Chrysler Stratus Convertible. Manual - part 269

The PAB module is mounted to the instrument

panel and pad assembly. The passenger inflator
assembly is within the module housing. The module
is mounted to the instrument panel retainer and sup-
port structure. A protective cover is fitted into the
instrument panel over the airbag module and forms a
decorative cover.

The Passenger Airbag Module (PAB) consists of:
• Inflator assembly

• Reaction canister

• Airbag Pillow

• Deployment door

OPERATION

When supplied with the proper electrical signal the

inflator will produce a gas and discharge it directly
into the cushion.

When supplied with the proper electrical signal,

the inflator produces gas and discharges it directly
into the pillow. The deployment door will hinge,
allowing the pillow to fully inflate.

SEATBELT CONTROL TIMER MODULE (SCTM)

DESCRIPTION

This vehicle uses a convertible structural seatbelt

system. Anchors hold the belt to the seat rather than
the body. Embodied in the belt system is a Retractor-
Integrated Height Adjuster. The purpose of the
height Adjuster is to accommodate a wide range of
occupant sizes.

The SCTM is mounted near the center of the vehi-

cle. A G-sensor is located inside the module.

OPERATION

This belt system attaches to a reclinable seat back

so the traditional locking pendulum mechanism
would not provide security. A solenoid was designed
to lock the belt and was made part of each of the
retractor mechanisms to each seat back. An impact
sensor deactivates the solenoids. The impact sensor
is a component of the Seatbelt Control Timer Module
(SCTM) located under the center console.

The G-sensor is sensitive to frontal impact and to a

roll or pitch or more than 45 degrees and to acceler-
ation or deceleration equal to or greater than 0.7G in
any direction.

STRUCTURAL SEAT BELT SYSTEM

DESCRIPTION

The structural seat with integrated Retractor Inte-

grated Height Adjuster allows the seat belts to com-
fortably fit a large range of occupants. The seat belts
are attached to the seat instead of the body, this
allows better passenger access to the rear seat.

OPERATION

Since the retractor is mounted on a seat back that

can recline, a typical seat belt g-sensor cannot be
used in the retractor. Instead, a solenoid inside the
retractor is used to lock and unlock the seat belt
when electrically signaled by a remote g-sensor. The
remote g-sensor is located inside the Seat belt Con-
trol Timer Module (SCTM). The SCTM is located
under the center console. The seat belt retractor sole-
noid is located in the seat back and is serviced as a
assembly. The removal procedures are located in
Group 23, Body.

When the solenoids are powered, the seat belt can

be moved. When the solenoids are not powered, the
seat belts can not be extracted. This is necessary to
ensure that occupants are always safe, even in the
case of a power loss during an accident. Whether the
seat belts are in lock or unlock position, an occupant
can always release the seat belt and it will retract.

The Seat Belt Control Timer Module controls the

power to the seat belt solenoids. It supplies power
continuously to the seat belts whenever the ignition
key is in the RUN or ACCESSORY position. The
module has two other unique functions: that of a
timer and a g-sensor.

The Seat Belt Control Timer Module was designed

with a timer function so that when the vehicle is not
in use, the battery would not be prematurely
drained. The module times out after approximately
30 minutes if no inputs are send to the module. The
module will power the seat belts for a set period of
time when there is a input:

• Either door ajar switch (open or closed)

Fig. 5 Seatbelt Control Timer Module (SCTM)

Location

1 – SEATBELT CONTROL TIMER MODULE

PASSIVE RESTRAINT SYSTEMS

8M - 3

DESCRIPTION AND OPERATION (Continued)

• Ignition switch moved from RUN or ACCES-

SARY to the OFF position.

Each time one of these input occurs, the timer is

reset to keep the belts powered for 30 minutes.

The G-Sensor function of the Seat Belt Control

Timer Module will cut power to the seat belt when-
ever:

• The vehicle accelerates or decelerates at a rate

greater than or equal to 0.7g in any direction.

• The vehicle is tilted to an angle greater than or

equal to 45 degrees.

Input of ignition switch in the RUN or ACCES-

SORY position will cause the module to power the
seat belts as long as the condition exists.

The SCTM incorporates limited diagnostics. The

detectable faults include solenoid shorted to ground,
open or shorted to battery, internal fault, or no accel-
eration within the past 10 timer cycles. Faults are
communicated to the seatbelt lamp via a single fault
line to another module. The other module communi-
cates the fault on the bus to the cluster/lamp.

DIAGNOSIS AND TESTING

AIRBAG SYSTEM TEST

(1) Connect the DRB lll

t scan tool to the Data

Link connector which is located on the left side kick
panel just above the hood release.

(2) Turn the ignition key to the ON position. Exit

vehicle with the scan tool.

(3) After checking that no one is inside the vehicle,

connect the battery negative remote terminal.

(4) Using the scan tool, read and record the active

Diagnostic Trouble Code (DTC) data.

(5) Read and record any stored DTC’s.
(6) Refer to the proper Body Diagnostic Procedures

Manual if any DTC’s are found in Step 4 and Step 5.

(7) Erase stored DTC’s if there are no active codes.

If problems remain, DTC’s will not erase. Refer to
the proper Body Diagnostic Procedures Manual to
diagnose the problem. If the airbag warning lamp
either fails to light, or goes on and stays on, there is
a system malfunction. Refer to the proper Body Diag-
nostic Procedures Manual to diagnose the problem.
To test the airbag warning lamp operation in the
cluster only, refer to Group 8E, Instrument Panel
and Systems.

SEATBELT CONTROL TIMER MODULE (SCTM)

the Seatbelt Control Timer Module (SCTM) is con-

nected to the Body Control Module (BCM). Problems
with the circuitry (Fig. 6) will be indicated by the
seatbelt warning indicator lamp.

When the G-sensor is at rest, current flows to the

solenoids holding them back. The seatbelt is movable.

When the sensor reacts to the force of impact, it
stops current flow to the solenoids. The solenoids
close in milliseconds locking the seatbelts.

The timer allows current to flow through the sen-

sor and the solenoids for 30 minutes after the igni-
tion

turned

off.

The

30-minute

limit

stops

excessive battery drain while the engine is not run-
ning.

Connected to the Door Ajar switches, the timer

closes the circuit when a door opens, and holds for 30
minutes after the door closes with the ignition off.
This is necessary so the seatbelts can be managed
after the ignition has been off for more than 30 min-
utes. Turning the key to the ACCESSORY, RUN, OR
RUN/START position will also cause the timer to
activate the solenoids.

DIAGNOSTIC MODE

For service purposes on vehilcles equippd with a

SCTM, the 30 minutes can be reduced to 30 seconds
by following this procedure beginning with the igni-
tion OFF, and the driver’s door closed:

• Cycle the ignition switch (key ON-hey OFF)

three times. Then, open and close the drover door
three times.

NOTE: If the vehicle is tilted to a 45 degree angle,
or if it is subjected to acceleration or deceleration
of 0.7G or more in any direction, the G-sensor will
lock the seatbelts.

DETECTABLE FAULTS

The SCTM affords limited diagnostic capability.

Following is a list of detectable faults:

• Solenoid short to ground

• Solenoid Open

• Solenoid short to Battery

• No Acceleration Last Ten Timer Cycles (One

Timer Cycle = Key ON plus 30 minute minimum Key
OFF)

The seatbelts themselves can demonstrate prob-

lems. For example:

• Both Locked all the time

• Both locked with ignition OFF but not timed out

• Both seatbelts function properly when ignition is

ON or passenger door is opened but not when driver
door is opened

• Both seatbelts function properly when ignition is

ON or driver door is opened but not when passenger
door is opened

• Driver seatbelt locked, passenger seatbelt

unlocked

• Passenger seatbelt locked, driver seatbelt

unlocked

8M - 4

PASSIVE RESTRAINT SYSTEMS

DESCRIPTION AND OPERATION (Continued)

These problems can be diagnosed using a DVOM.

Refer to the proper Body Diagnostic Procedures Man-
ual.

STRUCTURAL SEAT BELT SYSTEM
CONDITIONS

Refer to Group 8W, wiring Diagrams for circuit and

pin locations.

Do Not Disconnect or Connect the module

while battery is connected.

NOTE: If SCTM is required to be in the “Sleep”
mode for testing, remove the “Seat Belt” 20 amp
maxi fuse in the PDC for (1) minute. This will alow
the SCTM to time out. Reinstall fuse after (1) minute
to proceed with testing.

Both seat belts locked all the time

Turn the ignition switch to the ACCESSORY posi-

tion to ensure power to the Seat Belt Control Timer
Module is ON and will not time out.

Fig. 6 Seatbelt Control Timer Module System Schematic

1 – BATTERY FEED
2 – PASS SEAT SOL.
3 – DR SEAT SOL.
4 – DR SOL.
5 – PASS SOL.
6 – IGN
7 – RT (PASS) DOOR
8 – LT (DR) DOOR
9 – JUNCTION BLOCK

10 – B. C. M.
11 – DOOR AJAR SWITCHES
12 – LT
13 – RT
14 – TN
15 – IGN. RUN/ACC.
16 – I/C
17 – G SENSOR

PASSIVE RESTRAINT SYSTEMS

8M - 5

DIAGNOSIS AND TESTING (Continued)

(1) Using a voltmeter, check for battery voltage at

Pin 4 and 5 of the Seat Belt Control Timer Module
13 way connector. If no voltage, go to Step 2. If OK,
go to Step 5.

(2) Check fuses:
• Fuse 13 in the Power Distribution Center

• Fuse 15 in the Junction Block

If fuses are OK, go to Step 4. If not OK, replace
fuse(s), if fuse blows again go to Step 3.

(3) Disconnect Seat Belt Control Timer Module

connector and replace fuse, check if fuse blows. If
fuse blows check circuit for shorts to ground between
the module and fuse. If OK, connect module and if
fuse blows check for shorts to ground between the
module and the seat belt solenoid. Repair as neces-
sary.

(4) If voltage is OK, go to Step 5. If no voltage

check for an open circuit between fuse and module.
Repair as necessary.

(5) Check for voltage at the seat belt solenoid con-

nector under the seat. If OK, test solenoid(s). If no
voltage, check for open circuit between the module
and seat belt connector. If OK, replace Seat Belt Con-
trol Timer Module. If not OK, repair as necessary.

Both seat belts locked with the ignition switch in
the OFF position, and SCTM not timed out

With a door open and ensure that the timer has

not timed out.

(1) Using a voltmeter, check for battery voltage at

Pin 5 of the Seat Belt Control Timer Module 13 way
connector. If no voltage, go to Step 2. If OK, go to
Step 5.

(2) Check fuses:
• Fuse 13 in the Power Distribution Center

• Fuse 15 in the Junction Block

If fuses are OK, go to Step 4. If not OK, replace
fuse(s), if fuse blows again go to Step 3.

(3) Disconnect Seat Belt Control Timer Module

(4) If voltage is OK, go to Step 5. If no voltage

check for an open circuit between fuse and module.
Repair as necessary.

(5) Using a ohmmeter check from the module con-

nector, the door ajar switches and circuits for a open
circuit and check for a shorted to ground circuit. If
open or shorted circuit repair as necessary. If OK,
replace Seat Belt Control Timer Module.

Both seat belts lock and unlock with ignition
switch ON or when passenger door ajar switch
activated but not when the driver door ajar switch
is activated.

Using a ohmmeter, check from the module the

driver door ajar switch and circuit for a open circuit
and for a shorted to ground circuit. Check Pin 2 of
the Seat Belt Control Timer Module to ground for
continuity. If not OK, check for open or shorted cir-
cuit and repair as necessary or replace the door ajar
switch. If OK, replace Seat Belt Control Timer Mod-
ule. System will function improperly only from
affected door.

Both seat belts lock and unlock with ignition
switch ON or when driver door ajar switch
activated but not when the passenger door ajar
switch is activated.

Using a ohmmeter check from the module the pas-

senger door ajar switch and circuit for a open or
shorted circuit. Check Pin 3 of the Seat Belt Control
Timer Module to ground for continuity. If not OK,
check for open or shorted circuit and repair as neces-
sary or replace the door ajar switch. If OK, replace
Seat Belt Control Timer Module. System will func-
tion improperly only from affected door.

Driver seat belt locked, passenger seat belt
unlock.

Using a ohmmeter, check the seat belt solenoid

from Pin 7 of the Seat Belt Control Timer Module to
ground for a reading of 50 to 60 ohms. If OK, replace
Seat Belt Control Timer Module. If not OK, check for
open or shorted ground circuit and repair as neces-
sary or replace the seat belt retractor if the open or
shorted circuit is in the solenoid.

Passenger seat belt locked, driver seat belt
unlock.

Using a ohmmeter, check the seat belt solenoid

from Pin 8 of the Seat Belt Control Timer Module to
ground for a reading of 50 to 60 ohms. If OK, replace
Seat Belt Control Timer Module. If not OK, check for
open or shorted circuit and repair as necessary or
replace the seat belt retractor if the open or shorted
circuit is in the solenoid.

8M - 6

PASSIVE RESTRAINT SYSTEMS

DIAGNOSIS AND TESTING (Continued)

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