DESCRIPTION & OPERATION
| WARNING | Accidental air bag deployment is possible. Personal injury may result. To avoid accidental air bag deployment or injury, read and carefully follow all WARNINGS and AIR BAG SAFETY PRECAUTIONS . |
Supplemental Inflatable Restraint (SIR) system is designed to supplement protection provided by driver-side and passenger-side seat belts. A frontal collision of sufficient force will deploy driver-side and passenger-side air bags modules. Steering column and knee bolsters also absorb collision energy.
SIR system consists of Sensing and Diagnostic Module (SDM), driver-side and passenger-side air bag modules, passenger-side air bag disable switch, SIR coil assembly and AIR BAG warning light. A front end discriminating sensor is used 1500 and 2500 series trucks. An Electronic Frontal Sensor (EFS) is used on 3500 series trucks.
SYSTEM OPERATION CHECK
If SIR system is functioning normally, AIR BAG warning light flashes 7 times and then turns off when ignition is turned on. System malfunction is indicated when light does not illuminate at all, light comes on while vehicle is driven, light flashes 7 times and remains on or light does not flash but remains on when ignition is turned on.
CONNECTOR IDENTIFICATION
Note. Refer to illustrations to identify SIR connector terminals. (Scheme 55)- (Scheme 59).
