1993 CHEVROLET PLYMOUTH ACCLAIM mirror

SYSTEM SOFT LIMITS
This portion of the system becomes activated when
the control module must shut off a specific seat, re-
cliner or mirror motor because it has reached the end
of its travel. When a mechanical stall condition is de-
tected, the control module will set a soft limit in its
memory and will not allow the motor to be driven
past that point. To override the soft limits, activate the seat or re-
cliner switch twice in the desired direction holding
the switch activated until the end of travel has been
reached. Reactivate and hold the switch once more
for three seconds. This will cause new soft limits to
be set in the control module.
SETTING SYSTEM SOFT LIMITS
If the control module or motor assemblies have
been replaced, the control module must learn its new
soft limits. To do this, perform the memory seat di-
agnostic self-test. After the tests are completed, the
control module will have learned and memorized its
new soft limits.
TEST PROCEDURES
Before any testing is attempted, the battery should
be carefully charged and all connections and termi-
nals cleaned and tightened to insure proper continu-
ity and grounds.
MEMORY SEAT AND MIRROR DIAGNOSTIC
SELF-TESTS
The system has a built-in set of three self-tests
which check all components in the system while giv-
ing a visual feedback. To enter the first self-test mode, switch test, press
memory position 1 and 2 buttons, hold for at least
five seconds and no longer than ten seconds. Follow
this immediately by pressing the Set button and hold
for at least five seconds but less than ten seconds.
Three seconds after the button is released, the seat,
recliner and mirrors will move to a mid-travel posi-
tion. Within ten seconds, press and release a seat
button to activate a seat or recliner motor. All
switches except the mirror switches may now be
tested one at a time. The memory switches, Position
1 and 2 and Set buttons, may also be tested. A good
switch contact actuation will NOD the seat. The seat
nod consists of seat front up and seat track forward
followed by seat front down and seat track rearward.
The nod also includes both outside power rear view
mirrors operating in the vertical plane. The system
will continue NODDING for good switches until 10
seconds pass without any switch actuation. Within 10 seconds of the last seat nod, press mem-
ory position 1 and 2 buttons for at least 5 seconds
Fig. 9 Seat AdjusterÐAA Body
8R - 6 POWER SEATS Ä

but less than 10 seconds, and then release. The seat
will move, after 3 seconds, to a full down and rear-
ward position. This is the seat check mode. The control module
will now move the motors to a stall in forward, rear-
ward, front up, front down, rear up, rear down, re-
cliner forward, and recliner rear ward positions. If a
problem exists, the control module will not move that
part of the seat. After all motors have been run to
stall, the system will pause for 3 seconds, then re-
turn to the mid-travel position. The control module will now move the seat through
its positions for two seconds run time. If a problem has been found, the control module
will go into a loop and just move the problem part of
the system. To exit the loop, press the Set or Position
1 or 2 buttons or repair the fault; i.e.: repair a ter-
minal push out, etc. When the seat movements are complete, the sys-
tem will return to its normal operating mode unless
memory Position 1 and 2 buttons are held for at least
five seconds, but less than ten seconds and then re-
leased. The seat will return to its mid-travel position
and the mirrors will move full downward and to the
left. This is the mirror check mode. The control mod-
ule will then move the right mirror fully horizontal
outboard, and horizontal inboard. This is followed by
the left mirror fully horizontal inboard, horizontal
out board, vertical up, and vertical down. Each motor
will be driven until the associated mirror plane face
has been stalled for up to 1-1/2 seconds at each end
of travel. If the control module encounters a problem
with any position sensing rheostat that is connected
to each motor, that particular motor will not be ac-
tuated. After an other three second pause, the control
module will again try running the mirror motors in
the directions given above plus the right mirror ver-
tical up and vertical down. Any motor that has no
problem will run for two seconds in each of the given
directions. If a problem is found, the control module will go
into a loop and move only the problem part of the
system. To exit the loop, repair the fault, or press the
Set, Position 1 or 2 buttons. The control module will
then finish the motor actuation that are shown
Fig. 13 Seat Wing Switch Continuity
Fig. 14 Lumbar Switch Continuity
Fig. 15 Memory Seat Switch
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above. When the control module has finished, it will
return to the normal operating mode after ten sec-
onds if no further switches are activated.The control module will also return to normal op-
erating mode if any manual seat or recliner move-
ment switch is actuated during the ten second
timeout. If the system has found a problem, refer to the ap-
propriate diagnosis condition.
POWER MEMORY SEAT, RECLINER AND
MIRRORS DIAGNOSIS
Before any diagnosis is done on the system, move
the seat switches and listen for relays clicking in the
control module under the seat. If relays can be heard,
the main battery and ground circuits to the control
module as well as the battery circuit to the switches
in the driver's door are good. When checking for voltage or continuity, always
use a volt/ohm meter to get accurate readings. The
seat and recliner switches must be activated to check
for voltage at the seat and recliner motors or at the
input to the control module from the switches. The control module creates a special voltage supply
for the position sensing functions. It also shuts down
after five seconds, in order to check this or any other
voltage being fed back to the control module. A
switch may have to be activated more than once to
verify a voltage reading. The voltage from the con-
trol module that feeds the seat and recliner position
sensing potentiometer, will be between 4.5 to 5 volts.
For simplicity in the diagnosis section, the feed volt-
age will be called 5 volts. On the position sensing
wires, these voltages will always be less than 5 volts
but more than 0 volts. Typically the high level is at
a maximum of about 4.25 volts and the low level can
be as little as 0.1 volts. If any seat or recliner potentiometer or mirror
rheostat position sense wires are crossed, the control
module will not move that part of the system. The
seat or mirror will be in a fault diagnostic mode.
CONDITION: SYSTEM WILL NOT OPERATE.
PROCEDURE
(1) Check for forward/rearward operation of re-
cliner. If not operable, check for an open or loose cir-
cuit breaker mounted in board on the relay bank in
cavity 15. (2) Check for continuity between 2-way connector
under driver's seat and pin 1 at control module 10-
way connector (Fig. 16 and 17). (3) Check for continuity between 2-way connector
under driver's seat and pin 6 at control module 10-
way connector. (4) Check for any movement of the seat by operat-
ing the seat switch.If movement the circuit is good
into the control module. (5) No movement check for an open or loose fuse in
cavity 15 of the fuse block. (6) Check for battery voltage to pin 3 of driver's
power seat switch.
Fig. 16 Memory Seat Switch Continuity
Fig. 17 Memory Seat Module Connectors
Ä POWER SEATS 8R - 9

(2) Check for battery voltage at pin 4 of the control
module 10-way connector with the recliner switch ac-
tivated. (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 MANUAL MOVEMENT FORWARD OR REARWARD,RECLINER MOVES IN RECALL MODE ONLY.
PROCEDURE
(1) Check wiring harness in seat between control
module and recliner switch for shorted wires to
ground or crossed wires. If the ground pins 1 and 5
are in the wrong cavities of the recliner switch con-
nector, the control module may be damaged. Deter-
mine the cause and replace the control module after
repairing the wiring if necessary. (2) The recliner moves forward in the recall mode
only. Press the recliner switch in the forward direc-
tion and check for battery voltage at pin 2 of the re-
cliner switch connector and at pin 5 of the 21-way
control module connector. (3) The recliner moves rearward in the recall mode
only. Press the recliner switch in the rearward direc-
tion and check for battery voltage at pin 4 of the re-
cliner switch connector and at pin 6 of the 21-way
control module connector.
CONDITION: NO RECLINER MOVEMENT IN THE RECALL MODE, RECLINER WILL MOVEMANUALLY WITHOUT STALL DETECTION.
PROCEDURE
(1) Check for 5 volts at pin 9 of the control module
21-way connector (This is the 5 volt feed from the
control module to the recliner position sensing resis-
tor. (2) Check for ground at pin 7 of the 21-way control
module connector. To test for ground, one lead of the
voltmeter must be connected to the 5 volt supply for
the control module. If the sense voltage and ground
are NOT present, at the above pins of the 21-way
control module connector when the recliner switch is
pressed. Replace the control module since an in ad-
vertent application of battery voltage to the circuit
could damaged the control module. If the circuits are
present then continue this procedure. (3) Check for 5 volts at pin 2 of the black 5-way
connector plugged into the recliner motor end-bell. (4) Check for ground at pin 4 of the black 5-way
connector plugged into the recliner motor end-bell. (5) Unplug the black 5-way connector and observe
the male pins for deformation. If deformed, carefully
straighten to mate properly with the connector. Care-
fully reconnect 5-way connector. (6) Check for a voltage at pin 3 of the black 5-way
connector plugged into the recliner motor end-bell
with the recliner switch activated. Less than 5 volts
when fully forward and more than 0 volts when fully
reclined that is variable when the recliner is moving.
This is the position sense voltage the control module
must have or it will not move the recliner in recall
since it has no reference for movement. To test for
this voltage, one lead of the voltmeter must be con-
nected to either pin 4 of the black 5-way connector or
pin 7 of the 21-way connector. If the above steps
have been followed and the voltage is 0, check for a
seat wiring harness short to ground of this circuit,
repair as necessary, before continuing with this pro-
cedure. (7) Check for the position sense voltage at pin 3 of
the control module 21-way connector. If the voltage
appears correct, and varies as indicated in step (6)
above and there is continuity back to the 5-way con-
nector, then replace the control module.
CONDITION: NO SEAT OR RECLINER MOVEMENT FROM THE MANUAL SWITCHES.SEAT AND RECLINER WILL MOVE IN THERECALL MODE ONLY.
PROCEDURE
(1) Check for a stuck switch contact in the recliner
switch mounted in the driver's left seat side shield.
Refer to the Memory Recliner Switch Continuity
(Fig. 19). (2) Check for a stuck switch contact in the driver's
power seat switch. Refer to Memory Seat Switch
Continuity (Fig. 16).
CONDITION: NO MEMORY RECALL OF SEAT, RECLINER, OR MIRRORS. SEAT, RECLINER,AND MIRRORS WILL MOVE BY MANUALSWITCH ACTUATION ONLY.
PROCEDURE
(1) Check for a stuck switch contact in the memory
switch. Refer to the Memory Switch Continuity (Fig.
20). (2) Check for battery voltage pin 1 of the memory
switch (Fig. 20).
Ä POWER SEATS 8R - 11

CONDITION: NO MEMORY RECALL OF SEAT, RECLINER, OR MIRRORS TO POSITION 1ONLY. UNABLE TO ENTER DIAGNOSTIC SELFTEST MODES. POSITION 2 RECALL WORKS.
PROCEDURE
(1) Check for continuity of actuated memory posi-
tion 1 switch. Refer to the Memory Switch Continu-
ity (Fig. 19). If there is continuity, continue with
procedure. If not replace switch. (2) Check for a terminal push out at pin 2 of the
memory switch connector. (3) Check for battery voltage at pin 14 of the con-
trol module 25-way connector with position 1 switch
actuated. If battery voltage is OK. There is no termi-
nal push out, and the connector is properly seated.
But no reaction from the control module, manually
move the seat to a different position than 2. To in-
sure that the Position 1 is not simply a duplicate of
Position 2. If there is still no reaction of the control
module to the actuation of the Position 1 button,
then replace the control module.
CONDITION: NO MEMORY RECALL OF SEAT, RECLINER, OR MIRRORS TO POSITION 2ONLY. UNABLE TO ENTER DIAGNOSTIC SELFTEST MODES. POSITION 1 RECALL WORKS.
PROCEDURE
(1) Check for continuity of actuated memory Posi-
tion 2 button. Refer to the Memory Switch Continu-
ity (Fig. 20). If there is continuity, continue with
procedure. If not replace switch. (2) Check for a terminal push out at pin 3 of the
memory switch connector. (3) Check for battery voltage at pin 1 of the control
module 25-way connector with Position 2 button ac-
tuated. If battery voltage OK. There is no terminal
push out, and the connector is properly seated. But
no reaction from the control module, manually move
the seat to a different position than 1. To insure that
the position 2 is not simply a duplicate of position 1.
If there is still no reaction of the control module to
the actuation of the 2 switch, then replace the con-
trol module.
CONDITION: ACTUATION OF THE SET BUTTON WILL NOT SET ANY NEW POSITIONSIN MEMORY. UNABLE TO ENTERDIAGNOSTIC SELF TEST MODES. ONLYPREVIOUSLY SET MEMORY POSITIONS CANBE RECALLED.
PROCEDURE
(1) Check for continuity of actuated memory
switch Set button. Refer to the Memory Switch Con-
tinuity (Fig. 20). If there is continuity, continue with
procedure. If not replace switch. (2) Check for a terminal push out at pin 4 of the
memory switch connector. (3) Check for battery voltage at pin 2 of the control
module 25-way connector with the Set button actu-
ated. If battery voltage is OK, there is no terminal
push out, and the connector is properly seated then
replace the control module.
CONDITION: NO MEMORY POSITIONS CAN BE RECALLED AND THE MEMORY SEATDIAGNOSTIC SELF SWITCH CHECK IS THEONLY PART OF SELF TEST THAT WORKS.THE SEAT MOVES OK WITH MANUALSWITCH.
PROCEDURE
(1) Check for continuity of the seat belt buckle
switch in its unbuckled state. Operate the buckle
switch to ensure the contact opens when the seat belt
is buckled. (2) Check for continuity between pin 2 of the
2-way seat belt buckle switch connector, harness
side, to ground. (3) Check for continuity between pin 1 of the
2-way seat belt buckle switch connector, harness
side, to pin 13 of the control module 25-way connec-
tor.
CONDITION: MEMORY RECALLS CAN BE MADE WHILE THE VEHICLE IS IN MOTIONWITH THE SEAT BELT UNBUCKLED.
PROCEDURE
Check for continuity of the circuit between the left
side instrument panel blue 16-way connector cav-
Fig. 20 Memory Switch Continuity
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(3) Use an ohmmeter to test the wiring between
the door switch and the control module in the driv-
er's seat. The circuits should be disconnected from
their components at each end. Repair the wiring as
required for open circuits, terminal push outs, or bad
crimps. If the circuits are good to the control module
but the function is still missing, replace the control
module.
CONDITION: NO MOVEMENT OF THE SEAT, RELAYS CAN BE HEARD CLICKING WHENTHE SEAT SWITCH IS ACTIVATED.
PROCEDURE
(1) Check for battery voltage and ground at the ap-
propriate pins of the control module 10-way connec-
tor (Fig. 23). If the proper results are not obtained,
replace the control module. If the circuits are correct,
then continue the procedure.
(2) Check for continuity of the motor circuits from
the control module 10-way connector to the left
power seat motor package (Fig. 24). (3) Repair the wiring as required for open circuits,
terminal push outs, or bad crimps. If the circuits are
good but the seat movement direction is still missing,
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.
CONDITION: NO MOVEMENT OF THE MEMORY MIRRORS WHEN THE POWERMIRROR SWITCH IS ACTUATED, MEMORYMIRRORS MOVE DURING RECALL ONLY.
PROCEDURE
(1) Check for battery voltage at pin 1 of the mem-
ory mirror switch 8-way connector in the driver's
door. This battery feed is through a diode package
that is located in the left cowl side area. A grounded
wire on the switch side of the diode would most
likely cause the diode package to open. Solder and
tape the connections if replacement is necessary. The
fuse is in cavity 13 of the fuse block. (2) Check for ground at pin 5 of the memory mir-
ror switch 8-way connector. Repair as needed. (3) Check for continuity of the memory mirror
switch. Refer to the Group 8T, Mirror Switch Test
Procedure and the Continuity.
Fig. 23 Control Module 10-Way Connector Voltage and Ground Test
Fig. 24 Control Module 10-Way Connector to PowerSeat Motor Connector Continuity
Ä POWER SEATS 8R - 15

CONDITION: NO MOVEMENT OF BOTH MEMORY MIRRORS OR ONLY ONE MEMORY MIRROR DURING THE RECALL MODE,MEMORY MIRRORS WILL MOVE ONLY WHENTHE POWER MIRROR SWITCH IS ACTUATED.MEMORY SEAT AND RECLINER MOVE INRECALL.
PROCEDURE
(1) Determine the fault precisely. If all memory
mirror recall movements appear to be missing, first
set the mirrors to two different vertical and horizon-
tal positions for both mirrors. Refer to the General
Information paragraph at the beginning of this sec-
tion for position setting instructions. Try to recall
these set positions that were just placed in memory. (2) Observe for no movement in a specific direction
for a specific mirror. If there is still no movement of
either mirror in any direction, re place the control
module. Perform the memory seat diagnostic self
check so the control module will learn the new soft
limits of the assembly. If the non-movement is in a
specific direction or a specific mirror, continue with
the procedure. (3) Perform the diagnostic self tests, mirror check
mode, to determine if the fault is with a motor or
with a position sensing rheostat circuit. Refer to
Memory Seat and Mirror Diagnostic Self-Tests expla-
nation for further information and understanding of
the diagnostic process and identifying of the fault. If
the fault is with a motor, continue this procedure as
follows in step (4) below. If the fault is with a rheo-
stat, as indicated by the mirror nod in the vertical or
horizontal plane, continue the procedure with step (5)
of this procedure that follows. (4) Check for continuity of the motor drive circuits
between the control module 25-way connector and
the mirror 8-way connector (Fig. 25 and 26). Repair open wiring, terminal push outs or bad
crimps as necessary to correct the fault. If there is
still no recall movement of an individual mirror after
ensuring continuity of the motor drive circuits, then
replace the control module. Perform the memory seat
diagnostic self check so the control module will learn
the new soft limits of the assembly. (5) Check for continuity of the position sensing
rheostat circuits at the disconnected 25-way connec-
tor under the driver's seat. Connect an ohmmeter be-
tween the cavities of the 25-way connector as
indicated in the charts for the left or right mirrors as
required (Fig. 27). If the resistance values cannot be
obtained, i.e., an open circuit, continue the proce-
dure. (6) Check for continuity of the position sensing
rheostat circuits between the control module 25-way
connector and the mirror 8-way connector for the left
or right mirrors as required (Fig. 28). Repair the
open wiring, terminal push outs or bad crimps as necessary to correct the fault. If continuity exists in
these circuits, then continue this procedure.
Fig. 25 Control Module 25-Way Connector to Mirror 8-Way Connector Continuity
Fig. 26 Mirror 8-Way Connector and 25-Way Control Module Connector
8R - 16 POWER SEATS Ä

(7) Check for resistance values in the left or right
mirror assembly as indicated by the diagnostic self
test fault locator. Connect an ohmmeter between the
mirror 8-way connector cavities as shown in the
chart (Fig. 29). Both left and right mirrors use the
same cavities. As the mirror face is moved manually
the resistance value will change between the values
given in the chart. If these results are not obtained,
replace the mirror assembly. (8) If the resistance values from procedure (5) can-
not be obtained and indicate a short to ground or
battery, use an ohmmeter to isolate the circuits and
components at fault. If the fault is in the wiring har-
ness, repair or replace the wiring harness as neces-
sary. If the fault is in the mirror, replace the mirror
assembly. (9) If after checking the rheostat circuits of an in-
dividual mirror and all circuits are correct then re-
place the control module. Perform the memory seat
diagnostic self check so the control module will learn
the new soft limits of the assembly.
POWER RECLINER MOTOR AND CABLE
REMOVAL
(1) Remove seat assembly from vehicle, following
procedure outlined under Seat Assembly Removal. (2) Remove seat outboard side shields to expose re-
cliner and cable (Fig. 30). (3) Remove cable housing clip from cushion frame.
(4) Remove cable housing clamp from the recliner
transmission housing, and remove drive cable. (5) Lay seat on its back on some clean surface.
(6) Remove four bolts, attaching the power seat
track to cushion frame. (7) Remove two motor attachment screws from
power seat track cross strap. (8) Disconnect recliner motor connectors.
Fig. 27 Sensing Rheostat ResistanceFig. 28 Sensing Rheostat Continuity
Fig. 29 Mirror Rheostat Resistance
Ä POWER SEATS 8R - 17