Grand Cherokee 4WD V8-4.7L (2003)
Impact Sensor: Service and Repair
Front Impact Sensor & Bracket
FRONT IMPACT SENSOR & BRACKET
The front and side impact sensors are interchangeable except that the front impact sensors are serviced with a right or left mounting bracket, while the
side impact sensors use no mounting bracket. If a front impact sensor is faulty, but not damaged, the sensor may be removed from the sensor mounting
bracket and replaced with a side impact sensor. If the front impact sensor or the sensor mounting bracket are damaged in any way, or if proper
tightening torque of the screws that secure the sensor to the bracket cannot be achieved, the front impact sensor and bracket must be replaced as a unit.
WARNING:
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ON VEHICLES EQUIPPED WITH AIRBAGS, DISABLE THE SUPPLEMENTAL RESTRAINT SYSTEM BEFORE ATTEMPTING
ANY STEERING WHEEL, STEERING COLUMN, DRIVER AIRBAG, PASSENGER AIRBAG, FRONT IMPACT SENSOR, SIDE
IMPACT SENSOR, SIDE CURTAIN AIRBAG, 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 AND POSSIBLE PERSONAL INJURY.
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THE FRONT IMPACT SENSOR ENABLES THE SYSTEM TO DEPLOY THE FRONT SUPPLEMENTAL RESTRAINTS. NEVER
STRIKE OR DROP THE FRONT IMPACT SENSOR, AS IT CAN DAMAGE THE IMPACT SENSOR OR AFFECT ITS
CALIBRATION. 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, INCOMPLETE, OR IMPROPER FRONT SUPPLEMENTAL RESTRAINT DEPLOYMENT AND POSSIBLE
OCCUPANT INJURIES.
REMOVAL
1. Disconnect and isolate the battery negative cable. Wait two minutes for the system capacitor to discharge before hirther service.
2. Remove the headlamp mounting module from the front of the vehicle.
3. Disconnect the right or left headlamp and dash wire harness connector for the front impact sensor from the sensor connector receptacle.
Fig. 28 Front Impact Sensor & B Remove/Install
4. Remove the three screws that secure the right or left front impact sensor and bracket unit to the right or left radiator support vertical member.
5. Remove the right or left front impact sensor and bracket unit from the front of the vehicle.
INSTALLATION
1. Position the right or left front impact sensor and bracket unit to the front of the vehicle.
2. Position the right or left front impact sensor and bracket unit to the right or left radiator support vertical member.
3. Loosely install the three screws that secure the right or left front impact sensor and bracket unit right or left radiator support vertical member.
4. For the right impact sensor and bracket unit, the tightening sequence for the three screws that secure it to the right radiator support vertical member
is from top to bottom. For the left impact sensor and bracket unit, the tightening sequence for the three screws that secure it to the left radiator