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A Passive Restraint Control Module (PRCM) generally is usually a electronic

component that activates a passive restraint such as air bags or automatic

shoulder belts.

For example, the PRCM in some models of Mercury Villager activates the front shoulder belt drive. When the ignition switch is turned on and the door is closed the door latch switch closes which signals the PRCM to activate the shoulder belt driver to move the shoulder belt buckle carriage from the front to the rear position. When the door is opened the door latch switch opens which causes the PRCM to activate the shoulder belt drive to move the shoulder belt drive carriage from the rear to the front position.

Repair of PRCMs is generally not recommended for many reasons. Most are

not repairable, and the consequences of a faulty repair could be fatal. In some

cases a PRCM can be replaced by an experienced mechanic or automotive

electronics technician with common shop tools.

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