Seat Belt Module

NOTE: Seat belt control module may also be referred to as passive restraint module.

The seat belt control module looks at the front door jamb switches, vehicle speed, belt retractor switches, travelling tab position switches and ignition switch to operate the system. After looking at all the inputs, the module then independently operates each track assembly through the front motor and rear motor relays of each track assembly.

The rate of speed sensor deceleration will prevent the carriers from being moved forward in case the doors open or the door switch circuits close to ground in an impact. The speed sensor signal rate overrides the door jamb switch to keep the restraints on. The belts would eventually be released by the seat belt control module after its internal timer function is satisfied that the vehicle is truly stopped. The time interval varies with the deceleration rate seen by the seat belt module through the speed sensor signal.

There are two power supplies for the seat belt control module. Fuse No. 19 (20-amp) supplies power all the time and fuse No. 10 (20-amp) supplies power with the ignition on. The maximum current draw for the module with the doors closed and the track motors off is one milliamp. With the ignition off and a door switch exit signal the module will energize the applicable front motor relay for 14 seconds to move the tab and belt forward. After 14 seconds, the module should go back to the dormant ignition off state. The module gets one ground through the passive restraint module connector cavity No. 1 (Black wire).