fuse block JEEP CHEROKEE 1995 Service Owner's Manual

DIAGNOSIS - YJ
WINDSHIELD WIPER SYSTEM
(1) Remove circuit breaker from fuseblock module
and turn ignition switch to ACCESSORY or ON.
(a) Measure voltage at battery side of circuit
breaker cavity. Meter should read battery voltage.
If not OK, repair wiring from ignition switch.
(b) Measure resistance across circuit breaker ter-
minals. Meter should read zero ohms. If not OK,
replace failed circuit breaker.
(2) Unplug wiper motor side of wiring harness con-
nector (gray) from wiper switch side of wiring har-
ness connector (black), or from intermittent wipe
module (if equipped) at base of steering column. Turn
ignition switch to ACCESSORY or ON.
(a) Measure voltage at unplugged wiper motor
side of wiring harness connector (gray) terminal D.
Meter should read battery voltage. If not OK, re-
pair wiring from circuit breaker.
(b) Turn ignition switch to OFF and measure re-
sistance from unplugged wiper motor side of wiring
harness connector (gray) terminal G to ground.
Meter should read zero ohms. If not OK, repair
wiring to ground.
(3) Leave ignition switch in OFF, and back probe
wiring harness connector at wiper motor. Measure re-
sistance from terminal E of wiper motor side of con-
nector to ground. Meter should read zero ohms. If not
OK, repair wiring to ground.
(4) If equipped with intermittent wipe, turn igni-
tion switch to ACCESSORY or ON. Turn wiper
switch to LOW or HIGH. Unplug wiper switch side of
wiring harness connector (black) from intermittent
wipe module. Then plug both connectors that have
been removed from intermittent wipe module into
each other.
CAUTION: DO NOT move the wiper switch to DE-
LAY with the intermittent wipe module removed
from the circuit. If the switch is moved to the DE-
LAY position during the next step, the switch will be
damaged.
Test wiper operation in LOW and HIGH speed
modes, and test washer operation. If these modes
were inoperative, but are OK now, replace failed in-
termittent wipe module.
(5) To test the wiper/washer switch, see Windshield
Wiper/Washer Switch Testing. Turn ignition switch to
OFF. Position the wiper switch as indicated, and
back probe wiper switch side of wiring harness con-
nector (black). If switch tests OK, go to step 6. If not
OK, replace switch and go to step 7.
(6) To further test the wiper/washer switch, turn
ignition switch to ACCESSORY or ON. Position thewiper switch as indicated in the tests below, and
back probe wiper switch side of wiring harness con-
nector (black).
(a) Measure voltage at connector terminal E with
wiper switch in LOW, MIST and with washer
switch depressed. Meter should read battery volt-
age. If not OK, replace switch.
(b) Measure voltage at connector terminal C with
wiper switch in HIGH. Meter should read battery
voltage. If not OK, replace switch.
(c) With wiper switch in LOW or HIGH, measure
voltage at connector terminal F, then move wiper
switch to OFF. Meter should read battery voltage
until wipers park and then zero volts. If OK, go to
step 7. If not OK, check wiring to wiper motor, then
go to step 8.
(7) To test the wiper motor, turn the ignition
switch to ACCESSORY or ON. Position the wiper
switch and back probe the motor connector as indi-
cated.
(a) Wiper switch in any position, measure volt-
age at terminal B. Meter should read battery volt-
age. If not OK, repair wiring from circuit breaker.
(b) Wiper switch in LOW, measure voltage at ter-
minal A. Meter should read battery voltage. If OK,
but wipers do not operate, replace failed wiper mo-
tor. If not OK, repair wiring from switch or inter-
mittent wipe module connector.
(c) Wiper switch in HIGH, measure voltage at
terminal H. Meter should read battery voltage. If
OK, but wipers do not operate, replace failed wiper
motor. If not OK, repair wiring from switch or in-
termittent wipe module connector.
(d) Wiper switch in LOW or HIGH, voltmeter
connected to terminal D. Turn wiper switch to OFF
and observe meter. Meter should read battery volt-
age when switch goes to OFF, then zero volts after
wipers park. If battery voltage is present, but wip-
ers fail to park; or, if no battery voltage present, re-
place failed wiper motor.
WINDSHIELD WASHER SYSTEM
WITH NON-INTERMITTENT WIPE
(1) Measure resistance from washer pump connec-
tor terminal B to a clean chassis ground. Meter
should read zero ohms. If not OK, repair open be-
tween terminal B and ground.
(2) Turn ignition switch to ON and press washer
switch.
(a) Measure voltage at switch connector terminal
B. Meter should read battery voltage. If not OK, re-
place wiper/washer switch.
(b) Measure voltage at washer pump connector
terminal A. Meter should read battery voltage. If
8K - 12 WIPER AND WASHER SYSTEMS - YJJ

REAR WINDOW DEFOGGER
CONTENTS
page page
DIAGNOSIS............................. 1
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 3
GENERAL INFORMATION
The electrically-heated rear window defogger is an
available option on XJ (Cherokee), and YJ (Wrangler)
models equipped with the hardtop roof option. Fol-
lowing are general descriptions of the major compo-
nents in the rear window defogger system. Refer to
Group 8W - Wiring Diagrams for complete circuit de-
scriptions and diagrams.
REAR WINDOW GLASS GRID
The heated rear window glass has two electrically-
conductive vertical bus bars and a series of horizon-
tal grid lines made of a silver-ceramic material,
which is baked on and bonded to the inside surface of
the glass. The grid lines and bus bars comprise a
parallel electrical circuit.
When the rear window defogger switch is placed in
the ON position, current is directed to the rear win-
dow grid lines through the bus bars. The grid lines
heat the rear window to clear the surface of fog or
snow. Circuit protection for the heated grid circuit is
provided by fuse 18 (XJ) or fuse 6 (YJ) in the fuse-
block module.
The grid lines and bus bars are highly resistant to
abrasion. However, it is possible for an open to occur
in an individual grid line resulting in no current flow
through the line. The grid lines can be damaged or
scraped off with sharp instruments. Care should be
taken in cleaning the glass or removing foreign ma-
terials, decals or stickers. Normal glass cleaning sol-
vents or hot water used with rags or toweling is
recommended.A repair kit is available to repair the grid lines and
bus bars, or to reinstall the heated glass pigtail
wires.
DEFOGGER SWITCH
The rear window defogger switch is mounted in the
instrument panel left of the steering column for XJ,
or right of the steering column for YJ. The switch cir-
cuit is protected by fuse 8 (XJ) or fuse 9 (YJ) in the
fuseblock module. Actuating the switch energizes the
relay and electronic timer. A light-emitting diode
(LED) in the switch (XJ), or a indicator lamp in the
switch (YJ), illuminates to indicate when the system
is turned on. The defogger switch can not be re-
paired. If faulty, the switch must be replaced.
DEFOGGER RELAY/TIMER
The defogger relay/timer is located in the relay cen-
ter on XJ models, or taped to the instrument panel
wiring harness behind the parking brake pedal in the
left cowl side area on YJ models. When the rear de-
fogger switch is actuated, the rear defogger relay is
energized. This causes current to flow through the
grid circuit for approximately 10 minutes, or until
the rear window defogger switch or ignition switch
are turned off.
DIAGNOSIS
SYSTEM TESTS
Electrically-heated rear window defogger operation
can be confirmed in the following manner:
(1) Turn the ignition switch to the ON position.
(2) Turn rear window defogger control switch ON.
(3) Monitor vehicle voltmeter. With the control
switch ON, a distinct needle deflection should be
noted.(4) The rear window defogger operation can be
checked by feeling the glass. A distinct difference in
temperature between the grid lines and adjacent
clear glass can be detected within 3 to 4 minutes of
operation.
(5) Using a DC voltmeter, contact terminal A (Fig.
1) (passenger side) with the negative lead, and termi-
JREAR WINDOW DEFOGGER 8N - 1

nal B (driver side) with the positive lead. The volt-
meter should read 10-14 volts.
Steps 3, 4 or 5 above will confirm system operation.
Indicator light illumination means that there is
power available at the output of the switch, but does
not confirm that power is reaching the rear window
grid lines.
If the rear window defogger does not operate, the
problem should be isolated in the following manner:
(1) Confirm that ignition switch is in ON position.
(2) Ensure that the heated rear window feed and
ground wires are connected to the glass. Confirm
that the ground wire has continuity to ground.
(3) Check fuses 8 and 18 (XJ), or fuses 6 and 9
(YJ) in fuseblock module. Fuses must be tight in
their receptacles and all electrical connections must
be secure.
When the above steps have been completed and the
system is still inoperative, one or more of the follow-
ing is faulty:
²defogger switch²relay/timer
²rear window grid lines (all grid lines would have
to be broken or one of the feed wires disconnected for
the entire system to be inoperative).
If turning the switch ON produces severe voltmeter
deflection, check for a short circuit.
REAR WINDOW GLASS GRID
To detect breaks in grid lines, the following proce-
dure is required:
(1) Turn ignition switch to the ON position. Turn
rear defogger switch ON. The indicator lamp should
light.
(2) Using a 12-volt DC voltmeter, contact vertical
bus bar on passenger side of vehicle (point A of Fig.
1) with negative lead of voltmeter. With positive lead
of voltmeter, contact vertical bus bar on driver side of
vehicle (point B of Fig. 1). The voltmeter should read
10-14 volts.
(3) With negative lead of voltmeter, contact a good
body ground point. The voltage reading should not
change. A different reading indicates a poor ground
connection.
(4) Connect negative lead of voltmeter to point A
on passenger side bus bar and touch each grid line at
mid-point with positive lead. A reading of approxi-
mately 6 volts indicates a line is good. A reading of
zero volts indicates a break in the grid line between
mid-point C and point B. A reading of 10-14 volts in-
dicates a break between mid-point C and point A.
Move toward break and voltage will change as soon
as break is crossed.
Fig. 1 Rear Window Glass Grid Test
8N - 2 REAR WINDOW DEFOGGERJ

DIAGNOSIS
As a preliminary system diagnosis, note system op-
eration while you actuate both the Lock and Unlock
functions with the power lock switches and the key-
less entry transmitter. Then, proceed as follows:
²If system fails to function with either the switches
or the transmitter, see Power Lock System diagnosis.
²If system functions with both switches, but not the
transmitter, see Keyless Entry Transmitter diagnosis.
²If system functions with transmitter, but not with
one or both switches, see Power Lock System diagno-
sis.
²If one lock fails to operate with the switches or
transmitter, see Power Lock Motor diagnosis.
POWER LOCK SYSTEM
(1) Inspect fuse 13 in fuseblock module. Replace if
necessary. If OK, measure voltage at battery side of
fuse. There should be 12 volts. If not OK, repair open
from Power Distribution Center.
(2) Remove door switch(es) and measure voltage at
terminal 1. Meter should read battery voltage. If OK,
go to next step. If not OK, repair open to fuse 9 in
fuseblock module.
(3) Check door switch continuity as shown in the
applicable charts on the following pages. If OK, go to
next step. If not OK, replace switch.
(4) The power lock/unlock relays are in the relay
center. The relay center is located on the lower in-
strument panel reinforcement just right of the steer-
ing column (Fig. 1). Remove both relays.
(5) Measure resistance between lock and unlock re-
lay terminal 4 (87A) and ground. Meter should read
zero ohms. If OK, go to next step. If not OK, repair
open to ground.
(6) Measure voltage at terminal 2 (87) of both the
lock and unlock relays. Meter should read battery
voltage. If OK, go to next step. If not OK, repair open
to fuse 13 in fuseblock module.(7) Measure resistance between lock and unlock re-
lay terminal 5 (85) and ground. Meter should read
zero ohms. If OK, go to next step. If not OK, repair
open to ground.
(8) Hold driver's side switch in LOCK position.
Measure voltage at lock relay terminal 3 (86). Meter
should read battery voltage. If OK, go to next step. If
not OK, repair open to driver's side switch.
(9) Hold driver's side switch in UNLOCK position.
Measure voltage at unlock relay terminal 3 (86).
Meter should read battery voltage. If OK, go to next
step. If not OK, repair open to driver's side switch.
(10) Hold driver's side switch in LOCK position.
Measure voltage at lock relay terminal 1 (30). Meter
should read battery voltage. If OK, go to next step. If
not OK, replace lock relay.
(11) Hold driver's side switch in UNLOCK position.
Measure voltage at unlock relay terminal 1 (30).
Meter should read battery voltage. If OK, see Power
Lock Motor diagnosis. If not OK, replace unlock re-
lay.Fig. 1 Power Lock/Unlock Relays
8P - 2 POWER LOCKSJ

POWER LOCK MOTOR
(1) Once it is determined which lock motor is inop-
erative, that motor can be tested. Disconnect the wire
connector at the motor. Apply 12 volts to the motor
terminals to check its operation in one direction. Re-
verse the polarity to check the operation in the other
direction. If OK, repair circuits to power lock/unlock
relays as required. If not OK, replace the motor.
(2) If all lock motors are inoperative, the problem
may be caused by one shorted motor. Disconnecting a
shorted motor will allow the good motors to operate.
Disconnect each motor connector, one at a time, and
re-check both lock and unlock functions while operat-
ing the door lock switch. If disconnecting one motor
causes the other motors to become functional, go
back to step 1 to test the disconnected motor.
KEYLESS ENTRY TRANSMITTER
(1) Depress either transmitter button and note
whether red Light-Emitting Diode (LED) on trans-
mitter case lights. If OK, go to next step. If not OK,
replace batteries as described under Keyless Entry
Transmitter in Service Procedures. Test transmitter
operation. If OK, discard faulty batteries. If not OK,
go to next step.
(2) Perform transmitter program procedure with
suspect transmitter and another known good trans-
mitter, as described in Service Procedures. Test oper-
ation with both transmitters. If both transmitters fail
to operate power locks, see Keyless Entry Module di-
agnosis. If known good transmitter operates power
locks and suspect transmitter does not, replace faulty
transmitter. Be certain to perform transmitter pro-
gram procedure again when replacing faulty trans-
mitter and to erase test transmitter access code from
keyless entry module.
KEYLESS ENTRY MODULE
(1) Check fuse 9 in fuseblock module. If OK, go to
next step. If not OK, replace fuse.
(2) Check for battery voltage at fuse 9. If OK, go to
next step. If not OK, repair circuit from power distri-
bution center.
(3) Access keyless entry module connectors as de-
scribed in Keyless Entry Module Remove/Install.
(4) Unplug module connector from module. Check
connector and receptacle in module for loose, cor-
roded, or damaged terminals and pins. If OK, go to
next step. If not OK, repair as required.
(5) Probe connector cavity for module terminal 1
and check for battery voltage. If OK, go to next step.
If not OK, repair circuit to fuse 9 as required.
(6) Install a jumper wire from connector cavity for
module terminal 1 to connector cavity for module ter-
minal 3. Doors should lock. If OK, go to step 8. If not
OK, go to next step.
(7) Check for continuity between connector cavity
for module terminal 3 and lock relay terminal 3 (86).
There should be continuity. If OK, replace lock relay.
If not OK, repair circuit as required.
(8) Install a jumper wire from connector cavity for
module terminal 1 to connector cavity for module ter-
minal 4. Doors should unlock. If OK, replace module.
If not OK, go to next step.
(9) Check for continuity between connector cavity
for module terminal 4 and unlock relay terminal 3
(86). There should be continuity. If OK, replace un-
lock relay. If not OK, repair circuit as required.
JPOWER LOCKS 8P - 7

POWER SEATS
CONTENTS
page page
DIAGNOSIS............................. 2
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 3
GENERAL INFORMATION
A six-way driver's side power seat is an available
option on XJ (Cherokee) models. The power seat sys-
tem receives battery feed through fuse 6 in the power
distribution center and circuit breaker 16 in the fuse-
block module at all times.
Following are general descriptions of the major
components in the power seat system. Refer to Group
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.
POWER SEAT SWITCH
The power seat can be adjusted in six different
ways using the power seat switch (Fig. 1). The switch
is located on the lower outboard side of the seat
cushion. Refer to the owner's manual for more infor-
mation on power seat switch functions and seat ad-
justing procedures. The individual switches cannot be
repaired. If one switch fails, the entire switch module
must be replaced.
POWER SEAT ADJUSTER/MOTORS
There are three reversible motors that operate the
power seat adjuster. The motors are connected to
worm-drive gearboxes in the adjuster by drive cables.
The front and rear of a seat are operated by differ-
ent motors. They can be raised or lowered indepen-
dently of each other. When the center seat switch is
pushed to the UP or DOWN position, both front and
rear motors operate in unison, moving the entire seat
up or down. The forward-rearward motor is operated
by pushing the center seat switch to the FORWARD
or REARWARD position.
When a switch is actuated, battery feed and a
ground path are applied through the switch contacts
to the motor(s). The motor(s) operate to move the
seat in the selected direction until the switch is re-
leased, or until the travel limit of the power seat ad-juster is reached. When the switch is moved in the
opposite direction, the battery feed and ground path
to the motor(s) are reversed through the switch con-
tacts. This causes the motor to run in the opposite di-
rection.
Each motor contains a self-resetting circuit breaker
to protect it from overload. Consecutive or frequent
resetting must not be allowed to continue or the mo-
tors may be damaged. Make the necessary repairs.
The power seat adjuster and motors can not be re-
paired, and are serviced only as a complete unit. If
any component in this unit should fail, the entire as-
sembly must be replaced.
Fig. 1 Power Seat Switch
JPOWER SEATS 8R - 1

DIAGNOSIS
Before any testing is attempted the battery should
be fully charged and all connections and pins cleaned
and tightened to ensure proper continuity and
grounds.
With the dome lamp on, apply switch in direction
of the failure. If the dome lamp dims, the seat may
be jamming. Check for binding or obstructions. If the
dome lamp does not dim, then proceed with the fol-
lowing electrical tests.
POWER SEAT ADJUSTER/MOTORS
Operate the power seat switch to move all three
seat motors. The seat should move in all directions.
If not OK, proceed as follows. If one or more motors
operate, see diagnosis for Power Seat Switch.
(1) Check circuit breaker 16 in the fuseblock mod-
ule. If OK, go to next step. If not OK, replace circuit
breaker.
(2) Remove switch mounting screws and check for
battery voltage at red wire at switch connector. If
OK, go to next step. If not OK, repair wiring to cir-
cuit breaker.(3) Check for continuity between black wire at
switch connector and a good ground. There should be
continuity. If OK, go to next step. If not OK, repair
wiring to ground.
(4) See diagnosis for Power Seat Switch. If switch
continuity checks OK, replace faulty motor/adjuster
assembly. If switch continuity is not OK, replace
faulty switch.
POWER SEAT SWITCH
To check the power seat switch, remove the switch
from its mounting position. Use an ohmmeter and
see the Power Seat Switch Continuity chart. Deter-
mine if switch continuity is correct. If OK, see Power
Seat Adjuster/Motors diagnosis. If not OK, replace
faulty switch assembly.
POWER SEAT SWITCH CONTINUITY
8R - 2 POWER SEATSJ

POWER WINDOWS
CONTENTS
page page
DIAGNOSIS............................. 1
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 7
GENERAL INFORMATION
Power door windows are optional equipment on XJ
(Cherokee) models. The power windows operate only
with the ignition switch in the ON position. This
group covers diagnosis and service of the electrical
components peculiar to the power window system.
For service of mechanical components such as the
regulator, lift plate or window tracks refer to Group
23 - Body Components.
Following are general descriptions of the major
components in the power window system. Refer to
Group 8W - Wiring Diagrams for complete circuit de-
scriptions and diagrams.
POWER WINDOW SWITCH
Both front and rear door windows can be raised or
lowered electrically by operating the four two-way
switches on the driver's door panel. A single two-way
switch on each passenger's door panel operates only
the window on that passenger's door. The switches
cannot be repaired. If faulty, they must be replaced.
POWER WINDOW MOTOR
A permanent magnet reversible motor moves the
window regulator through a cable and drum operat-ing mechanism. A positive and negative battery con-
nection to the two motor terminals will cause the
motor to rotate in one direction. Reversing current
through these same two connections will cause the
motor to rotate in the opposite direction. In addition,
each power window motor is equipped with an inte-
gral automatic re-setting circuit breaker to protect
the motor from overloads. The power window motor
and regulator assembly cannot be repaired. If faulty,
the entire assembly must be replaced.
CIRCUIT BREAKER
An automatic re-setting circuit breaker in the fuse-
block module is used to protect the power window
system circuit. The circuit breaker can protect the
system from a short circuit, and can also protect the
system from an overload condition caused by an ob-
structed or stuck window glass or regulator. The cir-
cuit breaker can not be repaired. If faulty, it must be
replaced.
DIAGNOSIS
It is necessary that the window be free to slide up
and down for the power window system to function
properly. If the window is not free to move up and
down, the motor will overload and trip the circuit
breaker. To determine if the glass is free, disconnect
regulator plate from the glass and slide window up
and down by hand.
An alternate method is to shake the glass in the
door, with the glass positioned between the up and
down stop positions. Check that the glass can be
moved slightly from side to side, front to rear, and up
and down. Then check that window is not boundtight in the tracks. If window is free, proceed with di-
agnosis that follows. If window is not free, refer to
Group 23 - Body Components for service procedures.
CIRCUIT BREAKER
Locate correct circuit breaker in fuseblock module.
Pull out slightly, but be sure that circuit breaker ter-
minals still contact terminals in fuseblock module.
Turn ignition switch to ON position. Connect ground
wire of voltmeter to a good ground. With probe of
voltmeter positive lead, check both terminals of cir-
cuit breaker for battery voltage. If only one terminal
JPOWER WINDOWS 8S - 1

POWER MIRRORS
CONTENTS
page page
DIAGNOSIS............................. 1
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 4
GENERAL INFORMATION
Power outside rear view mirrors are an available
option on XJ (Cherokee) models. Following are gen-
eral descriptions of the major components in the
power mirror system. Refer to Group 8W - Wiring Di-
agrams for complete circuit descriptions and dia-
grams.
POWER MIRROR
The power mirrors are connected to battery feed at
all times. Each mirror head contains two electric mo-
tors, two drive mechanisms and the mirror glass.
One motor and drive controls mirror up-and-down
movement, and the other controls right-and-left
movement.
The mirror glass is the only serviced replacement
part for the power mirror assembly. If any other com-ponent of the mirror unit is faulty or damaged, the
entire assembly must be replaced.
POWER MIRROR SWITCH
Both the right and left mirror are controlled by a
multi-function switch located on the front of the cen-
ter console storage compartment, directly below the
armrest. The selector switch is moved right (right
mirror control), left (left mirror control), or center to
turn power mirrors off. Then one of four directional
control buttons is depressed to control movement of
the selected mirror up, down, right, or left. The
power mirror switch is serviced only as a complete
unit.
DIAGNOSIS
POWER MIRROR SYSTEM
(1) Check fuse 16 in Power Distribution Center
(PDC) and fuse 9 in fuseblock module. If OK, go to
next step. If not OK, replace fuse.
(2) Check for battery voltage at fuse 9 in fuseblock
module. If OK, go to next step. If not OK, repair cir-
cuit to fuse 16 in PDC.
(3) Remove power mirror switch from the center
console. See Power Mirror Switch Remove/Install.
(4) Disconnect wiring harness connector from
switch. Check for battery voltage at pink wire. If OK,
go to next step. If not OK, repair circuit to fuse 9 in
fuseblock module.
(5) Check for continuity between black wire in
switch harness connector and a good ground. There
should be continuity. If OK, go to next step. If not
OK, repair circuit to ground.
(6) Check switch continuity as shown in the Mirror
Switch Continuity charts. If OK, go to next step. If
not OK, replace switch.(7) See Power Mirror Switch illustration. Connect
a jumper wire from mirror switch connector cavity
for pin E to cavity for pin F. Now connect a second
jumper from connector cavity for pin G to each of the
following pin cavities: A, B, C, then D. In each case,
the selected mirror head should move. If OK, replace
switch. If not OK, go to next step.
(8) Remove door trim panel and unplug power mir-
ror connector inside door. Connect one jumper wire to
a good ground and a second jumper wire to a battery
feed. Connect other ends of jumpers to the mirror
side of connector in door (refer to Group 8W - Wiring
Diagrams for connector cavity identification). Mirror
head should move in each of the four directions. If
OK, repair wiring between mirror switch and door
connectors. If not OK, replace mirror.
JPOWER MIRRORS 8T - 1

CHIME/BUZZER WARNING SYSTEMS
CONTENTS
page page
DIAGNOSIS............................. 2
GENERAL INFORMATION.................. 1SERVICE PROCEDURES................... 4
GENERAL INFORMATION
This group covers the buzzer warning system,
which is standard equipment on XJ (Cherokee)/YJ
(Wrangler) models. The system provides an audible
warning to the driver when it monitors the following
conditions:
²key is in ignition switch with the driver's door
open
²head or park lamps are on with driver's door open
(XJ only)
²driver's seat belt is not buckled with ignition
switch in ON position.
Following are general descriptions of the major
components in the buzzer warning system. Refer to
Group 8W - Wiring Diagrams for complete circuit de-
scriptions and diagrams.
BUZZER MODULE
The buzzer module is located in the fuseblock mod-
ule under the left end of the instrument panel. It re-
ceives battery voltage at all times from (fuse 15 - XJ,
fuse 3 - YJ) the fuseblock module. It also receives a
second battery feed (fuse 17 - XJ, fuse 9 - YJ) when
the ignition switch is in the ON or START position.
Other inputs to the module include the driver's door
jamb switch, the driver's seat belt switch, the ignition
key-in switch, and the headlamp switch (XJ only). The
only output of the module is a timed 4 to 8 second feed
to the seat belt reminder lamp in the message center of
the instrument cluster. The timer function begins after
the ignition switch is turned to the ON position.
The buzzer module can not be repaired. If faulty, it
must be replaced.
DRIVER'S DOOR JAMB SWITCH
The driver's door jamb switch is mounted to the
driver's door hinge pillar. The switch closes a path to
ground for the buzzer module through the key-in
switch or headlamp switch (XJ only) when the driv-
er's door is opened, and opens when the driver's door
is closed. This switch can not be repaired. If faulty, it
must be replaced.
IGNITION KEY-IN SWITCH
XJ MODELS
The key-in switch is integral to the ignition switch,
which is mounted on the right side of the steering col-
umn. It closes a path to ground for the buzzer module
when the ignition key is inserted in the ignition lock cyl-
inder and the driver's door jamb switch is closed (door
open). The switch opens when the key is removed from
the ignition lock cylinder. This switch can not be re-
paired. If faulty, the entire ignition switch must be re-
placed. Refer to Group 8D - Ignition Systems for service
procedures.
YJ MODELS
The key-in switch is mounted within the steering col-
umn in the lock cylinder housing. It closes a path to
ground for the buzzer module when the ignition key is
inserted in the ignition lock cylinder and the driver's
door jamb switch is closed (door open). The switch opens
when the key is removed from the ignition lock cylinder.
This switch is available for service replacement. Refer
to Group 19 - Steering for service procedures.
HEADLAMP SWITCH (XJ ONLY)
The headlamp switch is located in the instrument
panel. It closes a path to ground for the buzzer module
when the park or headlamps are on and the driver's
door jamb switch is closed (door open). The switch opens
the ground path when the park and headlamps are
turned off. The headlamp switch can not be repaired. If
faulty, it must be replaced. Refer to Group 8E - Instru-
ment Panel and Gauges for service procedures.
DRIVER'S SEAT BELT SWITCH
The driver's seat belt switch is integral to the driv-
er's seat belt buckle-half assembly. The switch is nor-
mally closed, providing a ground path to the buzzer
module. When the tip-half of the seat belt is inserted
into the seat belt buckle, the switch opens the buzzer
module ground path. The seat belt switch can not be
repaired. If faulty, the entire driver's seat belt buck-
le-half must be replaced. Refer to Group 23 - Body
Components for service procedures.
JCHIME/BUZZER WARNING SYSTEMS 8U - 1