Air Bag Supplemental Restraint System (SRS)

The air bag Supplemental Restraint System (SRS) is designed to provide increased collision protection for front seat occupants in addition to that provided by the three-point safety belt system. Safety belt use is necessary to obtain the best occupant protection and to receive the full advantages of the SRS.







The air bag Supplemental Restraint System (SRS) components are shown in the above illustration.







Air Bag Module - Driver
The driver air bag module:
^ is installed new as an assembly.
^ is mounted in the center of the steering wheel.

Air Bag Sliding Contact
The air bag sliding contact:
^ is mounted on the steering column, behind the steering wheel.
^ allows uninterrupted electrical connection between the driver air bag module and the Restraints Control Module (RCM).







Air Bag Module - Passenger
The passenger air bag module:
^ is installed new as an assembly.
^ is mounted in the RH side of the instrument panel.

Passenger Air Bag Deactivation (PAD) Switch
The Passenger Air Bag Deactivation (PAD) switch:
^ is located on the LH side of the instrument panel ash receptacle.
^ contains a Light Emitting Diode (LED) that indicates when the PAD switch is activated (air bag disabled).
^ allows the passenger air bag deployment circuit to be disabled using the ignition key.
^ should be used whenever a child safety seat is being used in the front passenger seating position.

Restraints Control Module (RCM)
The Restraints Control Module (RCM) performs the following functions:
^ signals the inflators to deploy the air bags in the event of a deployable crash.
^ monitors the air bag Supplemental Restraint System (SRS) for faults.
^ illuminates the air bag indicator if a fault is detected.
^ flashes the air bag indicator to indicate the Lamp Fault Code (LFC) is detected.
^ communicates through the Data Link Connector (DLC) the current or historical Diagnostic Trouble Codes (DTCs).
^ signals the Generic Electronic Module (GEM) to activate a chime if the air bag indicator is not available and another SRS fault exists.

NOTE: The safing sensor is internal to the RCM and is not serviced separately.

The RCM monitors the SRS for possible faults. If a fault is detected while the ignition switch is in the RUN position, the RCM will illuminate the air bag indicator located in the instrument cluster.

When the ignition is cycled (turned OFF and then ON), the air bag indicator will remain lit for six seconds and then go out for two seconds. If an SRS fault exists, the air bag indicator will then flash a two-digit Lamp Fault Code (LFC). The air bag indicator will flash the LFC five times, then it will remain illuminated for the rest of the key cycle. The RCM will also communicate the current and historical DTCs through the Data Link Connector (DLC), using a scan tool. If the air bag indicator does not function, and a system fault is detected, the RCM will signal the GEM to activate an audible chime. The chime is a series of five sets of five tone bursts. If the chime is heard, the SRS and the air bag indicator require repair.

LFCs are prioritized. If two or more faults occur at the same time, the fault having the highest priority will be displayed. After that fault has been corrected, the next highest priority fault will be displayed.

The RCM includes a backup power supply. This feature provides sufficient backup power to deploy the air bags in the event that the ignition circuit is damaged in a collision before the safing and air bag sensors determine that a deployment is required. The backup power supply will deplete its stored energy approximately one minute after the battery ground cable is disconnected.

Electrical System
The electrical system that supports the air bag Supplemental Restraint System (SRS):
^ is powered from the battery through the ignition circuit.
^ provides the electrical path from the Restraints Control Module (RCM) to the air bag modules.
^ provides the electrical path from the RCM to the air bag indicator.
^ provides the electrical path from the RCM to the Data Link Connector (DLC).
^ provides the electrical path from the RCM to the generic electronic module.

Sensor

WARNING: THE RESTRAINTS CONTROL MODULE (RCM) ORIENTATION IS CRITICAL FOR CORRECT SYSTEM OPERATION. IF A VEHICLE EQUIPPED WITH AN AIR BAG SUPPLEMENTAL RESTRAINT SYSTEM (SRS) HAS BEEN INVOLVED IN A COLLISION IN WHICH THE CENTER TUNNEL AREA HAS BEEN DAMAGED, INSPECT THE MOUNTING AND BRACKET FOR DEFORMATION. IF DAMAGED, THE RCM MUST BE INSTALLED NEW WHETHER OR NOT THE AIR BAGS HAVE DEPLOYED. IN ADDITION, MAKE SURE THE AREA OF THE RCM MOUNTING IS RESTORED TO ITS ORIGINAL CONDITION.

The SRS contains two sensors which are integral to the RCM. The RCM is mounted on the center tunnel under the instrument panel.