Jeep Liberty KJ. Manual - part 251

SEAT BELT TURNING LOOP ADJUSTER

REMOVAL

WARNING: To avoid personal injury or death, on vehicles equipped with airbags, disable the supplemental
restraint system before attempting any steering wheel, steering column, airbag, occupant classification sys-
tem, seat belt tensioner, impact sensor, or instrument panel component diagnosis or service. Disconnect
and isolate the battery negative (ground) cable, then wait two minutes for the system capacitor to discharge
before performing further diagnosis or service. This is the only sure way to disable the supplemental
restraint system. Failure to take the proper precautions could result in accidental airbag deployment.

WARNING: To avoid personal injury or death, during and following any seat belt or child restraint anchor
service, carefully inspect all seat belts, buckles, mounting hardware, retractors, tether straps, and anchors
for proper installation, operation, or damage. Replace any belt that is cut, frayed, or torn. Straighten any
belt that is twisted. Tighten any loose fasteners. Replace any belt that has a damaged or inoperative buckle
or retractor. Replace any belt that has a bent or damaged latch plate or anchor plate. Replace any child
restraint anchor or the unit to which the anchor is integral that has been bent or damaged. Never attempt to
repair a seat belt or child restraint component. Always replace damaged or faulty seat belt and child
restraint components with the correct, new and unused replacement parts listed in the DaimlerChrysler
Mopar Parts Catalog.

1. Disconnect and isolate the battery negative cable.

Wait two minutes for the system capacitor to dis-
charge before further service.

2. Unsnap and lift the trim cover to access the nut

that secures the front seat belt turning loop to the
height adjuster on the upper B-pillar.

3. Remove the nut that secures the seat belt turning

loop to the height adjuster stud on the upper B-pil-
lar.

4. Remove the seat belt turning loop from the height

adjuster stud.

5. Remove the upper trim from the inside of the B-pil-

lar. (Refer to 23 - BODY/INTERIOR/B-PILLAR
UPPER TRIM - REMOVAL).

6. Remove the screw (1) that secures the seat belt

turning loop adjuster (3) to the upper B-pillar (2).

7. Pull the upper end of the turning loop adjuster away from the B-pillar far enough to disengage the hooks on the

lower end of the adjuster from the slots in the B-pillar.

8. Remove the seat belt turning loop adjuster from the B-pillar.

INSTALLATION

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RESTRAINTS - SERVICE INFORMATION

1. Position the seat belt turning loop adjuster (3) to

the B-pillar (2).

2. Engage the hooks on the lower end of the adjuster

into the slots in the B-pillar.

3. Tilt the upper end of the turning loop adjuster up

into position against the B-pillar.

4. Install and tighten the screw (1) that secures the

seat belt turning loop adjuster to the upper B-pillar.
Tighten the screw to 34 N·m (25 ft. lbs.).

5. Reinstall the upper trim onto the inside of the B-pil-

lar. (Refer to 23 - BODY/INTERIOR/B-PILLAR
UPPER TRIM - INSTALLATION).

6. Position the seat belt turning loop onto the height

adjuster stud on the upper B-pillar.

7. Install and tighten the nut that secures the seat belt

turning loop to the height adjuster stud. Tighten the nut to 34 N·m (25 ft. lbs.).

8. Fold and snap the trim cover back into place to conceal the nut that secures the front seat belt turning loop to

the height adjuster on the upper B-pillar.

9. Reconnect the battery negative cable.

RESTRAINTS - SERVICE INFORMATION

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SEAT WEIGHT SENSOR

DESCRIPTION

Vehicles equipped with the Occupant Classification
System (OCS) have a seat weight bladder (2) and
pressure sensor (5) unit that is integral to the passen-
ger side front seat cushion. The bladder is sandwiched
between the seat cushion springs and seat cushion
foam. A heavy jute-like insulator pad (3) is installed
between the lower surface of the bladder and the seat
cushion springs. The pad is secured to the underside
of the bladder by diagonal straps that form pockets at
each of the two rear corners of the bladder, while two
plastic push-in fasteners (1) locate and secure the for-
ward edge of the bladder and the pad to the front
edge of the seat cushion frame. The seat cushion
foam is installed loosely over the top of the bladder,
then secured by the installation of the trim cover to the
seat cushion.

The bladder consists of two rectangular sheets of an elastomeric material and a molded plastic elbow fitting. The
two sheets of material are sealed together around their perimeter and heat staked to each other at numerous reg-
ular points within their field. The elbow fitting is sealed to a small round hole in the lower surface of the bladder and
is pointed downward where it passes through a clearance hole in the insulator pad and extends to just below the
seat cushion springs. Then the bladder is filled with a silicone fluid to become a pliable, quilted membrane.

Under the seat cushion a short tube (4) is securely clamped at one end to the bladder nipple, and at the other end
to a nipple on the electronic pressure sensor. The pressure sensor is contained within a molded plastic housing with
an integral nipple formation near one end and an integral electrical connector receptacle at the opposite end. The
sensor housing also features an integral mount that snaps over a tab integral to the stamped steel Occupant Clas-
sification Module (OCM) mounting bracket welded to the underside of the passenger side front seat cushion frame.
The pressure sensor connector receptacle contains terminal pins that connect the sensor to the vehicle electrical
system and the OCM through a dedicated take out and connector of the passenger side front seat wire harness.

The seat weight bladder and pressure sensor cannot be adjusted or repaired. The components of the passenger
side front seat cushion of a vehicle equipped with the OCS including the cushion frame, springs, insulator pad, seat
weight bladder and pressure sensor, seat cushion foam, wire harness and the OCM are serviced only as a factory-
calibrated, assembled and tamper-evident unit. Only the OCM and the seat cushion trim are available for separate
service replacement. Once a service replacement package has been installed in a vehicle, the OCM can thereafter
be serviced only by replacing the entire passenger side front seat cushion unit with another complete service
replacement package.

OPERATION

The seat weight bladder and pressure sensor unit is designed to sense the relative weight of a load applied to the
passenger side front seat cushion, which provides a logic input to the microprocessor of the Occupant Classification
Module (OCM). When a load is applied to the seat cushion, fluid within the bladder becomes pressurized. These
changes in bladder fluid pressure are measured by the pressure sensor under the seat cushion through the bladder
tube. As the pressure within the bladder changes, the circuitry of the pressure sensor changes the output voltage of
the sensor.

The pressure sensor receives a nominal five volts and a ground through dedicated hard wired circuits from the
OCM. The OCM then monitors the pressure sensor output voltage on a dedicated hard wired data communication
circuit. The hard wired circuits between the pressure sensor and the OCM may be diagnosed and tested using
conventional diagnostic tools and procedures. However, the most reliable, efficient, and accurate means to diagnose
the bladder and pressure sensor input to the OCM, and the electronic message communication between the OCM
and the Airbag Control Module (ACM) requires the use of a diagnostic scan tool. Refer to the appropriate diagnostic
information.

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RESTRAINTS - SERVICE INFORMATION

REMOVAL

If any of the Occupant Classification System (OCS) components of the passenger side front seat cushion require
replacement, they are serviced only as a factory-calibrated, assembled, and tamper-evident service replacement
package. This package includes the assembled frame, springs, pad, seat weight bladder and pressure sensor, foam,
wiring and a calibrated Occupant Classification Module (OCM). When installing this package, always replace all of
the existing components with the new components as a unit. Do not attempt to separate or disconnect any of the
new OCS components contained in the service replacement package from each other, and do not attempt to reuse
any of the replaced components in this or any other vehicle.

Once any of the original factory-installed components except the OCM have been replaced with the service replace-
ment package components, the OCM can only be serviced by replacing the entire passenger side front seat cushion
unit with another complete service replacement package. Any time any one of these components is removed or
replaced for any reason, the OCM must be re-calibrated using a diagnostic scan tool, the Occupant Classification
Seat Weight special tool, and the Occupant Classification System Verification Test. Refer to the appropriate diag-
nostic procedures.

WARNING: To avoid personal injury or death on vehicles equipped with the Occupant Classification System
(OCS), only the Occupant Classification Module (OCM) and the seat cushion trim may be serviced sepa-
rately. All other components of the passenger side front seat cushion assembly must be serviced only as a
complete factory-calibrated, assembled and tamper-evident service replacement package. This package
includes the frame, springs, pad, bladder and pressure sensor, foam, wiring and a calibrated OCM. When
installing this package always replace all of the existing components with the new components as a unit.
Do not attempt to separate or disconnect any of the new OCS components in the service replacement pack-
age from each other, and do not attempt to reuse any of the replaced components in this or any other
vehicle. Failure to take the proper precautions could result in failure of the passenger airbag to deploy
when required, or in passenger airbag deployment when not required.

WARNING: To avoid personal injury or death on vehicles equipped with the Occupant Classification System
(OCS), do not modify the front passenger seat assembly or center floor console in any way. Do not use any
prior year, subsequent year, secondary or aftermarket seat trim covers. At no time should any Supplemental
Restraint System (SRS) or OCS component be modified or replaced with any part except those which are
specified for the particular vehicle application in the DaimlerChrysler Mopar Parts Catalog. Failure to
observe these precautions could cause an OCS miscalibration condition, which may result in the passenger
airbag failing to deploy when required or deploying when not required.

CAUTION: On vehicles equipped with the Occupant Classification System (OCS), never replace both the Air-
bag Control Module (ACM) and the Occupant Classification Module (OCM) at the same time. If both require
replacement, replace one. Then perform the supplemental restraint verification test before replacing the
other. Both the ACM and the OCM store OCS calibration data, which they transfer to one another when one
of them is replaced. If both are replaced at the same time, an irreversible fault will be set in both modules.

1. Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before

further service.

2. Remove the passenger side front seat from the vehicle. (Refer to 23 - BODY/SEATS/SEAT - FRONT -

REMOVAL).

3. Remove the seat cushion assembly from the passenger side front seat. (Refer to 23 - BODY/SEATS/SEAT

CUSHION - FRONT - REMOVAL).

4. Remove the trim cover from the passenger side front seat cushion. (Refer to 23 - BODY/SEATS/SEAT CUSHION

COVER - FRONT - REMOVAL).

RESTRAINTS - SERVICE INFORMATION

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