Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1988-1989.1993-1995 Approved 1994 XJ Jeep Cherokee 94XJ_8P
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J POWER DOOR LOCKS 8P - 1
POWER DOOR LOCKS
CONTENTS
page page
KEYLESS ENTRY ........................ 8 POWER LOCKS ......................... 1
POWER LOCKS
INDEX
page page
Actuator Motor Stall Test . . . . . . . . . . . . . . . . . . . . 6 Liftgate Lock Cylinder Replacement . . . . . . . . . . . . 7
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Solenoid and Latch Assembly Replacement ..... 6
Diagnosing Power Door Locks .. . . . . . . . . . . . . . 1 Switch Replacement . . . . . . . . . . . . . . . . . . . . . . . 6
General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
GENERAL NO DOOR LOCKS OPERATE USING DOOR
The door lock actuators, including liftgate, are con- LOCK SWITCHES
trolled by two-way switches. To lock the doors, push (1) Inspect fuse #13. Replace if necessary. If OK,
down on either switch. To unlock doors from inside measure voltage at battery side of fuse. There should
the vehicle push upward on either switch. be 12 volts. If not, repair open from Power Distribu-
The power door locks do not lock or unlock the tion Center.
doors from outside the vehicle. Insert the key into (2) Remove door switch and measure voltage at
the lock cylinder to lock or unlock each individual terminal 1. Meter should read battery voltage. If not,
door. repair open to #9 fuse.
(3) The power window relays are in the relay cen-
DESCRIPTION ter. The relay center is located on the lower instru-
The door locks are operated by reversible motors ment panel trim cover just right of the steering
that receive voltage from fuse #13 in the fuse panel. column (Fig. 1). Remove both relays.
Voltage is applied to the driver's side door lock (4) Measure resistance between lock and unlock re-
switch and the passenger's side door lock switch lay terminal 4 (87A) and ground. Meter should read
through the #9 fuse. With the driver's side door lock zero ohms. If not, repair open to ground.
switch in LOCK, voltage is applied through the (5) Measure voltage at terminal 5 (87) of both the
switch to the door lock relay coil. The relay coil is lock and unlock relays. Meter should read battery
energized which closes the circuit from the circuit voltage. If OK, next step. If not, repair open to cir-
breaker to the lock motor. The motor is grounded by cuit breaker.
the unlock relay. (6) Measure resistance at terminal 2 (85) of both
The passenger's side door lock window switch oper- the lock and unlock relays. Meter should read zero
ates the same as the driver's door switch. The volt- ohms. If not, repair open to ground.
age and ground paths are reversed to unlock the (7) Hold driver's side switch in LOCK position.
doors. Measure voltage at lock relay terminal 1 (86). Meter
The power door lock operates with battery power should read battery voltage. If OK, next step. If not,
and, therefore, is independent of the ignition switch. repair open to driver's side switch.
(8) Hold driver's side switch in UNLOCK position.
DIAGNOSING POWER DOOR LOCKS Measure voltage at unlock relay terminal 1 (86).
If vehicle has Keyless Entry and the door locks op-
Meter should read battery voltage. If OK, next step.
erate properly using door switches but do not work
If not, repair open to driver's side switch.
with transmitter, refer to Keyless Entry in this
group.
8P - 2 POWER DOOR LOCKS J
(9) Hold driver's side switch in LOCK position.
Measure voltage at lock relay terminal 3 (30). Meter
should read battery voltage. If OK, next step. If not,
replace lock relay.
(10) Hold driver's side switch in UNLOCK posi-
tion. Measure voltage at unlock relay terminal 3
(30). Meter should read battery voltage. If OK, check
connections and door motor. If not, replace unlock re-
lay.
(11) Repeat procedures for passenger's side switch.
Fig. 1 Door Lock/Unlock Relays
DRIVERS DOOR POWER LOCK SWITCH--2-DOOR LEFT HAND DRIVE
J POWER DOOR LOCKS 8P - 3
DRIVERS DOOR POWER LOCK SWITCH--2-DOOR RIGHT HAND DRIVE
8P - 4 POWER DOOR LOCKS J
DRIVERS DOOR POWER LOCK SWITCH--4-DOOR
J POWER DOOR LOCKS 8P - 5
PASSENGER DOOR LOCK SWITCH
8P - 6 POWER DOOR LOCKS J
ACTUATOR MOTOR STALL TEST
To test the actuator motor, connect an ammeter in
series with the motor and operate the door switch.
Replace the actuator motor if current draw exceeds 8
amps at room temperature or if the actuator does not
complete its travel in less than one second. Refer to
Solenoid and Latch Assembly Replacement procedures.
SWITCH REPLACEMENT
(1) Remove the interior door latch release assem-
bly and control panel retaining screws (Fig. 2).
Fig. 3 Power Lock Switch Removal
Fig. 2 Power Window/Lock Control Panel Removal/
Installation
(2) Disconnect the control linkage and the wire
harness connector.
(3) Remove the latch release and control panel as-
sembly.
(4) The switch is retained to the panel with clips
(Fig. 3). Push in on the retainer part of the clip and
pry the clips.
(5) To install switch, position switch and press in
retainer clips until they snap into position.
SOLENOID AND LATCH ASSEMBLY REPLACEMENT
(1) Remove interior door latch release assembly
and control panel retaining screws (Fig. 2).
(2) Disconnect control linkage and wire harness
connector.
(3) Remove latch release and control panel assem-
Fig. 4 Armrest Retainer Clip
bly.
(4) Remove armrest lower retaining screws. (10) Grind out or drill out the lock solenoid rivets
(5) Swing armrest downward to a vertical position. and remove solenoid with latch assembly and remote
This is necessary to disconnect armrest from upper control rods (Fig. 7).
retainer clip (Fig. 4). (11) Place lock solenoid, latch and remote control
(6) Pull armrest straight out from trim panel. rods in door.
(7) Remove trim panel with a wide flat blade tool (12) Attach lock solenoid to door panel with pop
(Fig. 5). rivets or nuts and screws.
To aid in removal of trim panel, start at bot- (13) Attach latch. Tighten screws to 9 N m (7 ft.
tom of panel. lbs.) torque.
(8) Remove plastic water dam sheet. (14) Install door trim panel and plastic water dam
(9) Remove latch retaining screws (Fig. 6). sheet.
J POWER DOOR LOCKS 8P - 7
Fig. 5 Trim Panel Removal
Fig. 7 Solenoid Removal/Installation
Fig. 8 Liftgate Trim Panel Removal
Fig. 6 Latch Removal/Installation
(15) Using an adhesive/sealant, install plastic wa-
ter dam sheet.
(16) Place trim panel in installation position and
press in the nylon retainers.
(17) Install armrest.
(18) Install latch release assembly and control
panel.
LIFTGATE LOCK CYLINDER REPLACEMENT
(1) Remove 2 screws at the top outside edges of the
liftgate trim panel.
(2) Remove trim panel with a wide flat blade tool
(Fig. 8).
To aid in removal of trim panel, start at bot-
Fig. 9 Lock Actuator Linkage Clip
tom of panel.
(3) Disconnect lock actuator linkage clip (Fig. 9).
(4) Remove 3 latch retaining screws (Fig. 10).
8P - 8 POWER DOOR LOCKS J
(5) Remove latch.
(6) Drill out 2 rivets and remove solenoid.
(7) To install solenoid, reverse the removal proce-
dures.
(8) Tighten latch screws to 9 N m (7 ft. lbs.) torque.
Fig. 10 Latch Assembly Removal/Installation
KEYLESS ENTRY
INDEX
page page
Diagnosing Power Door Locks ............... 9 System Operation . . . . . . . . . . . . . . . . . . . . . . . . . 9
Door Lock/Unlock Relay Replacement . . . . . . . . . 12 Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Transmitter Programming .. . . . . . . . . . . . . . . . . . 9
Receiver Service . . . . . . . . . . . . . . . . . . . . . . . . . 11 Transmitter Service . . . . . . . . . . . . . . . . . . . . . . . . 9
System Description . . . . . . . . . . . . . . . . . . . . . . . . 8
SYSTEM DESCRIPTION When the doors are locked, the keyless entry mod-
The keyless entry system consists of a portable re- ule applies voltage to the unlock relay coil and a
mote control transmitter and a receiver mounted in similar action takes places to unlock the doors.
the overhead console or between the sun visors. Sys-
tem operation is based on a coded infrared signal TRANSMITTER
from the transmitter to the receiver. The transmitter The pocket size, solid state transmitter operates on
is programmed into the receiver providing the correct (2) 3-volt lithium (CR1616) batteries (Fig. 1). The
programming sequence is met. transmitter is activated by pressing either the LOCK
When the keyless entry system is activated, the cor- or UNLOCK button. This closes the internal contacts
responding relay operates to supply voltage to the mo- that complete the battery circuit.
tors. The use of either relay determines the polarity of The battery voltage activates the transmitter diode
the voltage that is supplied to the door lock motors. which in turn generates a coded infrared signal. The
When the keyless entry system is used, the trans- signal is transmitted as pulses of infrared light.
mitter sends a signal to the keyless entry module. If If the red LED on the side of the transmitter does
the doors are unlocked, the module activates a tran- not light when the transmitter is activated, the bat-
sistor switch to apply voltage to the lock relay coil. teries are low.
The coil is energized to close the normally open con-
tacts of the lock relay. Battery voltage from the relay RECEIVER
The receiver is in circuit with the electric door lock
is applied to the door lock motors to lock the doors.
system. The coded infrared signal is picked up by the
Current flows in the same path to ground as it does
receiver diode and is shaped, amplified and decoded by
when the master door lock switch is used.
an integrated circuit within the receiver. If the signal
J POWER DOOR LOCKS 8P - 9
another transmitter at the receiver dome and press
the LOCK button for at least 5 seconds. The door
lock will cycle again.
(6) To lock the programmed codes into the re-
ceiver, the ignition switch must be turned OFF and
back ON within 20 seconds after programming the
last transmitter's code. At that time, all previous
codes are erased from the module.
DIAGNOSING POWER DOOR LOCKS
NO DOOR LOCKS OPERATE, USING
TRANSMITTER
(1) Measure resistance at keyless entry module
terminal 10. Meter should read zero ohms. If not, re-
pair open to ground.
(2) Measure voltage at keyless entry module termi-
nal 1. Meter should read battery voltage. Battery
voltage must be at least 9 volts for this system to
operate. If not, repair open to #9 fuse.
(3) Jumper test leads keyless entry module termi-
nal 1 to terminal 3. Doors should lock. If OK, replace
Fig. 1 Keyless Entry Transmitter module. If not, repair open from terminal 3 to lock
relay terminal 1.
code received matches the code in the receiver memory
(4) Jumper test leads keyless entry module termi-
circuit, the receiver triggers the door lock/unlock relays. nal 1 to terminal 4. Door should unlock. If OK, re-
The relays complete the circuit to the electric door lock place module. If not, repair open from terminal 4 to
solenoid to either lock or unlock the doors. unlock relay terminal 1.
SYSTEM OPERATION TRANSMITTER SERVICE
To activate the system, aim the transmitter diode If the receiver malfunctions, only the receiver will
toward the receiver and press the transmitter signal have to be replaced. The new receiver will have to be
button to lock or unlock the doors as desired. reprogrammed. If a transmitter is lost, replace the
Effective transmitter range is 4.75 meters (15 ft.) transmitter and reprogram the receiver.
with the transmitter positioned no more than 45 de- Batteries may not be supplied with some re-
grees from the receiver centerline. placement transmitters. Be sure to check a re-
For complete circuit diagrams refer to Group placement transmitter before attempting to
8W - Wiring Diagrams. activate the system.
TRANSMITTER PROGRAMMING TRANSMITTER BATTERY REPLACEMENT
Up to 4 Transmitter Identification Codes (TIC's) can (1) Separate transmitter at middle seam (Fig. 2).
be programed into the receiver at any given time.
(1) Open the driver's door of the vehicle. Leave it
open through the programming procedure.
(2) Move the mechanical door lock lever to the
LOCK position.
(3) Turn the ignition switch to the ON position.
(4) Within 20 seconds, aim a transmitter at the re-
ceiver dome and press the LOCK button for at least
5 seconds. Once the receiver accepts the program-
ming code, the driver's door will unlock.
(5) Once the first transmitter has been pro-
grammed, additional transmitters (up to 4) may be
programmed into the receiver. Within 20 seconds of
the previous transmitter programming, move the me-
chanical door lock lever to the LOCK position. Aim
Fig. 2 Separate Transmitter Halves
8P - 10 POWER DOOR LOCKS J
POWER DOOR LOCKS
J POWER DOOR LOCKS 8P - 11
(2) Remove and discard old batteries (Figs. 3, 4).
Fig. 5 Remove/Install Overhead Console
(5) Disconnect wire harnesses from keyless entry
Fig. 3 Battery Removal
Fig. 6 Remove/Install Overhead Console
Fig. 4 Battery Installation and compass (Figs. 7 and 8).
(3) Install the new CR 1616 batteries. Be sure the
batteries are installed according to polarity as shown
on the transmitter battery receptacles.
(4) Assemble the transmitter and verify the correct
battery installation. The voltage indicator light will
glow when the batteries are properly installed.
RECEIVER SERVICE
WITH OVERHEAD CONSOLE
(1) Remove screw forward of compass unit (Fig. 5).
(2) Flex housing outward while pressing upward to
disengage housing from the rear bracket (arrow 1)
(Fig. 5).
(3) Slide console rearward until the console de-
taches from the front mounting bracket (arrow 2)
(Fig. 5).
(4) While pressing up on rear of console (arrow 1),
slide console forward holding front away from head- Fig. 7 Disconnect Wire Harnesses
liner (arrow 2). Move console forward until the rear (6) Pinch forward area of receiver cover and re-
detaches from headliner and becomes free (Fig. 6). lease clips. Slide cover out from under rib (Fig. 9).
8P - 12 POWER DOOR LOCKS J
Fig. 8 Keyless Entry Harness Connector
Fig. 10 Remove/Install Keyless Entry Housing
DOOR LOCK/UNLOCK RELAY REPLACEMENT
The power door lock/unlock relays are in the relay
center. The relay center is located on the lower in-
strument panel trim cover just right of the steering
column (Fig. 11). Remove both relays.
Fig. 9 Keyless Entry Receiver Cover Removal/
Installation
(7) Remove screw and printed circuit board.
(8) To install the overhead console, reverse the re-
moval procedures. Be sure to flex housing outward
near the keyless entry receiver until the console
snaps onto the rear mounting bracket.
WITHOUT OVERHEAD CONSOLE
(1) Remove 2 screws attaching receiver housing to
headlining (Fig. 10).
(2) Pull housing toward rear of vehicle to disen- Fig. 11 Door Lock/Unlock Relays
gage clip. (1) Remove the appropriate relay from the relay
(3) Disconnect receiver harness connector. center.
(4) Remove circuit board from housing. (2) To install the new relay(s) reverse the removal
(5) Reverse the removal procedures to install the procedure.
receiver.
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