fuse JEEP CHEROKEE 1995 Service Repair Manual

fuse 4 in the fuse block. Fuse 4 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.
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 in the
HIGH position.
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 connect circuit
F141 from fuse 15 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.
The PCM supplies ground for the coil side of the
radiator fan relay on circuit C27. Circuit C27 con-
nects to cavity 31 of the PCM.
When the PCM grounds the coil side of the radia-
tor fan relay, the contacts close and connect 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 4 (Fuse Block).....................8W-42-3, 5
Fuse 6 (PDC).......................8W-42-3, 4, 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-RHDJ

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

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, fuse F87 from fuse 26 in the fuse block sup-
plies power to the chime/buzzer module. Circuit A21
from the ignition switch supplies power to fuse 26.
Circuit L7 from fuse 9 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 9.
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 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 for
the 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-44-6
Door Jamb Switches......................8W-44-7
Fuse 3 (PDC)...........................8W-44-6
Fuse 5 (PDC).........................8W-44-5, 8
Fuse 6 (PDC)...........................8W-44-6
Fuse 9 (Fuse Block).....................8W-44-3, 8
Fuse 16 (PDC)........................8W-44-4, 6
Fuse 25 (Fuse Block)......................8W-44-8
Fuse 26 (Fuse Block)......................8W-44-3
Glove Box Lamp and Switch.................8W-44-5
Headlamp Switch....................8W-44-3, thru 8
Headlamp Delay Module....................8W-44-3
Ignition Switch..........................8W-44-3
Instrument Cluster......................8W-44-3, 9
Instrument Panel Illumination Lamps..........8W-44-8, 9
Key-In Switch...........................8W-44-4
Liftgate Switch..........................8W-44-6
Reading Lamps..........................8W-44-6
Seat Belt Switch.........................8W-44-3
Telltale Connector (Instrument Cluster)...........8W-44-3
Time Delay Relay........................8W-44-4
Underhood Lamp.........................8W-44-4
8W - 44 - 2 8W-44 INTERIOR LIGHTINGÐXJ-RHDJ

RADIO
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.
Circuit A48 powers circuit F85 through fuse 13 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 fuse 16 in the Power Distribution
Center (PDC) supplies power for the radio memory.
Circuit A7 from fuse 3 in the PDC supplies voltage
to fuse 16. Circuits A7 and M1 are HOT at all times.
RADIO ILLUMINATION
Circuit E2 supplies battery voltage to the radio il-
lumination 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 ei-
ther 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
position. In the At Rest position, the relay connects
circuit F85 from fuse 13 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 re-
lay.
When voltage is present on circuit L90, the radio
illumination relay switches from its At Rest position
to connect circuit E2 to circuit X5.
HELPFUL INFORMATION
²Circuit A48 supplies voltage to fuse 13 in the fuse
block for circuit F85 when the ignition switch is in
the ACCESSORY or RUN positions. In these posi-
tions, the ignition switch connects circuit A1 from
fuse 6 in the PDC to circuit A48.²Circuit A3 from fuse 5 in the PDC supplies power
to the fuse block for fuse 9. Fuse 9 protects circuit
L7. When the headlamps or parking lamps are ON,
the headlamp switch connects circuit L7 to circuit
L90. When the adjustable dimmer switch is in the
LOW to ON positions, it internally connects circuit
L7 to circuit E2. Circuit E2 powers fuse 25 in the
fuse block. Circuit E2 continues through fuse 25.
POWER ANTENNA
The Power Antenna Relay supplies power to raise
and lower the antenna. Circuit F60 from fuse 7 in
the fuse block powers the relay. Circuit Z1 provides
ground for the relay.
When the radio is turned on, circuit X60 from the
radio energizes the relay to raise the antenna.
SPEAKERS
Circuit X53 feeds the left front speakers. Circuit
X55 is the return from the speakers to the radio.
Circuit X54 feeds the right front speakers. Circuit
X56 is the return from the speakers 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.
DIAGRAM INDEX
Component Page
Fuse 3 (PDC).........................8W-47-2, 4
Fuse 5 (PDC).......................8W-47-2, 4, 5
Fuse 6 (PDC).........................8W-47-2, 4
Fuse 7 (PDC).........................8W-47-2, 4
Fuse 9 (Fuse Block)...................8W-47-2, 4, 5
Fuse 13 (Fuse Block)....................8W-47-2, 4
Fuse 16 (PDC)........................8W-47-2, 4
Fuse 25 (Fuse Block)....................8W-47-2, 4
Headlamp Switch.......................8W-47-2, 4
Ignition Switch..........................8W-47-2
LCD Relay...........................8W-47-3, 5
Power Antenna..........................8W-47-6
Power Antenna Relay......................8W-47-6
Radio...........................8W-47-2 thru 8
Speakers............................8W-47-7, 8
J8W-47 AUDIO SYSTEMÐXJ-RHD 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 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

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
26 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 the head
lamp switch powers the illumination lamps in the
overhead console. Circuit E2 also powers fuse 25 in
the fuse block.
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. Fuse 16 in
the Power Distribution Center (PDC) supplies volt-
age to circuit M1 through circuit A7. Circuit A7 from
fuse 3 in the PDC supplies voltage to fuse 16 in the
PDC.
DIAGRAM INDEX
Component Page
Ambient Temperature Sensor.................8W-49-4
Chime/Buzzer Module......................8W-49-2
Fuse 3 (PDC)...........................8W-49-2
Fuse 5 (PDC)...........................8W-49-3
Fuse 6 (PDC)...........................8W-49-2
Fuse 9 (Fuse Block).......................8W-49-3
Fuse 16 (PDC)..........................8W-49-2
Fuse 26 (Fuse Block)......................8W-49-2
Headlamp Delay Module....................8W-49-2
Headlamp Switch.........................8W-49-3
Ignition Switch..........................8W-49-2
Instrument Cluster........................8W-49-4
Overhead Console....................8W-49-2, 3, 4
Telltale Connector (Instrument Cluster)...........8W-49-2
J8W-49 OVERHEAD CONSOLEÐXJ-RHD 8W - 49 - 1

FRONT LIGHTING
INDEX
page page
Diagram Index............................ 3
Dimming Module........................... 1
Fog Lamps............................... 2
Headlamp Delay Module..................... 1Headlamp Relay........................... 1
Headlamps............................... 1
Parking Lamps............................ 2
HEADLAMPS
The headlamp switch has three positions: ON,
PARK (parking lamps) and OFF. Circuit A3 from fuse
12 in the PDC connects to the headlamp switch and
feeds circuit L7 through fuse 9 in the fuse block. Cir-
cuit L7 connects to the headlamp switch.
Circuit A3 also splices to feed circuit L11 through
fuse 10 in the fuse block. Circuit L11 connects to the
dimmer switch circuitry in the multi-function switch.
The headlamp switch has an internal circuit
breaker that connects circuit A3 to circuit F34. Cir-
cuit F34 connects to the headlamp relay.
HEADLAMP RELAY
When the headlamp switch is in the ON position it
connects circuit A3 from fuse 5 in the Power Distri-
bution Center (PDC) to circuit F34. Circuit A3 is
HOT at all times.
Circuit F34 supplies battery voltage to the coil and
contact sides of the headlamp relay. Circuit Z1 sup-
plies ground for the relay. When voltage is present on
circuit F34, the relay contacts close and connect cir-
cuit F39 to circuit F34.
Circuit F39 powers the headlamps through 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 op-
erator 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 12 in the Power Distribution
Center (PDC) connects to circuit F34. Circuit F34
connects to circuit F39 through the headlamp relay.
Circuit F39 feeds circuit L4 through the headlamp
dimmer switch circuitry in the multi-function switch.
Circuit L4 powers the low beam of the headlamps.
When the operator selects high beam operation
with the turn signal stalk of the multi-functionswitch, 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 the
fog lamps, if equipped.
HELPFUL INFORMATION
²Check fuse 5 in the PDC.
²The headlamp switch has an internal circuit
breaker.
²Circuit L7 is double crimped at the headlamp
switch and branches to the chime module.
HEADLAMP DELAY MODULE
When the operator turns off the ignition switch and
the headlamp switch, the headlamp delay module
powers the headlamps for approximately 45 seconds.
When the ignition switch is in the RUN position,
circuit A21 powers circuit F87 through fuse 17 in the
fuse block. Circuit F87 supplies the IGNITION ON/
OFF signal to the headlamp delay module. Circuit Z1
provides ground for the module.
When the headlamp delay module activates, it con-
nects circuit X4 from fuse 5 in the fuse block to cir-
cuit F34. Circuit F34 connects to the circuit F39
through the headlamp relay. Circuit F39 powers the
headlamps through the headlamp dimmer switch cir-
cuit L4.
HELPFUL INFORMATION
Circuit A7 from fuse 3 in the PDC supplies voltage
to the fuse block bus bar that powers circuit X4
through the fuse in cavity 5.
DIMMING MODULE
Some vehicles are equipped with a dimming mod-
ule. The module is powered by the dimming relay.
In the RUN position, the ignition switch connects
circuit A1 from fuse 6 in the Power Distribution Cen-
ter (PDC) to circuit A38. Circuit A38 powers circuit
L170 through fuse 20 in the fuse block. Circuit L170
supplies power to the dimming relay.
When the headlamps are ON, circuit L90 from the
headlamp switch energizes the dimming relay. When
J8W-50 FRONT LIGHTINGÐXJ-RHD 8W - 50 - 1

energized, the relay supplies power to the dimming
module on a branch of circuit A38. Circuit Z1 pro-
vides ground for the dimming relay.
The dimming module connects to the headlamp
dimmer switch on circuits L3 and L4.
PARKING LAMPS
Circuit A3 from fuse 5 in the Power Distribution
Center (PDC) connects to a bus bar in the fuse block
which feeds circuit L7. Fuse 9 in the fuse block pro-
tects 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 side marker lamps. The Z1 circuit also provide
ground for the headlamps.
HELPFUL INFORMATION
²Check fuse 5 in PDC.
²Check fuse 9 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 25 in the
fuse block. Circuit E2 powers the illumination lamps.
FOG LAMPS
The fog lamps are controlled by the fog lamp
switch and fog lamp relay. The fog lamps operate
only when the headlamp switch is in the ON posi-
tion, and the operator has selected low-beam opera-
tion. When the headlamps are in high-beam
operation, the fog lamps will not operate.
Circuit F39 from fuse 13 in the Power Distribution
Center (PDC) supplies voltage to the contact side of
the park lamp relay.
When the fog lamp switch closes, it connects circuit
F34 from the headlamp relay to L35. Circuit L35
supplies power to the coil side of the fog lamp relay
and energizes the relay. Ground for the coil side of
the fog lamp relay is provided on circuit Z1.
When fog lamp relay energizes, it connects circuit
F39 to circuit 117. Circuit 117 supplies power to the
fog lamps. Circuit Z1 provides ground for the fog
lamps.
If the high beam lamps are ON, the dimmer switch
does not power circuit L4 and the fog lamp relay
opens. When the relay opens, battery voltage is re-
moved from the fog lamps.
8W - 50 - 2 8W-50 FRONT LIGHTINGÐXJ-RHDJ

DIAGRAM INDEX
Component Page
Chime/Buzzer Module......................8W-50-6
Dimming Module.........................8W-50-9
Dimming Relay..........................8W-50-8
Fog Lamp Relay........................8W-50-10
Fog Lamp Switch........................8W-50-10
Fuse 5 (Fuse Block).......................8W-50-7
Fuse 5 (PDC).........................8W-50-4, 8
Fuse 6 (PDC).........................8W-50-6, 8
Fuse 7 (PDC)..........................8W-50-10
Fuse 9 (Fuse Block).......................8W-50-4
Fuse 10 (Fuse Block)......................8W-50-7
Fuse 11 (Fuse Block)......................8W-50-8
Fuse 13 (PDC).........................8W-50-10
Fuse 20 (Fuse Block)......................8W-50-8
Fuse 26 (Fuse Block)......................8W-50-6
Headlamp Delay Module....................8W-50-7
Headlamp Dimmer Switch.................8W-50-4, 7
Headlamp Switch.....................8W-50-4, 7, 9
Headlamp Relay.........................8W-50-9
Ignition Switch........................8W-50-6, 8
Instrument Cluster........................8W-50-5
Left Fog Lamp.........................8W-50-10
Left Headlamp..........................8W-50-5
Left Marker Lamp........................8W-50-5
Left Tail, Stop and Turn Signal Lamp............8W-50-5
Overhead Console......................8W-50-4, 8
Right Fog Lamp........................8W-50-10
Right Headlamp.........................8W-50-5
Right Tail, Stop and Turn Signal Lamp...........8W-50-5
Telltale Connector (Instrument Cluster)...........8W-50-9
J8W-50 FRONT LIGHTINGÐXJ-RHD 8W - 50 - 3

REAR LIGHTING
TAIL LAMPS AND REAR LICENSE PLATE LAMPS
Circuit A3 from fuse 5 in the Power Distribution
Center (PDC) connects to a bus bar in the fuse block
which feeds circuit L7. Fuse 9 in the fuse block pro-
tects 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,
tail lamps, and rear license plate lamps.
HELPFUL INFORMATION
²Check fuse 5 in PDC.
²Check fuse 9 in the fuse block.
²When the headlamp switch is in the PARK or ON
position, circuit L7 also connects to circuit E2. Cir-
cuit E2 continues through fuse 25 in the fuse block.
Circuit E2 powers the illumination lamps.
STOP LAMPS AND CHMSL LAMPS
Circuit L9 from fuse 4 in the Power Distribution
Center (PDC) connects to the stop lamp switch.
When the operator depresses the brake pedal, the
stop lamp switch closes and connects circuit L9 to
circuit L50. Circuit L50 connects to the stop lamps
and center high mounted stop lamps (CHMSL). Cir-
cuit Z1 provides a ground for the stop lamps.
HELPFUL INFORMATION
²Check fuses 13 in the PDC.
²Check for continuity across the stop lamp switch
when it is closed.
BACK-UP LAMPS
In the START or RUN position, the ignition switch
connects circuit A1 from fuse 6 in the Power Distri-
bution Center (PDC) to circuit A21. Circuit A21 feeds
a bus bar in the PDC that powers circuit F12
through fuse 11.
Circuit F12 supplies power to the back-up lamp
switch. On automatic transmission equipped vehicles,
the back-up lamp switch is part of an assembly that
includes the PARK/NEUTRAL position switch. When
the operator puts the transmission in REVERSE, the
back-up lamp switch connects circuit F12 to circuit
L10. Circuit L10 feeds the back-up lamps. Circuit Z1
provides ground for the back-up lamps.
HELPFUL INFORMATION
²Check fuses 6 and 11 in the PDC.
²Check for continuity across the back-up lamp
switch when it is closed.
DIAGRAM INDEX
Component Page
Center High Mounted Stop Lamps (CHMSL).......8W-51-3
Fuse 4 (PDC)...........................8W-51-3
Fuse 5 (PDC)...........................8W-51-2
Fuse 6 (Fuse Block).......................8W-51-2
Fuse 6 (PDC)...........................8W-51-2
Fuse 9 (Fuse Block).......................8W-51-2
Headlamp Switch.........................8W-51-2
Ignition Switch..........................8W-51-2
Left Back-Up Lamp.......................8W-51-4
Left Side Marker Lamp.....................8W-51-4
Left Tail/Stop Lamp.......................8W-51-4
Left Turn Signal Lamp.....................8W-51-4
License Plate Lamp.......................8W-51-3
Park/Neutral Position Switch.................8W-51-2
Right Back-Up Lamp......................8W-51-5
Right Side Marker Lamp....................8W-51-5
Right Tail/Stop Lamp......................8W-51-4
Right Turn Signal Lamp....................8W-51-5
Stop Lamp Switch........................8W-51-3
J8W-51 REAR LIGHTINGÐXJ-RHD 8W - 51 - 1