fuse JEEP CHEROKEE 1995 Service Manual PDF

CHARGING SYSTEM INDICATOR LAMP
The Powertrain Control Module (PCM) illuminates
the charging system indicator lamp by providing
ground for the lamp on circuit G12. Circuit G12 con-
nects to cavity 36 of the PCM. Circuit F87 supplies
battery voltage to the lamp.
FOUR-WHEEL DRIVE (4WD) SWITCH
When the 4WD switch closes, circuit Z1 provides
ground for the 4WD indicator lamp in the instrument
cluster. Circuit F87 connects to the instrument clus-
ter and supplies battery voltage to the 4WD indicator
lamp. Circuit 107 connects the indicator lamp to the
4WD switch. Circuit 106 connects the lamp to the in-
strument cluster and circuit F87.
CLUSTER GROUND
Circuit Z1 from the instrument cluster left connec-
tor provides ground for the illumination lamps and
indicator lamps.
HELPFUL INFORMATION
²If the warning lamps don't operate, check fuse 14
in the fuse block.
²If the indicator lamps and illumination lamps
don't operate, check fuse 13 in the fuse block.
²Inspect the ground at the instrument panel lower
right reinforcement support.
DIAGRAM INDEX
Component Page
4WD Switch............................8W-40-9
4WD Indicator Lamp......................8W-40-9
ABS Control Module......................8W-40-9
Brake Warning Switch.....................8W-40-10
Chime/Buzzer Module......................8W-40-8
Daytime Running Lamps Module.............8W-40-5, 6
Engine Coolant Temperature Sending Unit.........8W-40-6
Engine Oil Pressure Sending Unit..............8W-40-6
Fuse 3 (PDC)...........................8W-40-8
Fuse 5 (PDC)...........................8W-40-4
Fuse 6 (PDC).........................8W-40-4, 8
Fuse 11 (PDC)..........................8W-40-8
Fuse 16 (PDC)..........................8W-40-8
Fuse 9 (Fuse Block).......................8W-40-8
Fuse 15 (Fuse Block)......................8W-40-4
Fuse 17 (Fuse Block)....................8W-40-4, 8
Fuse 19 (Fuse Block)......................8W-40-4
Headlamp Switch.......................8W-40-4, 5
Headlamp Delay Module....................8W-40-8
Headlamp Dimmer Switch...................8W-40-5
Ignition Switch......................8W-40-4, 8, 10
Instrument Cluster......................8W-40-4, 5
Low Washer Fluid Lamp Switch...............8W-40-8
Park Brake Switch.......................8W-40-10
Powertrain Control Module..................8W-40-6
Remote Keyless Entry Module................8W-40-8
Telltale Connector (Instrument Cluster).....8W-40-7 thru 10
J8W-40 INSTRUMENT CLUSTERÐXJ VEHICLES 8W - 40 - 3

HORN/CIGAR LIGHTER
HORN
The horn system uses two switches and horn relay.
The horn switches are on the steering wheel.
Circuit A7 from fuse 3 in the Power Distribution
Center (PDC) feeds a fuse block bus bar that powers
circuit X4 through fuse 11. Circuit X4 is HOT at all
times and powers the coil and contact sides of the
horn relay.
When the case grounded horn switch is depressed,
circuit X3 provides ground for the coil side of the re-
lay and the contacts close. When the contacts close,
circuit X2 supplies voltage to the case grounded
horns.
HELPFUL INFORMATION
²The horn switches are grounded to the steering
wheel.
²Circuit X4 is double crimped at the coil side of the
horn relay.
²Check fuse 3 in the PDC and fuse 11 in the fuse
block.
CIGAR LIGHTER
In the ACCESSORY or RUN position, the ignition
switch supplies voltage to fuse 2 in the fuse block on
circuit A48. Fuse 2 feeds circuit F85 which connects
to the cigar lighter. When the lighter is depressed,
the contacts inside of the lighter element close and
voltage flows to ground on circuit Z1.
HELPFUL INFORMATION
²In the ACCESSORY or RUN position, the ignition
switch connects circuit A1 from fuse 6 in the PDC
with circuit A48.
²Circuit F85 also powers the radio and LCD relay.
DIAGRAM INDEX
Component Page
Cigar Lighter...........................8W-41-3
Fuse 3 (PDC)...........................8W-41-2
Fuse 6 (PDC)...........................8W-41-3
Fuse 11 (Fuse Block)......................8W-41-2
Fuse 2 (Fuse Block).......................8W-41-3
Horns................................8W-41-2
Horn Relay.............................8W-41-2
Horn Switch............................8W-41-2
Ignition Switch..........................8W-41-3
J8W-41 HORN/CIGAR LIGHTERÐXJ VEHICLES 8W - 41 - 1

AIR CONDITIONING/HEATER
CONTENTS
page page
A/C-HEATER SYSTEM...................... 1 HEATERSYSTEM......................... 1
GENERAL INFORMATION
This section of the wiring diagrams is divided into
two sub-sections; Heater, and A/C and Heater. When
referring to the circuit descriptions or wiring dia-
grams, ensure that you use the correct sub-section.
HEATER SYSTEM
BLOWER MOTOR
In the RUN or ACCESSORY position, the ignition
switch connects circuit A1 from fuse 6 in the Power
Distribution Center (PDC) to circuit A48. Circuit A48
supplies battery voltage to fuse 5 in the fuse block.
Fuse 5 supplies power to the heat mode switch on
circuit C7.
Circuit C43 from the heat mode switch splices to
supply voltage to the blower motor switch and the
blower motor resistor block. The blower motor switch
sets blower motor speed to HIGH, M1, M2, or LOW.
When the blower motor switch is in the LOW posi-
tion, circuit C43 from the heat mode supplies voltage
to the resistor block. Voltage does not pass through
the blower motor switch in the LOW position.In the M1 position, the blower motor switch sup-
plies voltage to the resistor block on circuit C4. From
circuit C4, voltage passes through three resistors in
the resistor block to the blower motor on circuit C1.
In the M2 position, the blower motor supplies volt-
age to the resistor block on circuit C6. From circuit
C6 voltage flows through two resistors to the blower
motor on circuit C1.
In the HIGH position, the blower motor switch con-
nects directly to the blower motor on circuit C1. Volt-
age does not pass through the resistor block.
Circuit Z1 provides ground for the blower motor.
A/C-HEATER SYSTEM
GENERAL INFORMATION
Several fuses supply power for the air conditioning/
heater system. In the START or RUN positions, the
ignition switch connects circuit A1 from fuse 6 in the
Power Distribution Center (PDC) to circuit A21. Cir-
cuit A21 powers a bus bar in the PDC that feeds cir-
cuit F12 through fuse 11. Circuit F12 feeds the
contact side of the A/C compressor clutch relay and
the coil side of the radiator fan relay (4.0L engine).
In the RUN or ACCESSORY position, the ignition
switch connects circuit A1 from fuse 11 in the PDC to
circuit A48. Circuit A48 supplies battery voltage to
fuse 5 in the fuse block. Fuse 5 supplies power to the
A/C-Heater control switch on circuit C7.
Fuse 13 in the PDC supplies battery voltage to the
contact side of the radiator fan relay on circuit F141.
Circuit A14 from fuse 15 in the PDC powers PDC
fuse 4.
BLOWER MOTOR
In the RUN or ACCESSORY position, the ignition
switch connects circuit A1 from fuse 6 in the PDC to
circuit A48. Circuit A48 supplies battery voltage to
fuse 5 in the fuse block. Fuse 5 supplies power to the
A/C-Heater control switch on circuit C7.
Circuit C43 from the A/C-heater switch splices to
supply voltage to the blower motor switch and the
blower motor resistor block. The blower motor switch
sets blower motor speed to HIGH, M1, M2, or LOW.
When the blower motor switch is in the LOW posi-
tion, circuit C43 from the A/C-Heater switch supplies
voltage to the resistor block. Voltage does not pass
through the blower motor switch in the LOW position
In the M1 position, the blower motor switch sup-
plies voltage to the resistor block on circuit C4. From
circuit C4, voltage passes through three resistors in
the resistor block to the blower motor on circuit C1.
J8W-42 AIR CONDITIONING/HEATERÐXJ VEHICLES 8W - 42 - 1

In the M2 position, the blower motor supplies volt-
age to the resistor block on circuit C6. From circuit
C6 voltage flows through two resistors to the blower
motor on circuit C1.
In the HIGH position, the blower motor switch con-
nects directly to the blower motor on circuit C1. Volt-
age does not pass through the resistor block.
Circuit Z1 provides ground for the blower motor.
AIR CONDITIONING OPERATION
When the A/C-heater control switch is moved to an
A/C position or the defrost position, the Powertrain
Control Module (PCM) receives the A/C select signal
on circuit C90. Circuit C90 connects to cavity 28 of
the PCM.
Circuit also C90 splices to the low pressure switch
and to supply battery voltage to the coil side of the
A/C compressor clutch relay. If the low pressure
switch is closed, circuit C90 connects to circuit C21.
Circuit C21 supplies battery voltage to the A/C cy-
cling switch. Circuit C91 from the A/C cycling switch
provides the A/C request signal to the PCM. Circuit
C91 connects to cavity 27 of the PCM. Circuit Z1 pro-
vides ground for the A/C cycling switch.
After receiving the A/C request signal, the PCM
supplies ground for the A/C compressor clutch relay
on circuit C13. Circuit F12 from fuse 11 in the PDC
supplies battery voltage to the contact side of the A/C
compressor clutch relay. When the PCM grounds the
relay, the contacts close and connect circuit F12 to
circuit C3. Circuit C3 feeds the A/C compressor
clutch.
Also, after receiving the A/C request signal, the
PCM supplies ground for the coil side of the radiator
fan relay on circuit C27 (4.0L engine). Circuit C27
connects to cavity 31 of the PCM. Circuit F12 sup-
plies battery voltage to the coil side of the relay.
When the PCM grounds the coil side of the radia-
tor fan relay, the contacts close and connects circuit
F141 from fuse 4 in the PDC to circuit C25. Circuit
C25 feeds the radiator fan motor. Circuit Z1 provides
ground for the motor.
HELPFUL INFORMATION
Circuit A14 from PDC fuse 2 powers circuit F141
through fuse 15 in the PDC.
RADIATOR FAN RELAY AND MOTOR
In the START or RUN positions, the ignition
switch connects circuit A1 from fuse 6 in the Power
Distribution Center (PDC) to circuit A21. Circuit A21
powers a bus bar in the PDC that feeds circuit F12
through fuse 11. Circuit F12 feeds the coil side of the
radiator fan relay (4.0L engine).
The PCM supplies ground for the coil side of the
radiator fan relay on circuit C27 (4.0L engine). Cir-
cuit C27 connects to cavity 31 of the PCM.
When the PCM grounds the coil side of the radia-
tor fan relay, the contacts close and connects circuit
F141 from fuse 15 in the PDC to circuit C25. Circuit
C25 feeds the radiator fan motor. Circuit Z1 provides
ground for the radiator fan motor.
HELPFUL INFORMATION
Circuit A14 from PDC fuse 2 powers circuit F141
through fuse 15 in the PDC.
DIAGRAM INDEX
Component Page
A/C Compressor Clutch.....................8W-42-4
A/C Compressor Clutch Relay................8W-42-4
A/C Cycling Switch.......................8W-42-4
A/C Low Pressure Switch...................8W-42-4
A/C Mode Select Switch....................8W-42-5
Blower Motor...........................8W-42-3
Blower Motor Switch......................8W-42-3
Blower Motor Resistor.....................8W-42-3
Fuse 2 (PDC)...........................8W-42-5
Fuse 5 (Fuse Block).....................8W-42-3, 5
Fuse 6 (PDC).........................8W-42-3, 5
Fuse 11 (PDC)..........................8W-42-4
Fuse 15 (PDC)..........................8W-42-5
Heater Mode Switch.......................8W-42-3
Ignition Switch......................8W-42-3, 4, 5
Powertrain Control Module..................8W-42-4
Radiator Fan Motor.......................8W-42-5
Radiator Fan Relay.......................8W-42-5
8W - 42 - 2 8W-42 AIR CONDITIONING/HEATERÐXJ VEHICLESJ

INTERIOR LIGHTING
INDEX
page page
Cargo Lamp, Courtesy Lamps and Dome Lamp.... 1
Chime/Buzzer Module....................... 2
Diagram Index............................ 2
General Information........................ 1
Glove Box Lamp........................... 1
Ignition Switch Lamp........................ 1Instrument Panel Illumination Lamps............ 1
Reading Lamps........................... 2
Time Delay Relay.......................... 1
Underhood Lamp.......................... 2
Visor Vanity Mirror Lamps.................... 2
GENERAL INFORMATION
Circuit M1 supplies power to the glove box lamp,
left courtesy lamp, right courtesy lamp, dome lamp,
and cargo lamp. The M1 circuit also connects to the
remote keyless entry module. Circuit M1 is protected
by the ignition off draw (IOD) fuse (fuse 9) in the fuse
block.
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 lamp
²Rear wiper switch lamp
²Fog lamp switch lamp
Fuse 19 in the fuse block protects circuit E2. Circuit
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
The time delay relay is used to allow a time-ON
function for the ignition switch lamp and the courtesy
lamp. Power for the relay is received on the M1
circuit from the IOD fuse (fuse F9) in the fuse block.
Circuit M2 provides ground for the time delay relay
through the right and left door ajar switches and the
headlamp switch. When a door is opened, or the
headlamp switch is moved to the dome lamp position,a ground path is provided for the relay on circuit M2.
This energizes the relay, causing the contacts to close.
When the relay contacts close, power is provided
through the relay to circuit M50. The M50 circuit
supplies current to the ignition switch lamp. Circuit
Z1 provides ground for the lamp.
GLOVE BOX LAMP
Circuit M1 from the IOD fuse (fuse F9) in the fuse
block powers the glove box lamp. A case grounded
switch, in series after the lamp, closes when the glove
box door is opened. The switch completes a path to
ground on circuit Z1.
CARGO LAMP, COURTESY LAMPS AND DOME
LAMP
Circuit M1 from the IOD fuse (fuse F9) in the fuse
block supplies power to the cargo, courtesy lamps and
dome lamp. This 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 from the cour-
tesy and dome lamps. 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 M2 connects to circuit M4 at the cargo lamp.
Circuit M4 connects to the liftgate switch. The lift-
gate switch connects to ground circuit Z1. When the
lift gate opens, the plunger in the switch closes, com-
pleting 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.
J8W-44 INTERIOR LIGHTINGÐXJ VEHICLES 8W - 44 - 1

READING LAMPS
Circuit M1 from the IOD fuse (fuse F9) in the fuse
block 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 the IOD fuse (fuse F9) in the fuse
block 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 van-
ity mirror is case grounded.
UNDERHOOD LAMP
Circuit A6 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.
CHIME/BUZZER MODULE
The buzzer or optional chime module sounds an au-
dible warning tone. The tone sounds for seat belt
warning and when the ignition key is in the ignition
switch while the drivers door is open. The tone also
sounds when the ignition key is in the ON position
while the drivers side seat belt is not buckled. Lastly,
the tone sounds when the headlamps are ON when
the ignition is OFF. Refer to Group 8U for system op-
eration.
When the ignition switch is in the RUN or START
position, circuit F87 from fuse 17 in the fuse block
supplies power to the chime/buzzer module. Circuit
A21 from the ignition switch supplies power to fuse
17.
Circuit L7 from fuse 15 in the fuse block also sup-
plies power to the chime/buzzer module. Circuit A3
from fuse 5 in the Power Distribution Center (PDC)
powers fuse 15.
When the parking lamps or headlamps are ON, the
headlamp switch connects circuit G26 with the driv-
ers side door jamb switch. Circuit G26 also connects
to the key-in switch. Circuit M11 connects the key-in
switch to the chime/buzzer module and the headlamp
switch.
If the headlamps are ON, and the drivers door
opens, ground for the chime/buzzer is on circuit C26
from the headlamp switch through the door jamb
switch to circuit Z1.
If the headlamps are OFF with the key in the ig-
nition while the drivers side door is open, ground forthe chime/buzzer is supplied through the key-in
switch. The ground path is over circuit M11, through
the closed key-in switch to circuit C26. From circuit
C26, the ground path continues through the drivers
door jamb switch to circuit Z1.
Circuit G11 from the buzzer powers the seat belt
warning lamp in the instrument cluster. Circuit Z1
at the instrument cluster provides ground for the
lamp.
Circuit G10 from the buzzer connects to the seat
belt switch. When the seat belt switch closes a path
to ground is completed on circuit Z1 and the tone
sounds momentarily.
Circuit Z1 also grounds the chime\buzzer module.
HELPFUL INFORMATION
Circuit F87 also powers the instrument cluster and
the headlamp delay module.
DIAGRAM INDEX
Component Page
Cargo Lamp............................8W-44-6
Chime/Buzzer Module......................8W-44-3
Courtesy Lamps.........................8W-44-5
Dome Lamp............................8W-44-7
Door Jamb Switches.....................8W-44-10
Fuse 3 (PDC).........................8W-44-4, 6
Fuse 5 (PDC).........................8W-44-3, 8
Fuse 6 (PDC)...........................8W-44-3
Fuse 9 (Fuse Block).....................8W-44-4, 6
Fuse 15 (Fuse Block)....................8W-44-3, 8
Fuse 16 (PDC)........................8W-44-4, 6
Fuse 17 (Fuse Block)......................8W-44-3
Fuse 19 (Fuse Block)......................8W-44-8
Glove Box Lamp and Switch.................8W-44-5
Headlamp Switch...................8W-44-3, 4, 5, 8
Headlamp Delay Module....................8W-44-4
Headlamp Delay Relay.....................8W-44-3
Ignition Switch..........................8W-44-3
Instrument Cluster........................8W-44-3
Instrument Panel Illumination Lamps..........8W-44-8, 9
Intermittent Wiper Control Module.............8W-44-4
Key-In Switch...........................8W-44-4
Liftgate Switch..........................8W-44-6
Reading Lamps..........................8W-44-7
Remote Keyless Entry Module................8W-44-7
Seat Belt Switch.........................8W-44-3
Telltale Connector (Instrument Cluster)...........8W-44-3
Time Delay Relay........................8W-44-4
Underhood Lamp.........................8W-44-4
Vanity Lamps...........................8W-44-7
8W - 44 - 2 8W-44 INTERIOR LIGHTINGÐXJ VEHICLESJ

AUDIO SYSTEM
RADIO
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. Cir-
cuit A48 powers circuit F85 through fuse 2 in the fuse
block. Circuit F85 powers the radio.
Circuit Z1 provides ground for the radio. The an-
tenna connects to the rear of the radio.
RADIO MEMORY
Circuit M1 from the Ignition Off Draw (IOD) fuse
(fuse 9) in the fuse block supplies power for the radio
memory. The IOD fuse is removed during vehicle
shipping to prevent excessive battery draw.
Circuit A6 from fuse 16 in the Power Distribution
Center (PDC) supplies voltage to fuse 9. Circuit A7
from fuse 3 in the PDC powers circuit A6 through
fuse 16. Circuits A6, A7 and M1 are HOT at all times.
RADIO ILLUMINATION
Circuit E2 supplies battery voltage to the radio
illumination lamps when the headlamps or parking
lamps are on and the dimmer switch is in the LOW or
ON positions.
Circuit X5 supplies battery voltage for the radio
clock and station frequency display. Circuit X5 origi-
nates at the radio illumination relay and is fed by
either circuit F85 or circuit E2 depending on the
switch position inside the relay.
When the headlamps and parking lamps are off, the
radio illumination relay is in its normal At Rest posi-
tion. In the At Rest position, the relay connects circuit
F85 from fuse 2 in the fuse block to circuit X5.
When the headlamps or parking lamps are on, cir-
cuit L90 from the headlamp switch supplies battery
voltage to the coil side of the radio illumination relay.
Circuit Z1 provides ground for the coil side of the
relay.
When voltage is present on circuit L90, the radio
illumination relay switches from its At Rest position
to connect circuit E2 to circuit X5.
SPEAKERS
There are 3 different radio packages. The standard
radio package includes 2 speakers; one in each front
door. The four speaker system uses speakers in each
front door plus speakers in the rear sound bar. The six
speaker system has the front door speakers, sound bar
speakers and two speakers in the instrument panel.
BASE RADIO
Vehicles with the base radio have a jumper between
the radio and the instrument panel connectors. The
jumper simulates rear speaker load.Circuit X53 feeds the speaker in the left front door.
Circuit X55 is the return from the speaker to the
radio.
Circuit X54 feeds the right front door speaker. Cir-
cuit X56 is the return from the speaker to the radio.
FOUR SPEAKER SYSTEM
Circuit X53 feeds the speaker in the left front door.
Circuit X55 is the return from the speaker to the
radio.
Circuit X54 feeds the right front door speaker. Cir-
cuit X56 is the return from the speaker to the radio.
Circuit X51 feeds the left rear speaker. Circuit X57
is the return from the speaker to the radio.
Circuit X52 feeds the right rear speaker. Circuit
X58 is the return from the speaker to the radio.
SIX SPEAKER SYSTEM
Circuit X53 feeds the left speaker in the instrument
panel. The X53 circuit is double crimped at the in-
strument panel left speaker and branches to the left
front door speaker. Circuit X55 is the return to the
radio from the instrument panel left speaker and left
front door speaker. Circuit X55 is double crimped at
the instrument panel left speaker.
Circuit X54 feeds the right speaker in the instru-
ment panel. The X54 circuit is double crimped at the
instrument panel right speaker and branches to the
right front door speaker. Circuit X56 is the return to
the radio from the instrument panel left speaker and
left front door speaker. Circuit X56 is double crimped
at the instrument panel left speaker.
Circuit X51 feeds the left rear speaker. Circuit X57
is the return from the speaker to the radio.
Circuit X52 feeds the right rear speaker. Circuit
X58 is the return from the speaker to the radio.
DIAGRAM INDEX
Component Page
Fuse Block...........................8W-47-2, 3
Headlamp Switch.........................8W-47-2
Ignition Switch..........................8W-47-2
LCD Relay.............................8W-47-3
Power Distribution Center..................8W-47-2, 3
Radio............................8W-47-2 thru 7
Speakers (Six Speaker System)..............8W-47-4, 5
Speakers (Four Speaker System).............8W-47-6, 7
J8W-47 AUDIO SYSTEMÐXJ VEHICLES 8W -47 - 1

HEATED REAR WINDOW
HEATED REAR WINDOW
The heated rear window relay supplies power to
heated rear window grid. Circuit F83 from fuse 8 in
the fuse 8 in the fuse block supplies power to the
heated rear window relay when the ignition switch is
in the ACCESSORY 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 F81 from fuse 18 in the fuse block supplies
voltage to the coil and contact sides of the relay. Cir-
cuit Z1 provides ground for the relay.
When the heated rear window relay energizes, the
contacts inside the relay close and connect circuit
F81 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 6 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 6 (PDC)...........................8W-48-2
Fuse 7 (PDC)...........................8W-48-2
Fuse 8 (Fuse Block).......................8W-48-2
Fuse 18 (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 VEHICLES 8W - 48 - 1

OVERHEAD CONSOLE
OVERHEAD CONSOLE
When the ignition switch is in the START or RUN
position, it connects circuit A1 from fuse 6 in the
Power Distribution Center (PDC) to circuit A21. Cir-
cuit A21 supplies power to circuit F87 through fuse
17 in the fuse block. Circuit F87 supplies power to
the overhead console.
When the headlamps or parking lamps are ON, cir-
cuits L90 and E2 provide voltage to the overhead
console for illumination. Voltage on circuit L90 in-
forms the overhead console that the headlamps or
parking lamps are ON. Circuit E2 from fuse 19 in
the fuse block powers the illumination lamps in the
overhead console. Circuit E2 originates at the head-
lamp switch.
Circuits Z1 and Z2 provides ground for the over-
head console. From circuit M2, the overhead console
senses when one of the door jamb switches opens.
AMBIENT TEMPERATURE SENSOR
The ambient temperature sensor is a variable re-
sistor. Circuit G31 supplies voltage from the over-
head console to the sensor. Circuit G32 is the signal
return from the sensor to the overhead console.
LAMPS
Circuit M1 supplies voltage for the case grounded
reading lamps in the overhead console. The ignition
off draw (IOD) fuse (fuse 9) in the fuse block supplies
voltage to circuit M1. Circuit A6 from fuse 16 in PDC
feeds the IOD fuse. Circuit A7 from fuse 3 in the
PDC supplies voltage to fuse 1 in the PDC.
DIAGRAM INDEX
Component Page
Ambient Temperature Sensor.................8W-49-4
Chime/Buzzer Module......................8W-49-2
Fuse 1 (PDC)...........................8W-49-2
Fuse 3 (PDC)...........................8W-49-2
Fuse 5 (PDC)...........................8W-49-2
Fuse 9 (Fuse Block).......................8W-49-2
Fuse 15 (Fuse Block)......................8W-49-3
Fuse 16 (PDC)..........................8W-49-2
Fuse 17 (Fuse Block)......................8W-49-2
Fuse 19 (Fuse Block)......................8W-49-3
Headlamp Delay Module....................8W-49-2
Headlamp Switch.........................8W-49-3
Ignition Switch..........................8W-49-2
Instrument Cluster........................8W-49-4
Overhead Console......................8W-49-3, 4
Overhead Console........................8W-49-2
Telltale Connector (Instrument Cluster)...........8W-49-2
J8W-49 OVERHEAD CONSOLEÐXJ VEHICLES 8W - 49 - 1

FRONT LIGHTING
INDEX
page page
Daytime Running Lamp (DRL) Module........... 2
Diagram Index............................ 2
Fog Lamps............................... 1Headlamp Delay Module..................... 2
Headlamps............................... 1
Parking Lamps............................ 1
HEADLAMPS
The headlamp switch has three positions: ON,
PARK (parking lamps) and OFF. Circuit A3 from fuse
5 in the PDC connects to the headlamp switch and
feeds the circuit L7 through fuse 15 in the fuse block.
Circuit L7 connects to the headlamp switch.
Circuit A3 also splices to feed circuit L11 through
fuse 4 in the fuse block. Circuit L11 connects to the
dimmer switch circuitry in the multi-function switch.
Circuit A3 from fuse 5 in the PDC supplies battery
voltage to the headlamp switch. The headlamp switch
has an internal circuit breaker that connects circuit
A3 to circuit F34. Circuit F34 connects to the dimmer
switch circuitry in the multi-function switch.
HEADLAMP SWITCH IN OFF OR PARKING
LAMP POSITION
Circuit L11 connects to the dimmer switch portion
of the multi-function switch. Circuit L11 supplies
power for the high beams on circuit L3 when the
operator flashes the headlamps with the turn signal
stalk of the multi-function switch.
HEADLAMP SWITCH IN ON POSITION
When the headlamp switch is in the ON position,
circuit A3 from fuse 5 in the Power Distribution Cen-
ter (PDC) connects to circuit F34. Circuit F34 con-
nects to the dimmer switch portion of the multi-
function switch and feeds circuit L4. Circuit L4
powers the low beam of the headlamps.
When the operator selects high beam operation
with the turn signal stalk of the multi-function
switch, circuit L11 connects to the L3 circuit. Circuit
L3 powers high beam operation.
HEADLAMP GROUND
Circuit Z1 provides ground for both the right and
left headlamps. Circuit Z1 also supplies ground for
the fog lamps, if equipped.
HELPFUL INFORMATION
²Check fuse 5 in the PDC.
²The headlamp switch has an internal circuit
breaker.
PARKING LAMPS
Circuit A3 from fuse 5 in the Power DistributionCenter (PDC) connects to a bus bar in the fuse block
which feeds circuit L7. Fuse 15 in the fuse block
protects circuit L7.
The headlamp switch has three positions: ON,
PARK (parking lamps) and OFF, plus a dimmer
switch. When the headlamp switch is in the PARK or
ON position, the switch connects circuit L7 to circuit
L90. From the headlamp switch, circuit L90 branches
to power the front parking lamps and rear tail lamps,
side marker lamps, and rear license plate lamps.
GROUND CIRCUIT
Circuit Z1 provides a ground for the parking lamps
and turn signal lamps. The Z1 circuit also provide
ground for the headlamps.
HELPFUL INFORMATION
²Check fuse 5 in the PDC.
²Check fuse 15 in the fuse block.
²When the headlamp switch is in the PARK or ON
position, the dimmer circuit, L7, also connects to cir-
cuit E2. Circuit E2 continues through fuse 19 in the
fuse block. Circuit E2 powers the illumination lamps.
FOG LAMPS
The fog lamps are controlled by the fog lamp
switch, park lamp relay and high beam relay. The fog
lamps operate only when the headlamp switch is in
the ON position, and the operator has selected low-
beam operation. When the headlamps are in high-
beam operation, the fog lamps will not operate.
Circuit F39 from fuse 5 in the Power Distribution
Center (PDC) supplies voltage to the contact side of
the park lamp relay.
Circuit L90 supplies power to the coil side of the
park lamp relay. Circuit L35 connects to the coil side
of the relay and to circuit Z1 through the fog lamp
switch. Ground for the coil side of the relay is pro-
vided on circuit Z1 through the fog lamp switch.
When the fog lamp switch closes, the park lamp
relay contacts close and circuit F39 passes through
the relay to power the contact side of the high beam
relay. When the headlamp high beams are OFF, the
high beam relay is not energized and voltage flows
through the normally closed contacts to circuit L39.
J8W-50 FRONT LIGHTINGÐXJ VEHICLES 8W - 50 - 1