The changing
current varies the magnetic field in the second coil.
Refer to group 8E, Instrument Panel and Gauges
for gauge operation.
FUEL GAUGE
Circuit G4 connects the fuel level sensor to the fuel
gauge in the instrument cluster. Circuit G5 supplies
voltage to the fuel gauge. The fuel level sensor draws
voltage from circuit G5 through the fuel gauge on cir-
cuit G4.The gauge uses two coils. The first coil has fixed
current flowing through it to maintain magnetic field
strength. Circuit Z1 provides ground for the fixed
current coil. The current level passing through the
second coil is controlled by the variable resistor in
the fuel level sensor. The changing current varies the
magnetic field in the second coil.
Circuit Z2 provides the ground path for the fuel
level sensor.
Refer to group 8E, Instrument Panel and Gauges
for gauge operation.
OIL PRESSURE GAUGE
The case grounded oil pressure sending unit is a
variable resistor. The sending unit connects to the oil
pressure gauge on circuit G60.
Circuit G5 connects to the instrument cluster and
supplies battery voltage to the oil pressure gauge.
The gauge uses two coils. The first coil has fixed cur-
rent flowing through it to maintain magnetic field
strength. Circuit Z1 provides ground for the fixed
current coil. The current level passing through the
second coil is controlled by the variable resistor in
the oil pressure sending unit. The changing current
varies the magnetic field in the second coil.
Refer to group 8E, Instrument Panel and Gauges
for gauge operation.
TACHOMETER
The Powertrain Control Module (PCM) provides
the tachometer signal to the electronic tachometer on
circuit G21. Circuit G21 originates at cavity 43 of the
PCM. Circuit Z1 provides ground for the tachometer's
internal logic circuits.
SPEEDOMETER
The electronic speedometer and odometer receive a
signal from the vehicle speed sensor on circuit G7.
Circuit G5 connects to the instrument cluster and
supplies battery voltage to the speedometer. Circuit
Z1 provides ground for the speedometer internal logic
circuits.
Circuit G7 splices to connect to the Powertrain
Control Module (PCM) and if equipped, the Daytime
Running Lamps (DRL) module.
FOUR-WHEEL DRIVE (4WD) INDICATOR LAMP
When the 4WD switch closes, circuit Z1 provides
ground for the 4WD indicator lamp in the instrument
panel. Circuit G5 connects to the instrument cluster
and supplies battery voltage to the 4WD indicator
lamp. Circuit G1 connects the indicator lamp to the
4WD switch.
J8W-40 INSTRUMENT CLUSTERÐYJ VEHICLES 8W - 40 - 1

HEATED REAR WINDOW
HEATED REAR WINDOW
The heated rear window relay supplies power to
heated rear window grid. When the operator presses
the heated rear window switch, the contacts inside
the switch momentarily close and circuit C16 con-
nects the relay timer to ground on circuit Z1. This
causes the relay to change state and complete a cir-
cuit to energize the coil side of the relay and start
the relay timer. Circuit G5 from fuse 9 in the fuse
block supplies voltage to the coil side of the relay.
Circuit Z1 provides ground for the relay.
When the heated rear window relay energizes, the
contacts inside the relay close and connect circuit
F32 to circuit C15. Fuse 3 in the fuse block protects
circuit F32.
Circuit C15 is double crimped at the heated rear
window relay. One branch of circuit C15 powers the
indicator lamp in the heated rear window switch.
The other branch of circuit C15 powers the heated
rear window grid. Circuit Z1 provides ground for the
heated rear window grid.
At the rear window grid, circuits C15 and Z1 pass
through lift gate support struts.
HELPFUL INFORMATION
²When the ignition switch is in the START or RUN
positions, it connects circuit A1 from fuse 4 in the
Power Distribution Center (PDC) to circuit A21. Cir-
cuit A21 supplies battery voltage to the fuse block
bus bar that powers circuit G5 through the fuse in
cavity 9.
²Circuit A6 from PDC fuse 3 supplies battery volt-
age to the fuse block bus bar that feeds fuse 3 and
circuit F32. Check fuse 3 in the PDC and fuse 3 in
the fuse block.
²Check for broken grid lines on the window.
²Check for a broken bus bar or disconnected leads
at the rear window.
²Check for a good ground.
DIAGRAM INDEX
Component Page
Fuse 3 (PDC)...........................8W-48-2
Fuse 4 (PDC)...........................8W-48-2
Fuse 6 (Fuse Block).......................8W-48-2
Fuse 9 (Fuse Block).......................8W-48-2
Heated Rear Window Relay..................8W-48-2
Heated Rear Window Grid...................8W-48-3
Heated Rear Window Switch.................8W-48-3
J8W-48 HEATED REAR WINDOWÐYJ VEHICLES 8W - 48 - 1