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Home >> Ford >> 2009 >> Flex Limited, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System >> Diagnosis And Testing >> Air Bag and Safety Belt Pretensioner Supplemental Restraint System (SRS) >> Principles of Operation >> Impact Sensors

Impact Sensors

WARNING: If a vehicle has been in a crash, inspect the restraints control module (RCM) and the impact sensor (if equipped) mounting areas for deformation. If damaged, restore the mounting areas to the original production configuration. A new RCM and sensors must be installed whether or not the air bags have deployed. Failure to follow these instructions may result in serious personal injury or death in a crash.

The impact sensors provide data to the RCM  for use in calculating impact severity. This is accomplished using various electrical sensors located throughout the vehicle.

For these vehicles, the SRS  employs up to 7 impact sensors. One of the sensors is integral to the RCM  and is not separately serviceable. The RCM  is mounted on the center tunnel between the front seats. There are 2 front impact severity sensors located in the front-center of the vehicle, behind the grille. In addition, there are 4 side impact sensors. The first row side impact sensors are located in each of the front doors behind the trim panel, the second row side sensors are located on or near the base of the C-pillar. Mounting orientation is critical for correct operation of all impact sensors.

The side impact sensors are not  interchangeable between the first and second row.