Sensor, SAFING: Description
Electronic Pedestrian Protection (EPP) safing sensors (2) are found only in vehicles equipped with the EPP system (also known as the PedPro or Active Hood System), which is available only in vehicles manufactured for certain export markets. These sensors are mounted at the front of the vehicle to provide a redundant logic input for use by the Electronic Pedestrian Protection Module (EPPM) to confirm inputs from the two outboard EPP impact sensors.
The EPP safing sensors are satellite acceleration-type sensors that are mounted to the inner surface of the front bumper fascia at the front of the vehicle. The two safing sensors are each secured by a nut to a weld stud within a dedicated bracket located just inboard of each front fog lamp on the inside of the front bumper fascia.
Each sensor housing (1) has an integral 4 pin connector receptacle (4), an integral locator pin (3) and an integral mounting hole with a metal sleeve (2) to provide crush protection. A cavity in the center of the molded plastic safing sensor housing contains the electronic circuitry of the sensor which includes an electronic communication chip and an electronic acceleration sensor. Potting material fills the cavity and a translucent molded cover is laser welded over the cavity to seal and protect the internal electronic circuitry and components.
The EPP safing sensors are each connected to the vehicle electrical system through dedicated take outs and connectors of the headlamp and dash wire harness. These acceleration-type safing sensors cannot be repaired or adjusted and, if damaged or ineffective, they must be replaced.