1993 CHEVROLET PLYMOUTH ACCLAIM ECU

(1) Be sure that the module has a battery feed
from the 20 Amp breaker in cavity 1 of the black
connector. Also affected would be the optical horn
and the stop lamps. (2) Be sure that the module has an ignition feed
from 5 Amp fuse in cavity 8 of the black connector.
Also affected would be the body computer, instru-
ment cluster and message center. (3) Be sure that the module has a ground from the
right side cowl behind the body computer to the cav-
ity 5 of the black connector. (4) Be sure that you are supplying a good ground
to the programming wire. (5) If the above circuits are good, replace the Re-
ceiver Module. CONDITION: Doors can be locked or unlocked with
the Keyless Entry transmitter. But the doors will not
lock. The Vehicle Theft Alarm system will not arm,
when using only the power door LOCK switch in the
driver's door. (1) Be sure you have not left key in the ignition
column lock cylinder. (2) If step 1 is OK, check the Key in Lock switch
circuit in the steering column for a short to ground. (3) In this problem the body computer controls the
LOCK function. Be sure that it is providing a battery
voltage output to the door lock relay. The door lock
relay controls the door lock motors. CONDITION: Doors will lock but Vehicle Theft
System will not arm when using the transmitter. (1) The Keyless Entry Receiver Module controls
the door lock signal to the door lock relay. The door
lock relay controls the door lock motors. Check for
battery voltage at cavity 10 of the Theft Alarm mod-
ule from the Receiver module. (2) If voltage is OK, replace Receiver module.
CONDITION: All doors except driver's door will
lock with the transmitter. (1) Test the driver's door output of the Receiver
Module for a ground. (2) If there is no ground at the pin, replace the Re-
ceiver module. (3) If there is a ground at the output, replace the
door lock motor. CONDITION: Only driver's door will lock with the
transmitter.
² Repair ground circuit to unlock relay
² Replace unlock relay
CONDITION: Doors do not lock with the transmit-
ter, but still get horn CHIRP that indicates that they
did lock. Replace Receiver module. CONDITION: Doors will lock with the transmitter
but there is no horn CHIRP. (1) Press horn button, listen horn sound.
(2) If the horn sounded, change horn relay. (3) Still no CHIRP, check continuity between the
horn relay and the receiver output pin. Repair as
necessary. (4) Still no horn CHIRP, replace the receiver mod-
ule. (5) If using a DRB II, refer to Body Diagnostic Pro-
cedures.
REMOTE KEYLESS MODULE REPLACEMENT
(1) Remove lower right instrument panel silencer.
(2) Remove glove box assembly.
(3) Remove three screws attaching the mounting
bracket to instrument panel. (4) Lower bracket and module assembly, to discon-
nect wire connector. (5) Remove two screws attaching the Remote Key-
less entry Module to bracket. (6) Remove two screws attaching the security mod-
ule to bracket. (7) To installation reverse above procedures.
LAMP OUTAGE MODULE REPLACEMENT
(1) Remove lower right instrument panel silencer.
(2) Remove glove box and ash receiver module.
(3) Remove three screws attaching the mounting
bracket to instrument panel. (4) Lower bracket and module assembly, to discon-
nect wire connectors. (5) Remove two screws attaching the Lamp Outage
Module to bracket. (6) Remove two screws attaching the security mod-
ule to bracket. (7) To installation reverse above procedures.
DOOR LOCK INHIBIT
The power door lock inhibit system prevents the
doors from being locked using the power door locks
when either of two conditions occur: (1) The key is in the ignition switch and any of the
doors are open. The ignition switch does not have to
be ON. (2) The key is in the ignition switch and the head-
lamp are on.
AC, AG, AJ AND AY BODIES
With the ignition switch in the ON or OFF position
and the driver's door open the Body Controller will
ignore the command to lock the power door locks.
Once the key is removed, or the driver's door is
closed, the Body Controller will allow the power door
locks to lock. Refer to Body Diagnostic Procedure
Manual for further testing procedures.
8P - 6 POWER LOCKS Ä

VEHICLE THEFT SECURITY SYSTEM
CONTENTS
page page
GENERAL INFORMATION .................. 1
SECURITY SYSTEM DOOR SWITCH REPLACEMENT ........................ 2
SECURITY SYSTEM HOOD SWITCH REPLACEMENT ........................ 2 SYSTEM SELF-TESTS
.................... 1
VEHICLE THEFT SECURITY SYSTEM MODULE REPLACEMENT ........................ 2
WHAT WILL TRIGGER THE SYSTEM ........ 1
GENERAL INFORMATION
JUMP-STARTING, VEHICLE EQUIPPED
WITH THEFT SECURITY SYSTEM . After the
booster battery has been connected, the Theft System
must be turned OFF. Using the key, lock then un-
lock either front door. This turns the Theft System
OFF and the remainder of the Jump-Starting proce-
dure can be followed. If this procedure is not followed, the Theft System
electronics will prevent the engine from starting. If a new Powertrain Control Module is installed,
the engine has to be cranked 20 times before the
alarm system activated. This passive system is designed to protect against
whole vehicle theft. The system monitors vehicle
doors, hood, trunk key cylinder, and ignition action
for unauthorized operation. The alarm activates by
sounding the horn, flashing the park and tail lamps,
and providing an engine kill feature (Fig. 1). Passive arming occurs upon normal vehicle exit,
open door, lock with power locks, close door. The SET
lamp in the panel will flash for 15 seconds, indicat-
ing that arming is in progress. If no monitored sys-
tems are activated during this period, the system
will arm. If the hood or trunk key cylinder switches
are not sensed by the system. The SET lamp will re-
main lit during the arming process, although the sys-
tem will still arm. The system is to be considered as
an active armed system when using the Remote Key-
less Entry. If the SET lamp does not illuminate at all
upon door closing it indicates that the system is not
arming. Passive disarming occurs upon normal vehicle en-
try unlocking either door with the key, or unlocking
using the Remote Keyless transmitter. This disarm-
ing will also halt the alarm once it has been acti-
vated. Whenever the battery is disconnected and recon-
nected, the Vehicle Theft Security System enters
power up alarm mode which flashes the park and tail
lamps and prevents the engine from running. To exit
this mode, the system must be disarmed as men-
tioned above. A tamper alert exists to notify the driver that the
alarm had been activated, and the alarm has since
timed-out for more than 18 minutes. This alert con-
sists of 3 horn pulses when the vehicle is disarmed. The alarm system will not arm if the doors are
manually locked, providing a manual override of the
alarm.
WHAT WILL TRIGGER THE SYSTEM
One of the following actions will trigger the system
while it is armed. Without properly disarming sys-
tem, by using the key or the remote transmitter. (1) Opening the HOOD.
(2) Opening any DOOR.
(3) Removing the TRUNK KEY CYLINDER.
(4) Turning the IGNITION ON.
(5) The ignition switch can be turned to the acces-
sory position without triggering alarm system.
SYSTEM SELF-TESTS
A diagnostics mode is available in the system to
verify operation of all monitored switches or circuits.
To enter diagnostics, cycle the ignition key to the ac-
cessory position 3 times, leaving the key in this po-
sition. Upon entering diagnostics, the park and tail lamps
will begin flashing to verify their operation. In addi-
tion, the horn will sound twice to indicate that the
trunk key cylinder is in its proper position. Return-
ing the ignition to the OFF position will stop the
lamps from flashing while keeping the system in di-
agnostics. While in diagnostics mode, a horn pulse should oc-
cur at each of the following events indicating proper
operation: (1) Beginning with all doors closed, open then close
each door. The horn will sound when the door ajar
switch closes, and then again when the switch opens.
There must b e a 1 second delay between closing and
opening the switch. (2) Open, then close the hood. The horn will sound
when the hood is opened, and again when it is closed.
Ä VEHICLE THEFT SECURITY SYSTEM 8Q - 1

(3) Activate the power door locks in both the
LOCK and UNLOCK directions. The horn will sound
after each activation. (4) Rotate the key in each of the door lock cylin-
ders to the unlock position. The horn will sound as
the switch closes, and again when it opens. There
must b e a 1 second delay between changing switch
states, or the horn will not sound.
² Press the LOCK button,horn will sound.
² Press the UNLOCK button, horn will sound.
(5) Cycle the key to the ignition RUN position. A
single horn pulse will indicate proper operation of
the ignition input. This will also take the module out
of the diagnostics mode. For any of these tests, if the
switch does not remain open or closed for at least 1
second, the horn will only sound once. The lack of a horn pulse, during any operation, in-
dicates a switch failure. Check for continuity at the
switch, if this is good, check for an open or shorted
wire between the switch and alarm module. Also,
check if a new powertrain control module has been
installed recently. Vehicle Theft Security System will
not function until 20 engine cranks. Whenever a Vehicle Theft Security System mal-
function occurs, first verify that the wire harness is
properly connected to all connectors before starting
normal diagnosis and repair procedures. Refer to Ve-
hicle Theft Security System Diagnosis Chart (Fig. 3).VEHICLE THEFT SECURITY SYSTEM MODULE
REPLACEMENT
If the Vehicle Theft Security System module is be-
ing removed and no replacement module is being in-
stalled, the module wiring must be disconnected
while the engine is running. Failure to do so will
cause a no-start condition (Fig. 3 and 4). (1) Remove lower right instrument panel silencer.
(2) Remove glove box assembly.
(3) Remove three attaching screws mounting the
bracket to instrument panel. (4) Lower bracket and module assembly, to discon-
nect wire connectors. (5) Remove the Remote keyless module so to have
access to the Security Module two screws attaching
module to bracket. (6) For installation reverse above procedures.
SECURITY SYSTEM HOOD SWITCH REPLACEMENT
(1) Remove screw from left inner fender (Fig. 5).
(2) Disconnect wiring.
(3) Remove switch.
(4) For installation reverse above procedures.
SECURITY SYSTEM DOOR SWITCH REPLACEMENT
(1) Remove door trim panel and water shield. Re-
fer to Group 23, Body.
Fig. 1 Vehicle Theft Security System Components
8Q - 2 VEHICLE THEFT SECURITY SYSTEM Ä

Fig. 2 Vehicle Theft Security System Diagnosis
Ä VEHICLE THEFT SECURITY SYSTEM 8Q - 3

(2) Remove illuminated entry switch wiring clip
(Fig. 6). (3) Remove disarming switch from door handle.
(4) For installation reverse above procedures.
Fig. 3 Vehicle Theft Security System ModuleÐAC and AY Bodies
Fig. 4 Vehicle Theft Security System ModuleÐAG and AJ Bodies
Fig. 5 Hood Switch
Fig. 6 Door Switch (Typical)
8Q - 4 VEHICLE THEFT SECURITY SYSTEM Ä

(7) If battery is good, check for continuity of driv-
er's power seat switch. Refer to Power Memory Seat
Switch Continuity (Fig. 16). (8) Check that all connectors are securely plugged
into control module under driver's seat with no ter-
minal push outs. (9) No correctable faults are found in the above
steps. The battery voltage and ground circuits are
good into the control module. There is battery volt-
age through the seat switch to the control module.
Then replace the control module. (10) If the control module must be replaced, open it
and observe the non-relay side of the printed circuit
board. The module may be damaged by an intermit-
tent short on the inside of the recliner switch. If a
trace is burnt open near the 10-way connector, may
be caused by the recliner switch (Fig. 18).
(11) If module is burnt, remove recliner switch.
Open the switch and observe the movable contacts
staking at the staked end. If the contact, arm can be
rotated, by a sideways motion, the switch must be re-
placed. This will prevent the new control module
from damaged by the switch.
CONDITION: NO RECLINER MOTION FORWARD OR REARWARD AND NO RELAYSCAN BE HEARD CLICKING WHEN THERECLINER SWITCH IS ACTIVATED.
PROCEDURE
(1) Check for battery voltage at pin 11 of the con-
trol module 21-way connector. (2) Check for battery voltage at pin 3 of the re-
cliner switch connector. (3) Check for ground at pin 1 of the control module
21-way connector. (4) Check for ground at both pins 1 and 5 of re-
cliner switch connector. If ground is missing at only
one of these pins, repair or replace the seat wiring
harness. (5) If battery voltage and ground are correct to the
recliner switch connector, check continuity of the re-
cliner switch. Refer to Left Power Memory Recliner
Switch Continuity (Fig. 19).
CONDITION: NO RECLINER MOTION FORWARD, AND A RELAY CAN BE HEARDCLICKING WHEN THE RECLINER SWITCH ISACTIVATED.
PROCEDURE
(1) Check for battery voltage at pin 2 of the control
module 10-way connector with the recliner switch ac-
tivated. (2) Check for ground at pin 4 of the control module
10-way connector with the recliner switch activated. (3) If battery voltage and ground are NOT present
at the above pins of the 10-way connector, replace
the control module. If battery and ground are
present, then continue procedure. (4) Check for battery voltage and ground at re-
cliner motor connector in seat. (5) If recliner motor will not operate, refer to Ser-
vice Procedure for Recliner Motor and Cable.
CONDITION: NO RECLINER MOTION REARWARD, AND RELAYS CAN BE HEARDCLICKING WHEN THE RECLINER SWITCH ISACTIVATED.
PROCEDURE
(1) Check for ground at pin 2 of the control module
10-way connector with the recliner switch activated.
Fig. 18 Memory Module Burnt Area
Fig. 19 Memory Recliner Switch Continuity
8R - 10 POWER SEATS Ä

ity 9 and pin 7 of the control module 25-way connec-
tor. The vehicle speed sensor signal can be tested
with a volt/ohmmeter at pin 7 of the control module
25-way connector. Turn on the vehicle ignition and
check fo r a 5 volt signal as the vehicle is moved
about 3 to 5 feet. If not repair open wiring, terminal
push out, bad crimp, drive in vehicle speed sensor,
etc., as necessary to correct condition. Ensure that
the 25-way connector is plugged into the control
module securely. Road test vehicle after repairs have
been made to ensure that no recalls can occur while
moving.
CONDITION: INSTRUMENT CLUSTER SPEEDOMETER STAYS AT 0 MPH/ (0 KM/H)WHILE VEHICLE IS MOVING, BODYCOMPUTER DOES NOT LOCK DOORS AT 15MPH (24 KM/H), AND THE SPEED CONTROLWILL NOT ACCEPT A SPEED SET.
PROCEDURE
(1) Remove driver's seat anchor bolts and nuts. Ad-
just the driver's seat to a safe driving position. Dis-
connect the 25-way connector from the memory seat
control module. Replace the driver's seat anchor bolts
and nuts. Road test the vehicle to complete this diag-
nosis. If the doors lock, the cruise control accepts a
set, and the speedometer now works, replace the
Memory Seat control module. (2) After replacing the Memory Seat control mod-
ule, perform the memory seat diagnostic self tests.
This teaches the new module it's soft limits and now
re-road test the vehicle before returning it to the cus-
tomer.
CONDITION: NO SEAT MOVEMENT IN THE RECALL MODE, SEAT WILL MOVE BYMANUAL SWITCH ACTUATION IN ALLDIRECTIONS WITHOUT STALL DETECTION.
PROCEDURE
(1) Check for 5 volts at pin 10 of the control mod-
ule 25-way connector. This is the 5 volt feed from the
control module to the seat track position sensing po-
tentiometer. (2) Check for ground at pin 8 of the control module
25-way connector. To test for ground, one lead of the
voltmeter must be connected to either the 5 volt sup-
ply for the control module or the battery positive. If
the sense voltage and ground are NOT present at the
above pins of the 21-way control module connector.
When the seat switch is pressed, replace the control
module. An inadvertent application of battery volt-
age to the circuit could damaged the control module.
If the voltage and ground circuits are present then
continue this procedure. (3) Check for 5 volts at pin 5 of the natural 5-way
connector plugged into the power seat adjuster mo-
tors end-bell. (4) Check for ground at pin 4 of the natural 5-way
connector plugged into the power seat adjuster mo-
tors end-bell. If the power seat adjuster still has no
movement in the recall mode, then continue this pro-
cedure. (5) Disconnect the natural 5-way connector from
the power seat adjuster motors end-bell. (6) Check with an ohmmeter for a resistance read-
ing that may be from 2600 to 4000 ohms between
pins 4 and 5 of the motors end-bell connector. If
there is an open circuit reading or the reading ob-
tained falls outside this range, then replace the seat
motor package assembly. After replacement of the
seat motor package, reconnect all wiring connectors
and reinstall seat assembly in vehicle. Operate the
switches manually to cause maximum seat move-
ment in all directions. Perform the memory seat di-
agnostic self check so the control module will learn
the new soft limits of the assembly.
CONDITION: NO SEAT TRACK FORWARD OR REARWARD MOVEMENT IN THE RECALLMODE, SEAT TRACK WILL MOVE FORWARDOR REARWARD BY MANUAL SWITCHACTUATION WITHOUT STALL DETECTION.
PROCEDURE
(1) Check for a voltage at pin 12 of the control
module 21-way connector. Less than 5 volts for the
seat track fully forward and more than 0 volts when
fully rearward. This voltage should vary correspond-
ing to the position. (2) Check for a voltage at pin 1 of the natural
5-way connector, Same as in step (1) above. The
ground lead connected to pin 4 of the 5-way connec-
tor. If the voltage reading is at 0 volts, disconnect
the 5-way natural connector and check for a short to
ground in the harness. If no short is found, reconnect
the connector and continue the procedure. (3) Check for the voltage to vary as noted above, if
it does not vary as the seat track is moved forward
and rearward, the sensing potentiometer is defective.
Replace the seat motor package assembly. After re-
placement of the seat motor package, reconnect all
wiring connectors and reinstall seat assembly in ve-
hicle. Operate the switches manually to cause maxi-
mum seat movement in all directions. Perform the
memory seat diagnostic self check so the control
module will learn the new soft limits of the assem-
bly.
Ä POWER SEATS 8R - 13

(9) Remove recliner motor and cable assembly.
INSTALLATION
(1) Position recliner motor and cable assembly to
seat track. Check that the cable is equipped with a
cable housing clip and clamp. (2) Connect wiring connectors.
(3) Install power recliner motor to power seat track
front cross strap with two attaching screws (Fig. 30). (4) Align power seat track with the cushion frame.
The power recliner cable housing must be routed to-
ward the recliner through the gap between the cush-
ion frame and the power seat track side strap. (5) Install the power seat track to the cushion
frame. (6) Install the square drive cable end into the
square hole in the drive worm gear at transmission.
The cable may have to be rotated manually in order
to align properly with the square hole in the drive
worm gear. (7) Position cable housing so that it is properly
seated into the transmission housing. (8) Clamp the cable housing to the transmission
housing with the clamp. The prongs of the clamp
should be pointing towards the floor of the vehicle. (9) Install cable housing clip into the hole located
in the cushion frame. (10) Install the seat outboard side shield. (11) Install the seat assembly into the vehicle fol-
lowing the procedure outlined under Seat Assembly
Installation.
POWER RECLINER MECHANISM
REMOVAL
(1) Remove seat outboard side shields (Fig. 30).
(2) Remove four recliner attaching screws. Some
vehicles require the trim to be lifted in order to ex-
pose recliner screws at the seat back attachment. (3) Disconnect cable housing clamp at transmis-
sion. (4) Remove cable from transmission drive worm
gear. Be careful not to allow the cable to be pulled
out of the housing. This will prevent possibility of
disconnecting the cable from the motor at the other
end.
INSTALLATION
(1) Install the square drive cable end into the
square hole in the drive worm gear at recliner mech-
anism. The cable may have to be rotated manually in
order to align properly with the square hole in the
drive worm gear. (2) Position the cable housing so that it is securely
seated into the transmission housing. (3) Clamp the cable housing to the transmission
housing with clamp. The prongs of the clamp should
Fig. 30 Power Memory Seat
8R - 18 POWER SEATS Ä