Jeep Liberty KJ. Manual — part 243
OPERATION
FRONT
The front impact sensors are electronic accelerometers that sense the rate of vehicle deceleration, which provides
verification of the direction and severity of an impact. Each sensor also contains an electronic communication chip
that allows the unit to communicate the sensor status as well as sensor fault information to the microprocessor in
the Airbag Control Module (ACM).
The ACM microprocessor continuously monitors all of the passive restraint system electrical circuits to determine the
system readiness. If the ACM detects a monitored system fault, it sets a Diagnostic Trouble Code (DTC) and con-
trols the airbag indicator operation accordingly. The impact sensors each receive battery current and ground through
dedicated left and right sensor plus and minus circuits from the ACM. The impact sensors and the ACM communi-
cate by modulating the voltage in the sensor plus circuit.
The hard wired circuits between the front impact sensors and the ACM may be diagnosed and tested using con-
ventional diagnostic tools and procedures. However, conventional diagnostic methods will not prove conclusive in
the diagnosis of the ACM, the impact sensors, or the electronic message inputs to or outputs from the impact sen-
sors. The most reliable, efficient, and accurate means to diagnose the impact sensors, the ACM, and the electronic
message communication between the sensors and the ACM requires the use of a diagnostic scan tool. Refer to the
appropriate diagnostic information.
SIDE
The side impact sensors are electronic accelerometers that sense the rate of vehicle deceleration, which provides
verification of the direction and severity of an impact. Each sensor also contains an electronic communication chip
that allows the unit to communicate the sensor status as well as sensor fault information to the microprocessor in
the Airbag Control Module (ACM).
The ACM microprocessor continuously monitors all of the side passive restraint system electrical circuits to deter-
mine the system readiness. If the ACM detects a monitored system fault, it sets a Diagnostic Trouble Code (DTC)
and controls the airbag indicator operation accordingly. The impact sensors each receive battery current and ground
through dedicated left and right sensor plus and minus circuits from the ACM. The impact sensors and the ACM
communicate by modulating the voltage in the sensor plus circuit.
The hard wired circuits between the side impact sensors and the ACM may be diagnosed and tested using con-
ventional diagnostic tools and procedures. However, conventional diagnostic methods will not prove conclusive in
the diagnosis of the ACM, the impact sensors, or the electronic message inputs to or outputs from the impact sen-
sors. The most reliable, efficient, and accurate means to diagnose the impact sensors, the ACM, and the electronic
message communication between the sensors and the ACM requires the use of a diagnostic scan tool. Refer to the
appropriate diagnostic information.
REMOVAL
FRONT
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, never strike or drop the front impact sensor, as it can damage
the impact sensor or affect its calibration. The front impact sensor enables the system to deploy the front
supplemental restraints. If an impact sensor is accidentally dropped during service, the sensor must be
scrapped and replaced with a new unit. Failure to observe this warning could result in accidental, incom-
plete, or improper front supplemental restraint deployment.
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RESTRAINTS - SERVICE INFORMATION
KJ
1. Disconnect and isolate the battery negative cable.
Wait two minutes for the system capacitor to dis-
charge before further service.
2. Remove the screw (3) that secures the right or left
front impact sensor (2) to the back of the right or
left radiator support vertical member (1).
3. Disconnect the headlamp and dash wire harness
connector for the front impact sensor from the sen-
sor connector receptacle.
4. Remove the right or left front impact sensor from
the engine compartment.
SIDE
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, never strike or drop the side impact sensor, as it can damage
the impact sensor or affect its calibration. The side impact sensor enables the system to deploy the side
curtain supplemental restraints. If an impact sensor is accidentally dropped during service, the sensor must
be scrapped and replaced with a new unit. Failure to observe this warning could result in accidental, incom-
plete, or improper side supplemental restraint deployment.
1. Adjust the driver or passenger side front seat to its
most forward position for easiest access to the
B-pillar trim.
2. Disconnect and isolate the battery negative cable.
Wait two minutes for the system capacitor to dis-
charge before further service.
3. Remove the lower trim from the inside of the right
or left B-pillar (1). (Refer to 23 - BODY/INTERIOR/
B-PILLAR LOWER TRIM - REMOVAL).
4. Remove the screw (3) that secures the right or left
side impact sensor (2) to the lower B-pillar.
5. Disconnect the body wire harness connector (4) for
the side impact sensor from the sensor connector
receptacle.
6. Remove the right or left side impact sensor from
the passenger compartment.
KJ
RESTRAINTS - SERVICE INFORMATION
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INSTALLATION
FRONT
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, never strike or drop the front impact sensor, as it can damage
the impact sensor or affect its calibration. The front impact sensor enables the system to deploy the front
supplemental restraints. If an impact sensor is accidentally dropped during service, the sensor must be
scrapped and replaced with a new unit. Failure to observe this warning could result in accidental, incom-
plete, or improper front supplemental restraint deployment.
1. Position the right or left front impact sensor (2) into
the engine compartment.
2. Reconnect the headlamp and dash wire harness
connector for the front impact sensor to the sensor
connector receptacle.
3. Position the sensor onto the back of the right or left
radiator support vertical member (1). Be certain
that the anti-rotation pin on the back of the sensor
is engaged in the lower clearance hole of the radi-
ator support.
4. Install and tighten the screw (3) that secures the
sensor to the back of the support vertical member.
Tighten the screw to 7 N·m (65 in. lbs.).
5. Do not reconnect the battery negative cable at this
time. The supplemental restraint system verification
test procedure should be performed following service of any supplemental restraint system component. (Refer to
8 - ELECTRICAL/RESTRAINTS - STANDARD PROCEDURE - VERIFICATION TEST).
SIDE
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, never strike or drop the side impact sensor, as it can damage
the impact sensor or affect its calibration. The side impact sensor enables the system to deploy the side
curtain supplemental restraints. If an impact sensor is accidentally dropped during service, the sensor must
be scrapped and replaced with a new unit. Failure to observe this warning could result in accidental, incom-
plete, or improper side supplemental restraint deployment.
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RESTRAINTS - SERVICE INFORMATION
KJ
1. Position the right or left side impact sensor (2) near
the lower B-pillar (1) in the passenger compart-
ment.
2. Reconnect the body wire harness connector (4) for
the side impact sensor to the sensor connector
receptacle.
3. Position the right or left side impact sensor onto
the inner B-pillar. Be certain that the anti-rotation
pin on the back of the sensor is engaged in the
clearance hole of the B-pillar.
4. Install and tighten the screw (3) that secures the
right or left side impact sensor to the inner B-pillar.
Tighten the screw to 11 N·m (100 in. lbs.).
5. Reinstall the lower trim onto the inside of the B-pil-
lar. (Refer to 23 - BODY/INTERIOR/B-PILLAR
LOWER TRIM - INSTALLATION).
6. Do not reconnect the battery negative cable at this time. The supplemental restraint system verification test pro-
cedure should be performed following service of any supplemental restraint system component. (Refer to 8 -
ELECTRICAL/RESTRAINTS - STANDARD PROCEDURE - VERIFICATION TEST).
KJ
RESTRAINTS - SERVICE INFORMATION
8O - 281
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