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Page 582 of 2399
DOOR LOCK CIRCUIT PROTECTION
The BCM controls the door lock output drivers. If
the door lock switch is actuated continuously for
more than one second the BCM will turn the output
driver OFF (the BCM would consider the switch
stuck). The lock motors are protected with Positive
Temperature Coefficient (PTC) device that prevents
motor burn out.
REMOTE KEYLESS ENTRY SYSTEM
²LOCK: Pressing the LOCK button locks all
doors and sounds horn (chirp) and arm the Vehicle
Theft Security System, if equipped. The chirp verifies
that the RKE receiver has sent a message to the
BCM for door lock operation. If a door has not been
closed before pressing the LOCK button, the vehicle
may not be secured and the VTSS will not arm until
the door is closed.
²UNLOCK: Pressing the UNLOCK button once
will unlock the driver's side doors and activate the
illuminated entry system and disarm Vehicle Theft
Security System, if equipped. Pressing the UNLOCK
button twice within five seconds will unlock all doors
and activate the illuminated entry system.
²LEFT SLIDING DOOR: Pressing the LEFT
SLIDING DOOR BUTTON opens/closes the left
power sliding door remotely.
²RIGHT SLIDING DOOR: Pressing the RIGHT
SLIDING DOOR BUTTON opens/closes the right
power sliding door remotely.
²LIFTGATE:
Pressing the LIFTGATE BUTTON
opens/closes the liftgate remotely, if equipped.If not
equipped with power liftgate, pressing the liftgate but-
ton will allow a one time 30 second access to liftgate.
²PANIC: Pressing the PANIC button sounds the
horns at half second intervals, flashes the exterior
lamps, and turns ON the interior lamps. The panic
alarm will remain on for three minutes, or until the
PANIC button is actuated again or the ignition
switch is turned to the RUN position.
The Remote Keyless Entry Module is capable of
retaining the transmitter Vehicle Access Code(s)
(VAC) in its memory even after vehicle power has
been interrupted.
NOTE: Additional features available to the customer
are described in the Vehicle Owners Manual.
The RKE system activates the optional memory
seat, mirror system and adjustable pedals, if
equipped. Two primary key fob transmitters can be
programmed to actuate memory seat and mirror set-
ting 1 or 2. Two additional key fob transmitters can be
added, but they will not be able to operate the mem-
ory seat and mirror system (Refer to 8 - ELECTRI-
CAL/POWER SEATS - OPERATION) and (Refer to 8 -
ELECTRICAL/POWER MIRRORS - OPERATION).
DOOR CYLINDER LOCK
SWITCH
DESCRIPTION
The Door Cylinder Lock Switch is used to:
²Unlock/Lock all the doors via the Central Lock-
ing feature.
²Arm/Disarm the Vehicle Theft Security System.
²Trigger the Illuminated Entry feature.
The door cylinder lock switch is mounted to the
rear of the driver and passenger door lock cylinders.
When installed on the rear of the cylinder, there is a
tab on the lock cylinder that aligns with the switch
to prevent it from turning. An anti-rotating device.
The door cylinder lock switch is a one time use
switch. Once it is removed from the rear of the door
lock cylinder, it may not be reinstalled and a new
switch must be used.
OPERATION
When the Door Cylinder Lock Switch is turned
either way using the door key cylinder, the BCM
reads a direct message signal from the switch, via
the Programmable Communication Interface (PCI)
bus.
If turning the key cylinder once, toward the front
of the vehicle (for either driver or passenger doors),
this will:
(1) Mechanically unlock the door lock.
(2) Disarm the Vehicle Theft Security System (if
equipped).
(3) Turn on the Illuminated Entry (if equipped) for
approximately 30 seconds.
If the key cylinder is turned to the unlock position
(toward the front of vehicle) twice within two sec-
onds, all the doors and liftgate will unlock (if
equipped with the central locking feature).
To lock the vehicle using the door cylinder lock
switch, turn the key cylinder toward the rear of the
vehicle (either passenger or driver doors) once. This
will lock the door that you are using the key on. If
equipped with the central locking feature, this will
lock all the other doors and liftgate. Furthermore,
this will arm the vehicle theft security system and
turn off the illuminated entry.
DIAGNOSIS AND TESTING - DOOR CYLINDER
LOCK SWITCH
(1) Visually inspect the switch for proper installa-
tion. Make sure it is seated on the rear of the key
cylinder, with the tab of the door key cylinder prop-
erly aligned with the slot on the door cylinder lock
switch.
(2) Disconnect the switch at the harness connector
and check the resistance in each switch position.
RSPOWER LOCKS8N-41
POWER LOCKS (Continued)
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REMOTE KEYLESS ENTRY
MODULE
DESCRIPTION
The RKE module is capable of retaining up to four
different Vehicle Access Codes.
OPERATION
Whenever the vehicle battery power is interrupted
the RKE Module will retain all vehicle access codes
in its memory. When replacing or adding a key fob
transmitter (maximum 4) a DRB IIItscan tool is
required to program the RKE Module to accept the
new Vehicle Access Code if a customer owned trans-
mitter is not available. Refer to Electrical, Remote
Keyless Entry Module, Standard Procedure - Pro-
gramming RKE Module or the Proper Body Diagnos-
tic Procedures manual.
DIAGNOSIS AND TESTING - REMOTE KEYLESS
ENTRY MODULE
Refer to the appropriate wiring information. The
wiring information includes wiring diagrams, proper
wire and connector repair procedures, further details
on wire harness routing and retention, as well as
pin-out and location views for the various wire har-
ness connectors, splices and grounds. Refer to the
proper Body Diagnostic Procedures Manual for test-
ing the Remote Keyless Entry system using a DRB
IIItscan tool. Also refer to other interrelated sys-
tems groups within this manual:
²Vehicle Theft Security System
²Power Seats
²Power Mirrors
STANDARD PROCEDURE - PROGRAMMING
RKE MODULE
(1) Using a functional key fob transmitter, unlock
the vehicle and disarm the Vehicle Theft Security
System.
(2) Insert ignition key into the ignition switch.
(3) Turn the ignition switch to RUN position with-
out starting engine.
(4) Using a functional key fob transmitter, press
and hold the UNLOCK button for a minimum five
seconds (maximum ten seconds).
(5) While still holding UNLOCK button, and
before ten seconds passes, press the PANIC button
and release both at the same time. A single chime
will sound to verify that the RKE module is set to
receive the new Vehicle Access Code(s).
(6) Within 30 seconds of the chime, press and
release the ªLOCKº and ªUNLOCKº buttons on the
transmitter at the same time. Then press and release
any one of the buttons. The BCM will sound anabbreviated chime to acknowledge that the program-
ming of the transmitter has been completed and was
successful.
(7) Repeat step 6 for all transmitters that will be
used with this vehicle (up to 4 total).
(8) Programming mode will last for 30 seconds. To
get out of programming mode sooner, turn the igni-
tion OFF. A single chime will sound to verify that the
RKE module will no longer accept additional Vehicle
Access Code(s).
(9) When Vehicle Access Code(s) programming is
complete, turn the ignition switch to the OFF posi-
tion and verify RKE system operation using each key
fob.
NOTE:
Only the two key fob transmitters that have been
programmed to the memory seat and mirror system
will operate it. If any key fob is replaced, the mem-
ory seat and mirror module will require program-
ming. (Refer to 8 - ELECTRICAL/POWER SEATS -
DIAGNOSIS AND TESTING).
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove instrument panel top cover (Refer to
23 - BODY/INSTRUMENT PANEL/INSTRUMENT
PANEL TOP PAD - REMOVAL).
(3) Remove screws holding RKE module to instru-
ment panel.
(4) Disconnect wire connector from RKE module
(Fig. 4).
(5) Remove the RKE module from vehicle.
Fig. 4 RKE MODULE
1 - REMOTE KEYLESS ENTRY MODULE
2 - INSTRUMENT PANEL
3 - DEMISTER DUCT
8N - 44 POWER LOCKSRS
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POWER MIRRORS
TABLE OF CONTENTS
page page
POWER MIRRORS
DESCRIPTION.........................46
OPERATION...........................46
DIAGNOSIS AND TESTING - POWER
MIRRORS...........................46
AUTOMATIC DAY / NIGHT MIRROR
DESCRIPTION.........................47
OPERATION...........................47
DIAGNOSIS AND TESTING - AUTOMATIC DAY
/ NIGHT MIRROR......................48
REMOTE SWITCH
DIAGNOSIS AND TESTING - REMOTE
SWITCH............................49REMOVAL.............................49
INSTALLATION.........................49
SIDEVIEW MIRROR
REMOVAL.............................49
POWER FOLDAWAY MIRROR SWITCH -
EXPORT
DESCRIPTION.........................49
OPERATION...........................50
REMOVAL.............................50
INSTALLATION.........................50
POWER MIRRORS
DESCRIPTION
If equipped with power mirrors, the control switch
is located on the instrument panel to the left of the
headlamp switch.
OPERATION
The power mirrors are connected to battery feed at
all times. Each mirror head contains two electric
motors, two drive mechanisms, an electric heating
element, and the mirror glass. If the vehicle is
equipped with the optional memory system, each
mirror head also contains both a horizontal and a
vertical motor position sensor. One motor and drive
controls mirror up-and-down movement, and the
other controls right-and-left movement.
An optional driver side outside electrochromic mir-
ror is able to automatically change its reflectance
level. This mirror is controlled by the circuitry of the
automatic day/night inside rear view mirror. A thin
layer of electrochromic material between two pieces
of conductive glass make up the face of the mirror.Two photocell sensors on the inside rear view mirror
are used to monitor light levels and adjust the reflec-
tance of both the inside and driver side outside mir-
rors. This change in reflectance helps to reduce the
glare of headlamps approaching the vehicle from the
rear. (Refer to 8 - ELECTRICAL/POWER MIRRORS/
AUTOMATIC DAY / NIGHT MIRROR - DESCRIP-
TION) for more information on this system.
The motors which operate the mirrors are part of
the mirror assembly and cannot be serviced sepa-
rately.
DIAGNOSIS AND TESTING - POWER MIRRORS
(1) Remove Power Mirror Switch. (Refer to 8 -
ELECTRICAL/POWER MIRRORS/POWER MIRROR
SWITCH - REMOVAL).
(2) Disconnect wiring harness connector to the
power mirror switch and headlamp switch.
(3) Using two jumper wires:
²Connect one to a 12-volt source
²Connect the other to a good body ground
²Refer to the Mirror Test Chart for wire hookups
at the switch connector (Fig. 1).
8N - 46 POWER MIRRORSRS
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POWER MIRROR MOTOR TEST
SWITCH CONNECTOR
12 Volts Ground MIRROR REACTION
Right Left
PIN 12 PIN 6 Ð UP
PIN 7 PIN 6 Ð LEFT
PIN 6 PIN 12 Ð DOWN
PIN 6 PIN 7 Ð RIGHT
PIN 13 PIN 1 UP Ð
PIN 8 PIN 1 LEFT Ð
PIN 1 PIN 13 DOWN Ð
PIN 1 PIN 8 RIGHT Ð
PIN 5 PIN 11 LAMP LAMP
(4) If results shown in table are not obtained,
check for broken or shorted circuit, or replace mirror
assembly as necessary.
AUTOMATIC DAY / NIGHT
MIRROR
DESCRIPTION
An automatic dimming inside day/night rear view
mirror and an automatic dimming driver side outside
rear view mirror are available factory-installed
options on this model. Following is a general descrip-
tion of this optional equipment.
The automatic day/night mirror is able to automat-
ically change its reflectance. A thin layer of electro-
chromic material between two pieces of conductiveglass make up the face of the mirror. Two photocell
sensors are used to monitor light levels and adjust
the reflectance of the mirror to reduce the glare of
headlamps approaching the vehicle from the rear.
For removal procedures, (Refer to 23 - BODY/IN-
TERIOR/REAR VIEW MIRROR - REMOVAL).
OPERATION
The ambient photocell sensor faces forward, to
detect the outside light levels. A second sensor faces
rearward to detect the light level received through
the vehicles back window. When the difference
between the two light levels becomes too great (the
light level received at the rear of the mirror is much
higher than that at the front of the mirror), the mir-
ror begins to darken.
Fig. 1 Power Mirror Connector
RSPOWER MIRRORS8N-47
POWER MIRRORS (Continued)
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Page 589 of 2399
The mirror switch allows the driver a manual con-
trol of whether the automatic dimming feature is
operational. When AUTO is selected a small Light-
Emitting Diode (LED), to the right of the mirror
switch, is illuminated. The automatic dimming fea-
ture will only operate when the ignition switch is in
the On position. The mirror also senses the backup
lamp circuit, and will automatically disable its self-
dimming feature whenever the transmission gear
selector is in the Reverse position.
NOTE: The mirror always defaults to an ON state
upon ignition.
The driver side automatic dimming mirror is stan-
dard with the automatic dimming inside mirror. The
signal to control the dimming of that mirror is gen-
erated by the automatic day/night inside rear view
mirror circuitry. That signal is then delivered to the
driver side outside rear view mirror on a hard wired
circuit.
The automatic day/night mirror cannot be
repaired. If faulty or damaged, the entire inside rear
view mirror assembly must be replaced.
DIAGNOSIS AND TESTING - AUTOMATIC DAY /
NIGHT MIRROR
For circuit descriptions and diagrams, refer to the
appropriate wiring information. The wiring informa-
tion includes wiring diagrams, proper wire and con-
nector repair procedures, details of wire harness
routing and retention, connector pin-out information
and location views for the various wire harness con-
nectors, splices and grounds.
(1) Check the fuse in the intelligent power module.
If OK, go to Step 2. If not OK, repair the shorted cir-
cuit or component as required and replace the faulty
fuse.
(2) Turn the ignition switch to the On position.
Check for battery voltage at the fuse in the intelli-
gent power module. If OK, go to Step 3. If not OK,
repair the open circuit to the ignition switch as
required.
(3) Unplug the wire harness connector from the
automatic day/night mirror. Check for battery voltage
at the fused ignition switch output circuit cavity of
the automatic day/night mirror wire harness connec-
tor. If OK, go to Step 4. If not OK, repair the open
circuit to the junction block as required.
(4) Turn the ignition switch to the Off position.
Check for continuity between the ground circuit cav-
ity of the automatic day/night mirror wire harness
connector and a good ground. There should be conti-
nuity. If OK, go to Step 5. If not OK, repair the cir-
cuit to ground as required.(5) Turn the ignition switch to the On position. Set
the parking brake. Place the transmission gear selec-
tor lever in the Reverse position. Check for battery
voltage at the backup lamp switch output circuit cav-
ity of the automatic day/night mirror wire harness
connector. If voltage is present, reinstall the auto-
matic day/night mirror wire harness connector and
go to Step 6. If not OK, repair the open circuit as
required.
(6) Place the transmission gear selector lever in
the Neutral position. Place the automatic day/night
mirror switch in the On (LED in the switch is
lighted) position. Cover the forward facing ambient
photocell sensor to keep out any ambient light.
NOTE: The ambient photocell sensor must be cov-
ered completely, so that no light reaches the sen-
sor. Use a finger pressed tightly against the sensor,
or cover the sensor completely with electrical tape.
(7) Shine a light into the rearward facing head-
lamp photocell sensor. The automatic day/night mir-
ror should darken. The automatic day/night mirror
should darken within 2 minutes if testing for the
first time. For immediate response, turn the vehicle
OFF and back ON with the forward-facing light sen-
sor still covered. This defeats the day-detect logic. If
OK, go to Step 8. If not OK, replace the faulty mirror
unit.
(8) With the mirror darkened, place the transmis-
sion gear selector lever in the Reverse position. The
automatic day/night mirror should return to its nor-
mal reflectance. If not OK, replace the faulty mirror
unit.
Bench testing both mirrors can be done, of care is
exercised. For an inside mirror, the pin closest to he
mount is 12V (+), the next is 12V (-). The third is
reverse override. The fourth is outside mirror (+),
and the fifth is outside mirror (-).Do not apply 12
volts to the fourth and fifth pins.With 12 volts
on pins 1 and 2, the mirror can be tested by blocking
the rear sensor and shining a light into the forward
sensor. For an outside mirror, there is a 2±pin con-
nector. Applying 1.2 volts will cause the mirror to
dim. If the mirror does not dim, the entire glass
assembly can be replaced just as it is when the glass
is broken.
WARNING: Do not apply 12 volts to the outside mir-
ror. Damage to the mirror will result.
8N - 48 POWER MIRRORSRS
AUTOMATIC DAY / NIGHT MIRROR (Continued)
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REMOTE SWITCH
DIAGNOSIS AND TESTING - REMOTE SWITCH
(1) Remove power mirror switch. (Refer to 8 -
ELECTRICAL/POWER MIRRORS/POWER MIRROR
SWITCH - REMOVAL).
(2) Disconnect wiring harness at switch connector.
(3) Using a ohmmeter, test for continuity between
the terminals of the switch (Fig. 2).
MIRROR SWITCH TEST
MIRROR SELECT SWITCH IN ªLEFTº
POSITION
Move
ButtonContinuity Between
UP PIN 9 - PIN 12,
PIN 6 - PIN 11,
PIN 9 - PIN 13
LEFT PIN 9 - PIN 7,
PIN 6 - PIN 11,
PIN 9 - PIN 8
DOWN PIN 9 - PIN 6,
PIN 12 - PIN 11,
PIN 13 - PIN 11
RIGHT PIN 9 - PIN 6,
PIN 7 - PIN 11,
PIN 8 - PIN 11
MIRROR SELECT SWITCH IN ªRIGHTº
POSITION
Move
ButtonContinuity Between
UP PIN 9 - PIN 13,
PIN 1 - PIN 11,
PIN 9 - PIN 12
LEFT PIN 9 - PIN 8,
PIN 1 - PIN 11,
PIN 9 - PIN 7
DOWN PIN 9 - PIN 1,
PIN 13 - PIN 11,
PIN 12 - PIN 11
RIGHT PIN 9 - PIN 1,
PIN 8 - PIN 11,
PIN 7 - PIN 11
LAMP PIN5-PIN11(4) If results shown in the table are not obtained,
replace the switch.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove instrument panel lower cover.
(3) From behind headlamp switch assembly,
depress retaining tabs and push switch from instru-
ment panel.
(4) Disconnect wire connector from power mirror
switch.
(5) Disengage lock tabs above and below the mir-
ror switch.
(6) Remove power mirror switch from headlamp
switch bezel.
INSTALLATION
(1) Install power mirror switch to the headlamp
switch bezel.
(2) Connect wire connector to the power mirror
switch.
(3) Insert headlamp switch assembly into instru-
ment panel.
(4) Install instrument panel lower cover.
(5) Connect battery negative cable.
SIDEVIEW MIRROR
REMOVAL
For service procedures, (Refer to 23 - BODY/EXTE-
RIOR/SIDE VIEW MIRROR - REMOVAL).
POWER FOLDAWAY MIRROR
SWITCH - EXPORT
DESCRIPTION
These vehicles may be equipped with Power Fold-
away Mirrors. This feature allows both the driver
and passenger side view mirrors to fold inward
(retract) on demand. The vehicle has an additional
switch located on the steering column that controls
the folding function of the mirror assembly (Fig. 3).
The fold-away side view mirror is attached to the
vehicle's door in the same manner as mirrors without
the fold-away option. The fold-away mirrors unique
option is the internal motor which allows the mirrors
to fold inward on demand. The fold-away mirror
motor is not serviceable separately and if a motor is
found to be faulty the entire side view mirror must
be replaced.
Fig. 2 Mirror Switch
RSPOWER MIRRORS8N-49
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OPERATION
When the mirror retract switch is depressed, both
of the side view mirrors will fold inward, Thus mak-
ing the overall width of the vehicle the smallest pos-
sible. This can be helpful were parking space is a
absolute minimum.
When the driver's door is opened, only the driver's
door mirror will unfold. If the passenger door is
opened, both mirrors will unfold.
The power fold away mirror system consists of the
following components: mirror switch, side view mir-
ror, relay, wires and fuse. Refer to the appropriate
wiring information. The wiring information includes
wiring diagrams, proper wire and connector repair
procedures, details of wire harness routing and
retention, connector pin-out information and location
views for the various wire harness connectors, splices
and grounds.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the upper and lower steering column
shroud (Refer to 19 - STEERING/COLUMN/LOWER
SHROUD - REMOVAL).
(3) Disconnect electrical harness connector.
(4) Remove switch from steering column shroud
(Fig. 4).
INSTALLATION
(1) Install switch to steering column shroud.
(2) Connect wire harness connector.
(3) Install the upper and lower steering column
shroud (Refer to 19 - STEERING/COLUMN/LOWER
SHROUD - INSTALLATION).
(4) Connect the battery negative cable.
Fig. 3 POWER FOLDAWAY MIRROR SWITCH
1 - POWER FOLDAWAY MIRROR SWITCH
2 - STEERING COLUMN
Fig. 4 POWER FOLDING MIRROR SWITCH
1 - STEERING COLUMN SHROUD
2 - POWER FOLDAWAY SWITCH
8N - 50 POWER MIRRORSRS
POWER FOLDAWAY MIRROR SWITCH - EXPORT (Continued)
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POWER SEAT SYSTEM
TABLE OF CONTENTS
page page
POWER SEAT SYSTEM
DESCRIPTION
DESCRIPTION........................51
DESCRIPTION - MEMORY SYSTEM.......52
OPERATION
OPERATION - POWER SEAT SYSTEM.....53
OPERATION - MEMORY SYSTEM.........53
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - POWER SEAT
SYSTEM............................53
DIAGNOSIS AND TESTING - MEMORY
SYSTEM............................54
DRIVER SEAT SWITCH
DESCRIPTION.........................54
OPERATION...........................55
DIAGNOSIS AND TESTING - DRIVER SEAT
SWITCH............................55
REMOVAL.............................55
INSTALLATION.........................56
MEMORY SET SWITCH
DESCRIPTION.........................56
OPERATION...........................56
DIAGNOSIS AND TESTING - MEMORY
SWITCH............................57
REMOVAL.............................57
INSTALLATION.........................57
PASSENGER SEAT SWITCH
DESCRIPTION.........................57OPERATION...........................57
DIAGNOSIS AND TESTING - PASSENGER
SEAT SWITCH........................58
REMOVAL.............................58
INSTALLATION.........................59
MEMORY MIRROR/SEAT MODULE
DESCRIPTION.........................59
OPERATION...........................59
DIAGNOSIS AND TESTING - MEMORY
MIRROR/SEAT MODULE................59
REMOVAL.............................59
INSTALLATION.........................59
DRIVER POWER SEAT TRACK
DESCRIPTION.........................60
OPERATION...........................60
DIAGNOSIS AND TESTING - DRIVER POWER
SEAT TRACK.........................60
REMOVAL.............................61
INSTALLATION.........................61
PASSENGER POWER SEAT TRACK
DESCRIPTION.........................61
OPERATION...........................62
DIAGNOSIS AND TESTING - POWER SEAT
TRACK.............................62
REMOVAL.............................62
INSTALLATION.........................63
POWER SEAT SYSTEM
DESCRIPTION
DESCRIPTION
The power seat system option allows the driver
and front seat passenger to electrically adjust their
seating positions for optimum control and comfort
using the power seat switches located on the out-
board seat cushion side shield of each front seat.
Both power front seats can be adjusted in eight dif-
ferent directions up, down, front up, front down, rear
up, rear down, forward, rearward and recliner for-
ward and rearward.
The power seat system receives battery current
through a 40 amp fuse in the Intelligent Power Mod-
ule and a 30 amp circuit breaker under the seat sothat the power seats remain operational, regardless
of the ignition switch position.
WARNING: SOME VEHICLES ARE EQUIPPED WITH
SEATBACK MOUNTED AIRBAGS (Fig. 1). BEFORE
ATTEMPTING TO DIAGNOSE OR SERVICE ANY
SEAT OR POWER SEAT SYSTEM COMPONENT
YOU MUST FIRST DISCONNECT AND ISOLATE THE
BATTERY NEGATIVE CABLE. THEN WAIT TWO MIN-
UTES FOR THE SYSTEM CAPACITOR TO DIS-
CHARGE BEFORE FURTHER SYSTEM SERVICE.
THIS IS THE ONLY SURE WAY TO DISABLE THE
AIRBAG SYSTEM. FAILURE TO DO SO COULD
RESULT IN ACCIDENTAL AIRBAG DEPLOYMENT
AND POSSIBLE PERSONAL INJURY.
A eight-way power seat is standard on highline
models and optional on others. This option includes a
eight-way adjustable seat cushion track and a two-
way power seat back.
RSPOWER SEAT SYSTEM8N-51
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The eight-way power seat is also available with the
heated seat and memory seat system that automati-
cally positions the power seat for two different driv-
ers. Refer toHeated Seatsfor more information on
the heated seat option. Refer toDescription Mem-
ory Seat Systemin this section for more informa-
tion on the memory seat system.
The power seat system includes the following com-
ponents:
²Power seat recliners
²Power seat switches
²Power seat tracks
²Circuit breaker
The power seat system with memory and heated
seat options includes the following components:
²Power seat recliner
²Power seat switch
²Power seat track.
²Memory Seat Mirror Module (MSMM)
²Memory set switch
²Heated Seat Module (HSM)
²Heated seat switch
²Electronic Vehicle Information Center (EVIC)
²Programmable Communications Interface (PCI)
data bus network
Refer to Wiring Diagrams for complete circuit dia-
grams. Following are general descriptions and opera-
tions for the major components in the power seat
system and memory seat system.
DESCRIPTION - MEMORY SYSTEM
An electronic memory system is available on some
models. The memory system is able to store and
recall the driver side power seat positions (including
the power recliner position) and both outside side
view mirrors positions for two drivers. On vehicles
equipped with a factory radio, the memory system is
also able to store and recall radio station presets for
two drivers. The memory system also will store and
recall the last station listened to for each driver, even
if it is not one of the preset stations.
The memory system will automatically return to
its preset settings when the corresponding numbered
button of the memory switch is depressed, or when
the doors are unlocked using the corresponding
Remote Keyless Entry (RKE) transmitter. A customer
programmable feature of the memory system allows
the RKE recall of memory features to be disabled, if
desired. This programmable feature is internal in the
EVIC module, which is located in the overhead con-
sole.
A Memory Seat Mirror Module (MSMM) is used on
some models to control and integrate the many elec-
tronic functions and features included in the memory
seat and mirror systems.
The memory system includes the following compo-
nents:
²Memory Seat Mirror Module (MSMM)
²Memory set switch
²Position potentiometers on both outside side
view mirrors
²Position potentiometers on the driver side power
seat track and power seat recliner motors.
²Electronic Vehicle Information Center (EVIC)
²Radio receiver (if PCI data bus capable).
Certain functions of the memory system rely upon
resources shared with other electronic modules in the
vehicle over the Programmable Communications
Interface (PCI) J1850 data bus network. The PCI
data bus network allows the sharing of sensor infor-
mation. This helps to reduce wire harness complexity,
internal controller hardware, and component sensor
current loads. At the same time, this system provides
increased reliability, enhanced diagnostics, and
allows the addition of many new feature capabilities.
Initial diagnosis of these electronic modules or the
PCI data bus network requires the use of a DRB IIIt
scan tool and the proper Diagnostic Procedures man-
ual. If this method does not prove conclusive, the use
of a automotive meter such as the Fluket, the proper
wiring schematics and the service manual diagnostic
routines are required.
The other electronic modules that may affect mem-
ory system operation are as follows:
Fig. 1 Identifying a Side Airbag Equipped Seat
1 - Airbag Label
8N - 52 POWER SEAT SYSTEMRS
POWER SEAT SYSTEM (Continued)
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²Body Control Module (BCM)- Refer toBody
Control Modulein Electronic Control Modules for
more information.
²Powertrain Control Module (PCM)- Refer to
Powertrain Control Modulein Electronic Control
Modules for more information.
Refer toHeated Seat Systemfor more informa-
tion on the heated seat system. Refer toRemote
Keyless Entry Systemin Power Lock Systems for
more information on the RKE system.
Refer toWiring Diagramsfor complete circuit
diagrams. Following are descriptions, theory of oper-
ation, diagnosis/testing procedures and removal/in-
stallation procedures of the major components in the
memory and power seat systems.
OPERATION
OPERATION - POWER SEAT SYSTEM
The power seat system receives battery current
through fuse #22 in the Intelligent Power Module
and a circuit breaker under the front seats, regard-
less of the ignition switch position.
When a power seat switch control knob or knobs
are actuated, a battery feed and a ground path are
applied through the switch contacts to the appropri-
ate power seat track adjuster motor. The selected
adjuster motor operates to move the seat track
through its drive unit in the selected direction until
the switch is released, or until the travel limit of the
seat track is reached. When the switch is moved in
the opposite direction, the battery feed and ground
path to the motor are reversed through the switch
contacts. This causes the adjuster motor to run in the
opposite direction.
No power seat switch should be held applied in any
direction after the seat track has reached its travel
limit. The power seat track each contain a self-reset-
ting circuit breaker to protect them from overload.
However, consecutive or frequent resetting of the cir-
cuit breaker must not be allowed to continue, or the
motor may be damaged. Refer to the owner's manual
in the vehicle glove box for more information on the
features, use and operation of the power seat system.
OPERATION - MEMORY SYSTEM
The memory system receives battery current
through fuse #22 in the Intelligent Power Module
and the power seat system circuit breaker, located
under each front seat near the rear edge of the seat
cushion pans. The Memory Seat Mirror Module
(MSMM) will drive a maximum of 2 motors at a time
in a given direction. If conflicting directions are
requested, the priority for response will be as follows:
²Seat Track Rearward or Forward²Seat Front Down or Up
²Seat Rear Down or Up
²Recliner Rearward or Forward
The inputs from these switches to the MSMM is a
current limited battery source fed by the MSMM.
This protects the MSMM printed circuit board traces
from acting as fuses. All of these switch contact
inputs to the MSMM are normally closed to ground,
except when actuated.
See the owner's manual in the vehicle glove box for
more information on the features, use and operation
of the memory system. For diagnosis of the MSMM,
the PCI data bus, or the other electronic modules on
the PCI data bus that provide inputs and outputs for
the memory system, the use of a DRBIIItscan tool
and the proper Diagnostic Procedures manual are
recommended.
ELECTRONIC VEHICLE INFORMATION CENTER
The Electronic Vehicle Information Center (EVIC)
serves as the user interface for the memory system.
It displays memory system status messages and pro-
vides the user with the means for enabling and dis-
abling the many customer programmable features
available on the vehicle, including those for the mem-
ory system.
See the owner's manual in the vehicle glove box for
more information on the features, use and operation
of the EVIC. Refer toElectronic Vehicle Informa-
tion Centerin Overhead Console Systems for more
information on the EVIC.
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - POWER SEAT
SYSTEM
Following are tests that will help to diagnose the
hard wired components and circuits of the power seat
system. However, if the vehicle is also equipped with
the optional memory system, these tests may not
prove conclusive in the diagnosis of the driver side
power seat. In order to obtain conclusive testing of
the driver side power seat with the memory system
option, the Programmable Communications Interface
(PCI) data bus network and all of the electronic mod-
ules that provide inputs to, or receive outputs from
the memory system components must be checked.
The most reliable, efficient, and accurate means to
diagnose the driver side power seat with the memory
system option requires the use of a DRB IIItscan
tool and the proper Diagnostic Procedures manual.
The DRB IIItscan tool can provide confirmation that
the PCI data bus is functional, that all of the elec-
tronic modules are sending and receiving the proper
messages on the PCI data bus, and that the memory
RSPOWER SEAT SYSTEM8N-53
POWER SEAT SYSTEM (Continued)
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