2005 CHRYSLER CARAVAN ECU

DIAGNOSIS AND TESTING
MEMORY SWITCH
(1) Remove the memory switch from the drivers
door panel (Refer to 8 - ELECTRICAL/POWER
SEATS/MEMORY SET SWITCH - REMOVAL).
(2) Using an ohmmeter, check the continuity of the
memory select switch MUX circuit between the C2
wire harness connector for the Body Control Module
(BCM) and the wire harness connector for the mem-
ory switch. There should be continuity. If OK, go to
Step 3. If not OK, repair the open or shorted MUX
circuit as required.
(3) Using an ohmmeter, check the continuity of the
memory select switch return circuit between the C2
wire harness connector for the BCM and the wire
harness connector for the memory switch. There
should be continuity. If OK, go to Step 4. If not OK,
repair the open or shorted return circuit as required.
(4) Using an ohmmeter, test the resistances of the
memory switch, refer to the MEMORY SWITCH
TEST TABLE. If OK, (Refer to 8 - ELECTRICAL/
POWER SEATS - DIAGNOSIS AND TESTING -
MEMORY SYSTEM). If not OK, replace the memory
switch, (Refer to 8 - ELECTRICAL/POWER SEATS/
MEMORY SET SWITCH - REMOVAL).
MEMORY SWITCH TEST TABLE
MEMORY
SWITCH
POSITIONRESISTANCE
BETWEEN
PINSRESISTANCE
RANGE
(OHMS)
NEUTRAL 1&2 24650   5%
(24.65 k)
MEMORY 1 1&2 6850   5%
(6.85 k)
MEMORY 2 1&2 2100   5%
(2.10 k)
SET 1&2 4490   5%
(4.49 k)
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the front door trim panel switch bezel
from the driver side front door. Using a thin flat-
bladed pry tool, gently pry the switch bezel away
from the drivers door trim panel.
(3) Disconnect the memory switch wire harness
connector from the memory switch.
(4) Remove the two screws that secure the memory
switch to the back of the driver side front door trim
panel switch bezel.
(5) Remove the memory switch.
INSTALLATION
(1) Position the memory switch and install and
tighten the two screws that secure the memory
switch to the back of the driver side front door trim
panel switch bezel. Tighten the screws to 2.2 N´m (20
in. lbs.).
(2) Reconnect the memory switch wire harness
connector to the memory switch.
(3) Install the trim panel switch bezel onto the
driver side front door.
(4) Reconnect the battery negative cable.
POWER SEAT TRACK
DESCRIPTION
The power seat option includes an electrically oper-
ated power seat track located under the front seat. If
equipped with Memory System, the front power seat
track on the driver side of the vehicle also provides
the mounting location for the Memory Seat/Mirror
Module (MSMM). The power seat circuit breakers are
mounted on the rear of the power seat track, just
behind the seat rear trim panel. The lower half of the
power seat track is secured to the floor panel via four
studs and nuts that must be accessed from the
underside of the vehicle. Four bolts secure the bot-
tom of the seat cushion pan to the upper half of the
power seat track unit. Four additional bolts secure
the seat back frame to the power seat track unit.
The eight-way power seat track unit includes four
reversible electric motors that are secured to the
upper half of the track unit. Each motor moves the
seat adjuster through a combination of worm-drive
gearboxes and screw-type drive units. Each of the
four power seat track motors used on models
equipped with the optional memory system incorpo-
rate a position potentiometer integral to the motor
assembly, which electronically monitors the motor
position. This enables the memory system to function
by referencing the motor positions programmed into
the memory seat/mirror module.
The front and rear of the seat are operated by two
separate vertical adjustment motors. These motors
can be operated independently of each other, tilting
the entire seat assembly forward or rearward. They
can also be operated in unison by selecting the
proper power seat switch functions, which will raise
or lower the entire seat assembly. A third motor is
the horizontal adjustment motor, which moves the
seat track in the forward and aft directions. The
forth motor is the recliner adjustment motor, which
moves the seat back in the forward and rearward
directions.
The four-way power seat track unit includes two
reversible electric motors that are secured to the
RSPOWER SEAT SYSTEM8N-37
MEMORY SWITCH (Continued)

upper half of the track unit. Each motor moves the
seat adjuster through a combination of worm-drive
gearboxes and screw-type drive units. The horizontal
adjustment motor moves the seat track in the for-
ward and aft directions. The recliner adjustment
motor moves the seat back in the forward and rear-
ward directions.
The power seat track unit cannot be repaired, and
is serviced only as a complete unit. If any component
in this unit is faulty or damaged, the entire power
seat track unit must be replaced.
OPERATION
When the power seat switch control knob or knobs
are actuated, a battery feed and a ground path are
applied through the switch contacts to the power seat
track or recliner adjuster motor. The selected
adjuster motor operates to move the seat track or
recliner through its drive unit in the selected direc-
tion until the switch is released, or until the travel
limit of the adjuster 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 adjuster has reached its travel
limit. The power seat adjuster motors each contain a
self-resetting circuit breaker to protect them from
overload. However, consecutive or frequent resetting
of the circuit breaker must not be allowed to con-
tinue, or the motor may be damaged.
DIAGNOSIS AND TESTING
POWER SEAT TRACK
WARNING: SOME VEHICLES ARE EQUIPPED WITH
SEATBACK MOUNTED AIRBAGS. 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.
Actuate the power seat switch to move the power
seat track adjusters in each direction. The power seat
track adjusters should move in each of the selected
directions. If a power seat track adjuster operates in
one direction only, move the adjuster a short distance
in the opposite direction and test again to be certainthat the adjuster is not at its travel limit. If the
power seat track adjuster still operates in one direc-
tion only, (Refer to 8 - ELECTRICAL/POWER
SEATS/DRIVER SEAT SWITCH - DIAGNOSIS AND
TESTING). If the power seat track adjuster does not
operate in more than one direction, perform the fol-
lowing tests.
TESTING POWER SEAT TRACK MOTORS
(1) Check the power seat circuit breaker under the
seat. If OK, go to Step 2. If not OK, replace the
faulty power seat circuit breaker.
(2) Check for battery voltage at the power seat cir-
cuit breaker under the seat. If OK, go to Step 3. If
not OK, repair the open fused B(+) circuit to the fuse
in the Integrated Power Module (IPM) as required.
(3) Remove the outboard seat cushion side cover,
(Refer to 23 - BODY/SEATS/SEAT CUSHION SIDE
COVERS - REMOVAL). Disconnect the wire harness
connector from the power seat switch. Check for bat-
tery voltage at the fused B(+) circuit cavity of the
power seat switch wire harness connector. If OK, go
to Step 4. If not OK, repair the open fused B(+) cir-
cuit to the power seat circuit breaker under the seat
as required.
(4) Check for continuity between the ground cir-
cuit cavity of the power seat switch wire harness con-
nector and a known good ground. There should be
continuity. If OK, go to Step 5. If not OK, repair the
open ground circuit as required.
(5) Test the power seat switch, (Refer to 8 - ELEC-
TRICAL/POWER SEATS/DRIVER SEAT SWITCH -
DIAGNOSIS AND TESTING). If the switch tests OK,
test the circuits of the power seat wire harness
between the inoperative power seat track adjuster
motor and the power seat switch for shorts or opens.
If the circuits check OK, replace the faulty power
seat track unit. If the circuits are not OK, repair the
power seat wire harness as required.
REMOVAL
WARNING: SOME VEHICLES ARE EQUIPPED WITH
SEATBACK MOUNTED AIRBAGS. 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.
(1) Disconnect and isolate the battery negative
cable.
8N - 38 POWER SEAT SYSTEMRS
POWER SEAT TRACK (Continued)

CONDITION POSSIBLE CAUSES CORRECTION
Binding or sticking of components Establish location of binding and replace
necessary components
Squeaks, Noises and rattles Foreign material in door compartment Remove foreign material
Loose components Check and tighten loose components
Missing stabilizers, bumpers or
anti-rattle componentsCheck to ensure components are present.
Replace as necessary
Misadjusted stabilizers, bumpers or
anti-rattle componentsAdjust components as necessary
Poor door track lubrication Lubricate the front portions of the side door
tracks with9Door EaseT9or equivalent
STANDARD PROCEDURE
POWER SLIDING DOOR LEARN CYCLE
Any time a power sliding door component is removed,
replaced, door adjustment is performed or diagnostic
trouble codes are addressed and erased, a learn cycle
mustbe performed. This learn cycle enables the power
sliding door control module to learn or relearn its critical
information (travel limits, resistance to door travel, etc.)
which allows it to perform properly and safely. To per-
form a power sliding door learn cycle do the following:
(1)Obtain a DRB IIIt, or equivalent scan tool.
Connect the scan tool to the vehicle and check for
any power sliding door system stored diagnostic trou-
ble codes, erase any stored codes. Operate the system
and check to see if any trouble codes return. If any
diagnostic trouble codes return, diagnose, correct and
erase the codes before performing the learn cycle. If a
DRB IIIt, or equivalent scan tool is not available, the
learn cycle can be performed by opening and closing
the power sliding door using any of the normal open/
close command switches. Be certain to cycle the
power sliding door through a complete openand
close cycle or the procedure will not be complete.
(2) Using the scan tool, Go into Test Routine Menu
and select a power open command.
(3) Select a power close command.
(4) The power side door learn cycle is complete.
NOTE: If the power sliding door will not complete a
full cycle, a problem exists with the power sliding door
system. (Refer to 8 - ELECTRICAL/POWER DOORS -
DIAGNOSIS AND TESTING) for additional information.
PUSH-PIN GROMMET REPLACEMENT
Push-pin grommets are used to hold and isolate
the power sliding door motor to and from the door
inner panel. This secures the door motor assembly to
the inner panel and keeps the audible motor vibra-
tions to a minimum. If a push-pin grommet showssigns of wear, it must be replaced. Follow the proce-
dure below if replacement is necessary.
(1) Remove the door motor from the door inner
panel. (Refer to 8 - ELECTRICAL/POWER DOORS/
MOTOR - REMOVAL).
(2) Using a trim panel tool (special tool #C-4755)
or equivalent, remove the push-pin grommets from
the inner panel by pulling them straight out (Fig. 2).
(3) Install the replacement push-pin grommets in
the inner panel and install the door motor(Refer to 8
- ELECTRICAL/POWER DOORS/MOTOR - INSTAL-
LATION).
Fig. 2 SIDE DOOR MOTOR PUSH-PIN GROMMETS
1 - PUSH-PIN GROMMETS
2 - SIDE DOOR INNER PANEL
8N - 48 POWER SLIDING DOOR SYSTEMRS
POWER SLIDING DOOR SYSTEM (Continued)

NOTE: Push in on the push-pins at the clutch hous-
ing (plastic side) until you hear one click. Push in
on the push-pin fasteners at the motor mount
(sheet metal side) until you hear two clicks. This
assures proper installation/attachment of the motor
to the sliding door.
(3) Install the flex shaft by lining up the square
shaped drive shaft with the corresponding hole in the
door motor drive unit and push straight in.
(4) Install the E-clip to secure flex-shaft.
(5) Install the weather shield as necessary.
(6) Install the door trim panel on the sliding door,
(Refer to 23 - BODY/DOORS - SLIDING/TRIM
PANEL - INSTALLATION) for the procedure.
(7) Connect the battery negative cable.
FULL OPEN SWITCH
DESCRIPTION
The full open switch is located in the hold open
latch (Fig. 10) under the sliding door lower hinge.
When the power sliding door control module receives
a ground signal input from the full open switch, and
as long as the cinching latch actuator is not in power
mode or the handle switch is open, the signal indi-
cates that the door is at the full open position.The full open switch is incorporated into the hold
open latch. If the full open switch is inoperative, the
entire hold open latch assembly must be replaced.
OPERATION
The full open switch is triggered by a pawl lever in
the hold open latch. When the full open switch is
closed (circuit to ground) the ratchet has engaged on
the hold open striker and the pawl lever has engaged
on the ratchet, locking the latch from opening and
holding the door in the full open position.
B-PILLAR SWITCH
DESCRIPTION
The B-pillar switches are located on the interior of
the vehicle, on the B-pillar trim panels. These
switches serve as an open and close command switch
for the appropriate power sliding door.
OPERATION
When the B-pillar switch is depressed a signal is
sent to the Body Control Module (BCM), this signal
is then sent to the power sliding door control module,
telling it to start a power open or close cycle. The
child lockout feature must be disabled and the slid-
ing door must be unlocked in order for the B-pillar
switch to function.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Using a trim stick (special tool # C-4755) or
equivalent, gently pry the leading upper edge of the
B-pillar switch away from the B-pillar trim.
(3) Once the upper edge is free from B-pillar trim,
rock the switch out of the switch opening.
(4) Disconnect the B-pillar switch electrical con-
nector. First, slide the connector lock away from the
switch then, depress connector retaining tab while
pulling straight apart.
(5) Remove the B-pillar switch from the vehicle.
INSTALLATION
(1) Connect the B-pillar switch electrical connector.
Slide connector lock toward the switch to lock in
place.
(2) Hook the lower edge of the B-pillar switch on
the B-pillar trim and then push the switch firmly
into position.
(3) Connect the battery negative cable.
Fig. 10 FULL OPEN SWITCH POSITION &
ORIENTATION
1 - HOLD OPEN LATCH ASSEMBLY
2 - HOLD OPEN LATCH CABLE
3 - FULL OPEN SWITCH
8N - 52 POWER SLIDING DOOR SYSTEMRS
SLIDING DOOR MOTOR (Continued)

FLEX DRIVE
DESCRIPTION
The flex drive assembly is located in the lower por-
tion of the power sliding door (Fig. 17) and is used to
connect the door motor to the lower drive unit. An
E-clip is used to secure the flex drive to the motor
assembly, while the flex drive collar is used to secure
the drive to the lower drive unit. The flex drive
assembly is basically a flexible drive shaft for the
power sliding door system. The flex drive assembly is
a replaceable component.
OPERATION
With one end of the flex drive attached to the door
motor and the other attached to the lower drive unit,the flex drive transfers the power and torque from
the motor to the drive unit. A square shaped drive
cable, inside the flex drive assembly engages the
motor drive and rotates to move the door accordingly.
REMOVAL
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the appropriate sliding door trim
panel, (Refer to 23 - BODY/DOORS - SLIDING/TRIM
PANEL - REMOVAL).
(3) Position the weathershield aside to gain access
to the flex drive assembly.
(4) Remove the E-clip from the flex drive assembly
(Fig. 18).
(5) Pull the flex drive straight out of the motor
assembly.
Fig. 17 POWER SLIDING DOOR COMPONENTS
1 - POWER SLIDING DOOR CONTROL MODULE
2 - MODULE RETAINING SCREW
3 - MODULE ELECTRICAL CONNECTORS
4 - DOOR MOTOR ASSEMBLY
5 - FLEX DRIVE ASSEMBLY
6 - DOOR MOTOR RETAINING FASTENERS
7 - DOOR MOTOR ELECTRICAL CONNECTOR
Fig. 18 FLEX DRIVE E-CLIP
1 - FLEX DRIVE CABLE RETAINING CLIP
2 - FLEX DRIVE CABLE
3 - DOOR MOTOR ASSEMBLY
RSPOWER SLIDING DOOR SYSTEM8N-55

SEAT BELT & RETRACTOR - SECOND ROW -
RIGHT OUTBOARD
REMOVAL.............................40
INSTALLATION.........................40
SEAT BELT & RETRACTOR - SECOND ROW -
RIGHT OUTBOARD WITH REAR HVAC - LWB
REMOVAL.............................41
INSTALLATION.........................41
SEAT BELT & RETRACTOR - SECOND ROW -
LEFT OUTBOARD
REMOVAL.............................42INSTALLATION.........................42
SEAT BELT TENSIONER
DESCRIPTION.........................43
OPERATION...........................43
SEAT WEIGHT BLADDER & PRESSURE
SENSOR
DESCRIPTION.........................43
OPERATION...........................44
RESTRAINTS
DESCRIPTION
This vehicle is equipped with a Frontal Impact Air-
bag System, which utilizes the driver/passenger air-
bags, two front impact sensors, and seat belt
tensioners located in the front seat belt buckles. This
system is designed to protect occupants in the event
of a front impact collision. These airbags are all ser-
viceable parts. The tensioners are integral to the
front seat belt buckles. If these pyrotechnics are
deployed or defective, they must be replaced.
Vehicles equipped with the Side Impact Airbag
System utilize a curtain airbag, three side impact
sensors, and the Occupant Restraint Controller
(ORC) to determine if the airbag should be deployed.
Following a side impact event where the side airbag
was deployed, the headliner as well as the curtain
airbag must be replaced.
The occupant restraints include both active and
passive types. Active restraints are those which
require the vehicle occupants to take some action to
employ, such as fastening a seat belt; while passive
restraints require no action by the vehicle occupants
to be employed.
ACTIVE RESTRAINTS
The active restraints include:
²Front Seat Belts- Both front seating positions
are equipped with three-point seat belt systems
employing a lower B-pillar mounted inertia latch-
type retractor, height-adjustable upper B-pillar
mounted turning loops, a fixed lower seat belt anchor
secured to the lower B-pillar, and a traveling end-re-
lease buckle secured to the inboard side of the seat
cushion frame. The driver side front seat belt buckle
includes an integral Hall-effect seat belt switch that
detects whether the driver side front seat belt has
been fastened.²Rear Seat Belts- Both outboard rear second
and third seating positions are equipped with three-
point seat belt systems. The outboard seating posi-
tion belts employ a lower C or D-pillar mounted
inertia latch-type retractor, a fixed position upper C
or D-pillar mounted turning loop, and a fixed lower
seat belt anchor secured to the inboard side of the
seat cushion frame.
²Child Restraint Anchors- Also equipped in
this vehicle are two, fixed-position, child seat upper
tether anchors located on the lower seat cushion, in
the rear of the lower seat cushion. There is one
anchor integral to the back of the third row seat back
panel, one on each seat back panel. Two lower second
row anchors are also provided for each rear outboard
seating position. The lower anchors are integral to
the seat cushion frame and are accessed from the
front of the second row seat where the seat back
meets the seat cushion.
PASSIVE RESTRAINTS
The passive restraints available for this model
include the following:
²Dual Front Airbags- Multistage driver. front
passenger, and driver knee blocker airbags are avail-
able for this model. This airbag system is a passive,
inflatable, Supplemental Restraint System (SRS) and
vehicles with this equipment can be readily identified
by the ªSRS - AIRBAGº logo molded into the driver
airbag trim cover in the center of the steering wheel
and also into the passenger airbag door on the
instrument panel above the glove box. Vehicles with
the airbag system can also be identified by the airbag
indicator, which will illuminate in the instrument
cluster for about seven seconds as a bulb test each
time the ignition switch is turned to the ON position.
A pyrotechnic-type seat belt tensioner is integral to
the driver and passenger front seat belt buckle of all
models equipped with dual front airbags.
8O - 2 RESTRAINTSRS

²Occupant Classification System- These
vehicles also include an Occupant Classification Sys-
tem (OCS) with components that are located on or in
the passenger front seat cushion. These components
include an Occupant Classification Module (OCM)
and a seat weight bladder and pressure sensor
assembly. In addition, this system includes a belt
tension sensor integral to the lower anchor of the
passenger side front seat belt. Vehicles equipped with
the OCS can be readily identified by a Passenger Air-
bag Disabled (PAD) indicator (Fig. 1) located in the
center stack on the instrument panel above HVAC
control head and radio.
²Curtain Airbags- Curtain airbags are avail-
able for this model when it is also equipped with
dual front airbags. This airbag system is a passive,
inflatable, Supplemental Restraint System (SRS) and
vehicles with this equipment can be readily identified
by a molded identification trim button with the ªSRS
- AIRBAGº logo (Fig. 2) located on the headliner
above each B-pillar.
This vehicle is equipped with a Frontal Impact Air-
bag System, which utilizes the driver/passenger air-
bags, driver knee blocker airbag, and seat belt
tensioners. This system is designed to protect occu-
pants in the event of a front impact collision. These
airbags and seat belt tensioners are all serviceable
parts. If these pyrotechnics are deployed or defective,
they must be replaced, as well as the OccupantRestraint Controller (ORC) must be diagnosed follow-
ing procedures outlined in the diagnostic information.
The Driver and Passenger Airbag System was
designed to reduce the likelihood of injury or death
in frontal collisions. Each separate system is supple-
mental (Fig. 2) orPassiveto the primary restraint
device, which are the seat belts.
²Airbag Indicator- The airbag indicator is inte-
gral to the Instrument Cluster, which is located on
the instrument panel in front of the driver.
²Belt Tension Sensor- Vehicles equipped with
the Occupant Classification System (OCS) include a
belt tension sensor. This sensor is integral to the pas-
senger side front seat belt lower anchor which is
secured to the floor, out board and rear of the front
passenger seat. -.....concealed beneath an access cover
on the seat belt assembly.
²Clockspring- The clockspring is located near
the top of the steering column, directly beneath the
steering wheel (Fig. 3).
²Curtain Airbag- A side curtain airbag is
located on each inside roof side rail above the head-
liner, and extends from the A-pillar to just beyond
the D-pillar.
²Driver Airbag- The driver airbag is located in
the center of the steering wheel, beneath the driver
airbag trim cover (Fig. 3).
²Front Impact Sensor- Two front impact sen-
sors are used on vehicles equipped with dual front
airbags, one left side and one right side. The sensors
are located on the rail tips, rearward of the bumper
attachments.
²Knee Blocker Airbag- The driver knee blocker
airbag is secured to the instrument panel behind the
steering column opening cover (Fig. 3).
Fig. 1 PAD INDICATOR
Fig. 2 SRS LOGO
Fig. 3 AIRBAG COMPONENT LOCATION -
INSTRUMENT PANEL
1 - DRIVER AIRBAG
2 - PASSENGER AIRBAG DISABLED (PAD) INDICATOR
3 - PASSENGER AIRBAG
4 - OCCUPANT RESTRAINT CONTROLLER (ORC)
5 - KNEE BLOCKER AIRBAG
RSRESTRAINTS8O-3
RESTRAINTS (Continued)

²Occupant Classification Module- Vehicles
equipped with the Occupant Classification System
(OCS) include an Occupant Classification Module
(OCM) which is secured to a stamped steel mounting
bracket on the underside of the passenger side front
seat cushion frame.
²Occupant Restraint Controller- The Occu-
pant Restraint Controller (ORC) is also sometimes
referred to as the Airbag Control Module (ACM). The
ORC is located on a mount on the floor transmission
tunnel just underneath the instrument panel center
stack (Fig. 3).
²Passenger Airbag- The passenger airbag is
located on the instrument panel, beneath the instru-
ment panel top pad and above the glove box on the
passenger side of the vehicle (Fig. 3).
²Passenger Airbag Disabled (PAD) Indicator
- Vehicles equipped with the Occupant Classification
System (OCS) include a passenger airbag disabled
(PAD) indicator which is located in the instrument
panel center stack (Fig. 3).
²Passenger Knee Blocker- The passenger knee
blocker is a structural reinforcement that is integral
to and concealed within the glove box door (Fig. 3).
²Seat Belt Tensioner- A seat belt tensioner is
integral to both front seat belt buckles. The seat belt
buckles are secured to the inner seat frame sides,
beneath a cushion trim panel.
²Seat Weight Bladder and Pressure Sensor
Assembly- Vehicles equipped with the Occupant
Classification System (OCS) include a seat weight
bladder that is sandwiched between an insulator pad
on the top of the passenger side front seat pan and
the seat cushion foam padding. A short hose connects
the bladder to a pressure sensor which is secured to
the Occupant Classification Module (OCM) mounting
bracket on the underside of the passenger side front
seat cushion frame.
²Side Impact Sensors- Six side impact sensors
are used on vehicles equipped with the curtain air-
bags, three left side and three right side. The first
row side impact sensor is located in the B-pillar, just
above the front seat belt retractor. The second row
side impact sensor is located in the sliding side door
track opening, just in front of the C-pillar. The third
row side impact sensor is located behind the quarter
trim panel, above the rear tire wheel well, between
the C and D-pillars.
The ORC, the OCM, and the cluster each contain a
microprocessor and programming that allow them to
communicate with each other using the Programma-
ble Communications Interface (PCI) data bus net-
work. This method of communication is used by the
ORC for control of the airbag indicators.OPERATION
ACTIVE RESTRAINTS
The primary passenger restraints in this or any
other vehicle are the seat belts and child restraint
anchors. Seat belts and child restraint anchors are
referred to as an active restraint because the vehicle
occupants are required to physically fasten and prop-
erly adjust these restraints in order to benefit from
them. See the owner's manual in the vehicle glove
box for more information on the features, use and
operation of all of the active restraints.
PASSIVE RESTRAINTS
The passive restraints are referred to as a supple-
mental restraint system because they were designed
and are intended to enhance the protection for the
occupants of the vehicleONLYwhen used in con-
junction with the seat belts. They are referred to as
passive restraints because the vehicle occupants are
not required to do anything to make them operate;
however, the vehicle occupants must be wearing their
seat belts in order to obtain the maximum safety
benefit from the supplemental restraint system.
The supplemental restraint system electrical cir-
cuits are continuously monitored and controlled by a
microprocessor and software contained within the
Occupant Restraint Controller (ORC). An airbag indi-
cator in the ElectroMechanical Instrument Cluster
(EMIC) illuminates for about seven seconds as a bulb
test each time the ignition switch is turned to the
ON or START positions. Following the bulb test, the
airbag indicator is turned ON or OFF by the ORC to
indicate the status of the supplemental restraint sys-
tem. If the airbag indicator comes ON at any time
other than during the bulb test, it indicates that
there is a problem in the supplemental restraint sys-
tem electrical circuits. Such a problem may cause air-
bags not to deploy when required, or to deploy when
not required.
Deployment of the supplemental restraints
depends upon the angle and severity of an impact.
Deployment is not based upon vehicle speed; rather,
deployment is based upon the rate of deceleration as
measured by the forces of gravity (G force) upon the
impact sensors. When an impact is severe enough,
the microprocessor in the ORC signals the inflator of
the appropriate airbag units to deploy their airbag
cushions. The front seat belt tensioners are provided
with a deployment signal by the ORC in conjunction
with the front airbags. During a frontal vehicle
impact, the knee blockers work in concert with prop-
erly fastened and adjusted seat belts to restrain both
the driver and the front seat passenger in the proper
position for an airbag deployment. The knee blockers
also absorb and distribute the crash energy from the
8O - 4 RESTRAINTSRS
RESTRAINTS (Continued)