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POWER DOOR LOCKS 8P - 1
POWER DOOR LOCKS
CONTENTS
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page
KEYLESS ENTRY .........................
POWER LOCKS ..........................
POWER LOCKS
INDEX
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Actuator Motor Stall Test ...................
Description .............................
Diagnosing Power Door Locks ...............
General ................................
Liftgate Lock Actuator Replacement ............
Solenoid and Latch Assembly Replacement ......
Switch Replacement—Front Door ..............
Switch Replacement—Rear Door ..............
GENERAL
The door lock actuators, including liftgate, are con-
trolled by two-way switches. To lock the doors, push
either switch to the right. To unlock doors from inside
the vehicle push either switch to the left.
The power door locks do not lock or unlock the
doors from outside the vehicle. Insert the key into the
lock cylinder to lock or unlock each individual door or
use the keyless entry transmitter.
The power door lock operates with battery power
and, therefore, is independent of the ignition switch.
DIAGNOSING POWER DOOR LOCKS
If the vehicle has Keyless Entry and the door locks
operate properly using the door switches but do not
work with the transmitter, refer to Keyless Entry in
this group.
DOOR LOCKS DO NOT OPERATE USING DOOR
LOCK SWITCHES
For complete circuit diagrams refer to Group
8W - Wiring Diagrams.
Check fuses #8 and #14 in the fuse panel. Re-
place as required.
(1) Measure voltage at output side of fuses. Meter
should read battery voltage. If not, repair open in
circuit to fuse.
(2) Remove door switch and measure voltage at
terminal 4. Meter should read battery voltage. If not,
repair open circuit between fuse #8 and switch.
(3) Remove glove box bottom to access the relay
center.
(4) Measure resistance between Lock and Unlock
relay terminal 4 and ground. Meter should read zero
ohms. If not, repair open to ground.
(5) Measure voltage at terminal 2 of both the Lock
and Unlock relays. Meter should read battery voltage.
If OK, next step. If not, repair open to fuse #14.
(6) Measure resistance at terminal 5 of both the
Lock and Unlock relays. Meter should read zero
ohms. If not, repair open to ground.
DESCRIPTION
The door locks are operated by reversible motors.
The voltage supply comes from the 20 amp mini fuse
F1 in the Power Distribution Center (PDC) to the 15
amp #8 fuse located in the fuse panel. Power then
goes to the left hand door lock switch. With the left
hand door lock switch in LOCK, voltage is applied
through the switch to the door Lock Relay coil. The
relay coil is energized which closes the circuit from
the F14 20 amp fuse to the lock motor. Fuse 14 is
supplied by a 40 amp maxi fuse in the PDC labeled
Fuse Block Feed. The motor is grounded by the un-
lock relay.
The LOCK function will not operate if:
²
The chime module is not plugged in.
The key is in the ignition, or the lights are ON,
while the driver’s door is open.
²
The door lock inhibit feature of the chime module
is inoperable due to defective electronics in the chime.
In this case the operation is unpredictable.
The RH door lock window switch operates the same
as the driver’s door switch. The voltage and ground
paths are reversed to unlock the doors.
²
 8P - 2 POWER DOOR LOCKS
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(7) Hold left hand switch in LOCK position. Mea-
sure voltage at lock relay terminal 1. Meter should
read battery voltage. If OK, next step. If not, repair
open to left hand switch.
(8) Hold left hand switch in UNLOCK position.
Measure voltage at Unlock relay terminal 1. Meter
should read battery voltage. If OK, next step. If not,
repair open to left hand switch.
(9) Hold left hand switch in LOCK position. Mea-
sure voltage at Lock relay terminal 4. Meter should
read battery voltage. If OK, next step. If not, replace
Lock relay.
(10) Hold left hand switch in UNLOCK position.
Measure voltage at Unlock relay terminal 4. Meter
should read battery voltage. If OK, check connections
and door motor. If not, replace Unlock relay.
(11) Repeat procedures for RH switch.
Fig. 2 Door Panel Removal
(6) Remove the trim panel with a wide flat blade
tool (Fig. 3).
To aid in removal of the trim panel, start at
the bottom of the panel.
Fig. 1 Door Lock/Unlock Relays
ACTUATOR MOTOR STALL TEST
To test the actuator motor, attach 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
Removal procedures.
Fig. 3 Trim Panel Removal
(7) Unplug electrical connector from switch.
(8) Remove switch from door panel.
(9) Install a new switch.
(10) Install door trim panel by reversing the re-
moval procedures.
SWITCH REPLACEMENT—FRONT DOOR
(1) Remove screw at top of trim panel near mirror
(Fig. 2).
(2) Remove screw from demister opening at front of
door.
(3) Remove screw and door handle cover.
(4) Remove screw from under armrest.
(5) Remove screw from bottom of hand hold in arm-
rest.
SWITCH REPLACEMENT—REAR DOOR
(1) Remove screw and door handle cover (Fig. 4).
(2) Remove screw from under armrest.
(3) Remove screw from bottom of hand hold in arm-
rest.
CAUTION: The wiring harness to the door switches
is just long enough to allow installation. If trim panel
is pulled off by hand the switch may be pulled apart.
Use a door clip tool to prevent damaging the
switches.
CAUTION: The wiring harness to the door switches
is just long enough to allow installation. If trim panel
is pulled off by hand the switch may be pulled apart.
Use a door clip tool to prevent damaging the
switches.
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POWER DOOR LOCKS 8P - 3
Fig. 4 Trim Panel Attachment
Fig. 6 Window Track Attaching Bolts—Rear Door
(4) Remove the trim panel with a wide flat blade
tool (Fig. 3).
To aid in removal of the trim panel, start at
the bottom of the panel.
(5) Remove switch from door panel.
(6) Install a new switch.
(7) Install door trim panel by reversing the removal
procedures.
SOLENOID AND LATCH ASSEMBLY REPLACEMENT
(1) Remove door panel as described in Switch Re-
placement.
(2) Remove 1 bolt holding bottom of window track
to door (Figs. 5 and 6).
Fig. 7 Power Lock Motor—Front Door
Fig. 5 Window Track Attaching Bolts—Front Door
(7) Attach the lock solenoid to the door panel with
3 torx head screws. Tighten screws to 11 N
lbs.).
(8) Install 4 linkage rods.
(9) Using 3M 08044 or 3M 08041 adhesive/sealant,
install the plastic water dam sheet.
(10) Place the trim panel in the installation posi-
tion and press in the nylon retainers.
(11) Install the door panel attaching screws.
(3) Disconnect 4 linkage rods from their clips (Figs.
7 and 8).
(4) Unplug wire harness connector from lock motor.
(5) Remove 3 torx head screws retaining the latch
(Figs. 9 and 10).
(6) Place the lock solenoid, latch and remote control
rods in the door.
I
m (95 in.
 8P - 4 POWER DOOR LOCKS
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Fig. 10 Latch Removal/Installation—Rear Door
Fig. 8 Power Lock Motor—Rear Door
Fig. 11 Liftgate Trim Panel Removal
Fig. 9 Latch Removal/Installation—Front Door
LIFTGATE LOCK ACTUATOR REPLACEMENT
(1) Remove 5 screws holding liftgate interior trim
panel.
To aid in removal of the trim panel, start at
the bottom of the panel.
(2) Remove the trim panel with a wide flat blade
tool (Fig. 11).
(3) Disconnect the lock actuator linkage clip at the
handle (Fig. 12).
(4) Remove 2 actuator retaining screws (Fig. 13).
(5) Remove the actuator.
Fig. 12 Lock Actuator Linkage Clip
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POWER DOOR LOCKS 8P - 5
(7) Tighten the actuator screws to 3 N
I
m (28 in.
lbs.) torque.
Fig. 13 Power Lock Actuator Removal/Installation
(6) To install the actuator, reverse the removal pro-
cedures.
KEYLESS ENTRY
INDEX
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page
Diagnosing Power Door Locks ...............
Door Lock/Unlock Relay Replacement ..........
Receiver ...............................
Receiver Service .........................
System Description .......................
System Operation ........................
Transmitter .............................
Transmitter Programming ....................
Transmitter Service .......................
SYSTEM DESCRIPTION
The keyless entry system consists of a portable
remote control transmitter and a receiver mounted in
the overhead console or in the dome-lamp housing.
System operation is based on a coded infrared signal
from the transmitter to the receiver. The transmitter
is programmed into the receiver providing the correct
programming sequence is met.
When the keyless entry system is activated, the
corresponding relay operates to supply voltage to the
motors. The use of either relay determines the polar-
ity of the voltage that is supplied to the door lock
motors.
When the keyless entry system is used, the trans-
mitter sends a signal to the keyless entry module. If
the doors are unlocked, the module activates a tran-
sistor switch to apply voltage to the lock relay coil.
The coil is energized to close the normally open con-
tacts of the lock relay. Battery voltage from the relay
is applied to the door lock motors to lock the doors.
Current flows in the same path to ground as it does
when the master door lock switch is used.
When the doors are locked, the keyless entry mod-
ule applies voltage to the unlock relay coil and a
similar action takes place to unlock the doors.
TRANSMITTER
The pocket size, solid state transmitter operates on
2, 3 volt lithium (CR1616) batteries (Fig. 1). The
transmitter is activated by pressing either the lock
Fig. 1 Keyless Entry Transmitter
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