1995 JEEP YJ brake

DIAGRAM INDEX
Component Page
4WD Switch.........................8W-40-9, 13
4WD Indicator Lamp....................8W-40-9, 13
ABS Control Module...................8W-40-10, 13
Brake Warning Switch...................8W-40-9, 14
Chime/Buzzer Module...................8W-40-8, 12
Dimming Module........................8W-40-11
Diode...............................8W-40-13
Engine Coolant Temperature Sending Unit.........8W-40-6
Engine Oil Pressure Sending Unit..............8W-40-6
Fuse 5 (PDC)........................8W-40-4, 11
Fuse 6 (PDC)......................8W-40-4, 8, 12
Fuse 11 (PDC).......................8W-40-8, 12
Fuse 9 (Fuse Block)....................8W-40-4, 11
Fuse 25 (Fuse Block)...................8W-40-4, 11Component Page
Fuse 26 (Fuse Block).................8W-40-4, 8, 12
Fog Lamp Switch Lamp...................8W-40-11
Headlamp Switch......................8W-40-4, 11
Headlamp Delay Module.................8W-40-8, 12
Headlamp Dimmer Switch...................8W-40-5
Ignition Switch.................8W-40-4, 6, 8, 12, 14
Instrument Cluster................8W-40-4 thru 7, 14
Low Washer Fluid Lamp Switch............8W-40-8, 12
Overhead Console.....................8W-40-8, 12
Park Brake Switch.....................8W-40-9, 14
Powertrain Control Module..............8W-40-6, 9, 14
Telltale Connector (Instrument Cluster).....8W-40-8 thru 14
J8W-40 INSTRUMENT CLUSTERÐXJ-RHD 8W - 40 - 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

TRAILER TOW
TRAILER TOW
The factory installed trailer tow system in this ve-
hicle uses three relays and a circuit breaker along
with the trailer tow wiring connector located below
the rear bumper.
Battery voltage for the trailer tow circuit breaker
and relays is supplied on circuit A11. This circuit is
HOT at all times and connects to the power accessory
tap in the fuse block. An in line 10 amp circuit pro-
tected breaker protects circuit A11 and the trailer
tow circuits. The trailer tow circuit breaker is located
in the left rear quarter panel.
STOP LAMP RELAY
Power for the coil side of the stop lamp relay is
supplied by circuit L50. This circuit connects to the
stop lamps. Ground for the coil side is supplied on
circuit Z1.
When the operator depresses the brake pedal, volt-
age flows through the coil of the relay to ground
causing the contacts in the relay to close connecting
circuits A11 and 95.
Circuit 95 connects to the left and right turn signal
relays. Voltage flows through the closed contacts in
the relays to the trailer tow connector.
RIGHT TURN RELAY
Power for the coil side of the right turn relay is
supplied by circuit L60. This circuit connects to the
right side turn signal lamps. Ground for the coil side
of the relay is supplied on circuit Z1.
When the operator turns the right turn signal ON,
power flows through the coil in the relay to ground
causing the contacts in the relay to switch from there
normally CLOSED position to connect circuits 94 and
L60.
Circuit 94 is the feed for the contact side of the re-
lay. Circuit L60 connects from the relay to the trailer
tow connector.
Circuit 94 is fed power through the normally
CLOSED side of the stop lamp relay and circuit A11.
The A11 circuit is HOT at all times and protected by
a 10 amp circuit breaker located in the left rear
quarter panel.
LEFT TURN RELAY
Power for the coil side of the left turn relay is sup-
plied by circuit L61. This circuit connects to the left
side turn signal lamps. Ground for the coil side of the
relay is supplied on circuit Z1.
When the operator turns the left turn signal ON,
power flows through the coil in the relay to ground
causing the contacts in the relay to switch from there
normally CLOSED position to connect circuits 94 and
L61.
Circuit 94 is the feed for the contact side of the re-
lay. Circuit L61 connects from the relay to the trailer
tow connector.
Circuit 94 is fed power through the normally
CLOSED side of the stop lamp relay and circuit A11.
The A11 circuit is HOT at all times and protected by
a 10 amp circuit breaker located in the right rear
quarter panel.
HELPFUL INFORMATION
²Check the In-Line circuit breaker
DIAGRAM INDEX
Component Page
Circuit Breaker (In-Line)....................8W-54-4
Electric Brake Provision....................8W-54-2
Fuse 1 (Fuse Block).......................8W-54-4
Fuse 3 (PDC)...........................8W-54-4
Left Turn Signal Relay.....................8W-54-3
Left Back-Up Lamp.......................8W-54-2
Left Side Marker Lamp.....................8W-54-2
Left Tail/Stop Lamp.......................8W-54-2
Left Turn Signal Lamp.....................8W-54-2
Right Turn Signal Relay....................8W-54-3
Stop Lamp Relay.........................8W-54-3
Trailer Tow Connector......................8W-54-2
J8W-54 TRAILER TOWÐXJ-RHD 8W - 54 - 1

CONNECTOR LOCATIONS
GENERAL INFORMATION
This section provides illustrations identifying com-
ponent and connector locations in the vehicle. A con-nector index is provided. Use the wiring diagrams in
each section for connector number identification. Re-
fer to the index for the proper figure number.
CONNECTOR LOCATIONS
Connector # Color Location Fig.
C101......BK ...Front Left of Engine Compartment . .2
C102......BK ...InFront of Washer Fluid Reservoir . .2
C103......BK ...Bottom of Washer Fluid Reservoir . .2
C104......BK ...Bottom of Washer Fluid Reservoir . .2
C105......BK ...TopofWasher Fluid Reservoir.....2
C106......BK ...TopofRadiator Fan Housing......2
C107......BK ...Left Fender Side Shield.........2
C108......BK ...Left Fender Side Shield.........2
C109......BK ...Near Air Cleaner..............2
C110......BK ...Left Corner of Engine Compartment .2
C111......BK ...Rear of Intake Manifold.........4
C112......BK ...OnThrottle Body.............4
C113......BK ...OnThrottle Body.............4
C114......BK ...Rear of Intake Manifold.........4
C115......GN ...Lower Right of I.P.
C116......BK ...Near ABS Control Module
C117......GN ...Center of Dash Panel...........2
C118......BK ...Injector No. 6...............4
C119......BK ...Injector No. 5...............4
C120......BK ...Injector No. 4...............4
C121......BK ...Injector No. 3...............4
C122......BK ...Injector No. 2...............4
C123......BK ...Injector No. 1...............4
C124......BK ...OnEngine, Behind Power
Steering Pump.............4
C125......BK ...OnThermostat Housing.........4
C126......BK ...OnABSControl Module.........7
C127......BK ...Near ABS Control Module........7
C128......BK ...Near Distributor..............4
C129......BK ...Near Center of Dash Panel.......3
C130......GY ...Near Center of Dash Panel.......3
C131......BK ...Near Left Kick Panel
C132......BK ...OnSteering Column...........6
C133......BK ...Near Center of Dash Panel.......3
C134......BK ...Center of Dash Panel...........3
C135......BK ...Below Brake Master Cylinder......3
C136......BK ...Right Corner of Engine Compartment .3
C137......BK ...Right Side of Hood............3
C138......BK ...Near ABS Control Module
C139......BK ...Near ABS Control Module........7
C140......GY ...Near ABS Control Module........7
C141......GN ...Near ABS Control Module........7
C142......BK ...Right Fender Side Shield........3
C143......BK ...Right Fender Side Shield........3
C144......BK ...Right Fender Side Shield........3
C145......BK ...Right Fender Side Shield........3
C146......BK ...Below Battery................3
C147......BK ...Rear of Battery...............5
C148......BK ...AtStarter Motor..............4
C149......BK ...Right Side of Engine Near Distributor .4
C150......BK ...Rear of Generator.............4
C151......BK ...Rear of Generator.............5Connector # Color Location Fig.
C152......BK ...Behind Lens................1
C153......BK ...Left Rear of Radiator Closure Panel .1
C154......BK ...Behind Lens................1
C155......BK ...Behind Lens................1
C156......BK ...Behind Lens................1
C157......BK ...Center of Grille Opening.........1
C158......BK ...Center of Grille Opening.........1
C159......BK ...Behind Lens................1
C160......BK ...Behind Lens................1
C201......GY ...Center Bottom of I.P............8
C202......WT ...Center Bottom of I.P............8
C203......BK ...Behind Right Kick Panel........12
C204......BK ...Right Side of I.P.
C205......BK ...Left Rear of I.P...............8
C206......BK ...Left Rear of I.P...............8
C207......BK ...Near Right Kick Panel..........7
C208......GN ...Near Right Kick Panel..........7
C209......RD ...Behind Right Kick Panel........12
C210......BK ...Behind Fender Side Shield
C211......BK ...Near Right Kick Panel..........7
C212......BK ...Near Right Kick Panel
C213......BK ...Rear of Headlamp Switch.......10
C214......BK ...Rear of I.P., Right of Steering
Column..................9
C215......BK ...Rear of I.P., Right of Steering
Column..................9
C216......BK ...Rear of I.P., Right of Steering
Column.................9
C217......RD ...Rear of I.P., Right of Steering
Column..................9
C218......BK ...Below Stop Lamp Switch........7
C219......BK ...Rear of I.P., Right of Steering
Column.................9
C220......NAT ..Rear of I.P. Cluster...........10
C221......BK ...Rear of I.P. Cluster...........10
C222......NAT ..Rear of I.P., Left of Steering Column .9
C223......BK ...Rear of I.P., Left of Steering Column .9
C224......BK ...Rear of I.P., Left of Steering Column .9
C225......BK ...Rear of I.P., Left of Steering Column .9
C226......BK ...OnSteering Column...........6
C227......BK ...Near ABS Control Module........7
C228......WT ...Center of I.P.
C229......BK ...Center of I.P.
C230......BK ...OnSteering Column...........6
C231......BK ...OnSteering Column...........6
C232......BK ...OnSteering Column...........6
C233......BK ...Center Bottom of I.P............8
C234......BK ...Rear of I.P., Above Ash Receiver . . .8
C235......BK ...Rear of Radio...............9
C236......BR ...Rear of A/C-Heater Controls.....10
C237......BK ...Center Bottom of I.P............8
C238......BK ...Near ABS Control Module........7
J8W-90 CONNECTOR LOCATIONSÐXJ-RHD 8W - 90 - 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

switch to ground on circuit Z1. The switch closes dur-
ing periods of high power steering pump load and
low engine speed; such as parking maneuvers. Cir-
cuit K10 connects to cavity 10 of the PCM.
TACHOMETER SIGNAL
The Powertrain Control Module (PCM) supplies the
signal for the tachometer on circuit G21. Circuit G21
connects to cavity 43 of the PCM.
MALFUNCTION INDICATOR LAMP (MIL)
The Powertrain Control Module (PCM) provides
ground for the instrument cluster malfunction indica-
tor lamp on circuit G3. The MIL displays the mes-
sage CHECK ENGINE when illuminated. Circuit G5
provides voltage for the lamp.
DATA LINK CONNECTOR
Circuit G50 supplies battery voltage to the data
link connector. Circuit G50 originates at fuse 5 in the
fuse block. Circuit G50 is double crimped at the data
link connector and connects to cavity 9 of the Power-
train Control Module (PCM).
Circuit A21 from the ignition switch powers fuse 5
when the switch is in the START or RUN positions.
In the START or RUN position the ignition switch
connects circuit A1 from fuse 4 in the Power Distri-
bution Center (PDC) with circuit A21.
Circuit D20 connects to cavity 45 of the PCM. Cir-
cuit D20 is the SCI receive circuit for the PCM.
Circuit D21 connects to cavity 25 of the PCM. Cir-
cuit D21 is the SCI transmit circuit for the PCM.
Circuit Z11 provides ground for the data link con-
nector. Circuit Z11 splices to circuit Z1 which termi-
nates at the right rear of the engine. Circuit Z11 also
connects to cavity 5 of the PCM.
HELPFUL INFORMATION
²Circuit Z1 also supplies a ground for the PCM
high current drivers.
²If the system loses ground for the Z1 and Z11 cir-
cuits at the right rear of the engine, the vehicle will
not operate. Check the connection at the ganged-
ground circuit eyelet.
BRAKE SWITCH INPUT
Circuit V40 provides the brake switch input to the
Powertrain Control Module (PCM). Circuit V40 con-
nects to cavity 29 of the PCM.
POWER (DEVICE) GROUND
Circuit Z11 connects to cavities 11 and 12 of the
Powertrain Control Module (PCM). The Z1 circuit
provides ground for PCM internal drivers that oper-
ate high current devices like the injectors and igni-
tion coil.
Internal to the PCM, the power (device) ground cir-
cuit connects to the PCM sensor return circuit (from
circuit K4).
HELPFUL INFORMATION
²The grounding point for circuit Z1 is the right rear
of the engine.
²If the system loses ground for the Z1 circuits at
the rear of the engine, the vehicle will not operate.
Check the connection at the ganged-ground circuit
eyelet.
DIAGRAM INDEX
Component Page
Automatic Shut Down Relay...............8W-30-6, 14
Camshaft Position Sensor................8W-30-10, 16
Crankshaft Position Sensor...............8W-30-10, 16
Data Link Connector...................8W-30-11, 17
Daytime Running Lamps (DRL) Module.......8W-30-11, 17
Engine Coolant Temperature Sensor..........8W-30-9, 18
Fuel Pump Relay........................8W-30-20
Fuel Tank Level Unit......................8W-30-21
Fuse 1 (PDC)........................8W-30-6, 14
Fuse 4 (PDC)........................8W-30-6, 14
Fuse 5 (Fuse Block).................8W-30-6, 14, 20
Heated Oxygen Sensor..................8W-30-7, 15
Idle Air Control Motor..................8W-30-12, 18
Ignition Switch.....................8W-30-6, 14, 20
Ignition Coil........................8W-30-12, 18
Injectors (4.0L).........................8W-30-13
Injectors (2.5L)..........................8W-30-8
Instrument Cluster....................8W-30-11, 17
Intake Air Temperature Sensor.............8W-30-9, 18
MAP Sensor.........................8W-30-9, 18
Power Steering Pressure Switch..............8W-30-12
Powertrain Control Module.............8W-30-6 thru 21
Throttle Position Sensor.................8W-30-9, 18
Vehicle Speed Sensor..................8W-30-11, 17
J8W-30 FUEL/IGNITIONÐYJ VEHICLES 8W - 30 - 5