Impact Sensor: Description and Operation

DESCRIPTION

FRONT IMPACT SENSORS






Figure 1 FRONT IMPACT SENSOR

There are two front impact sensors (Figure 1), one on the left, and one on the right front sides of the vehicle. These sensors are mounted remotely from the impact sensor that is internal to the Occupant Restraint Controller (ORC). The right and left front and side impact sensors are identical in construction and calibration and each front impact sensor is secured with two screws. The front impact sensors are secured with two screws to the outboard sides of the right and left front rail tips.


The impact sensor housing has an integral connector and two mounting ears, each with a metal sleeve to provide crush protection. A cavity in the center of the molded black plastic impact sensor housing contains the electronic circuitry of the sensor which includes an electronic communication chip and an electronic impact sensor. Potting material fills the cavity to seal and protect the internal electronic circuitry and components. The front impact sensors are each connected to the vehicle electrical system through the headlamp to dash wire harness.


The front impact sensors cannot be repaired or adjusted and, if damaged or faulty, they must be replaced. If a front impact sensor is faulty, only the sensor needs to be replaced. If the sensor is damaged or faulty, or if proper tightening torque of the screws that secure the sensor to the bracket cannot be achieved, the sensor and bracket must be replaced. Refer to the proper body diagnostic information for diagnosis and testing.


SIDE IMPACT SENSORS






Figure 2 SIDE IMPACT SENSOR

Three side impact sensors (Figure 2) are used on each side of the vehicle. These sensors are mounted remotely from the bi-directional safing sensor that is internal to the Occupant Restraint Controller (ORC). The side and front impact sensors are identical in construction and calibration and each impact sensor is secured with two screws. Each side impact sensor is secured with two screws. The first row side impact sensor is located in the B-pillar, just above the front seat belt retractor (Figure 3). The second row side impact sensor is located in the sliding door opening, in the lower door track area (Figure 3). 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 (Figure 3).






Figure 3 SIDE IMPACT SENSOR LOCATION






The impact sensor housing has an integral connector. A cavity in the center of the molded black plastic impact sensor housing contains the electronic circuitry of the sensor which includes an electronic communication chip and an electronic impact sensor. Potting material fills the cavity to seal and protect the internal electronic circuitry and components. The side impact sensors are each connected to the vehicle electrical system through a connector of the body harness.


The side impact sensors cannot be repaired or adjusted. If damaged or faulty, they must be replaced. Refer to the proper body diagnostic information for diagnosis and testing.