Airbag and Seatbelt Pretensioner Supplemental Restraint System (SRS) - System Operation and

When the ignition is turned ON during normal operation, the IPC illuminates the airbag warning indicator continuously for 6 seconds. If the SRS is free of faults, the airbag warning indicator turns off and remains off. If a SRS fault exists, the airbag warning indicator illuminates and remains illuminated for the rest of the ignition cycle. The RCM communicates with the IPC via the HS-CAN. The IPC illuminates the airbag warning indicator based on messaging from the RCM. The IPC also illuminates the airbag warning indicator if there is no communication between the RCM and IPC.

Event Notification Signal

The event notification feature provides other vehicle subsystems with information pertaining to SRS deployment or fuel cutoff status. When an impact occurs which exceeds a pre-determined threshold, the RCM sends a signal on a dedicated circuit to the BCM.

When the BCM receives the crash signal input, it initiates fuel cutoff to disable the fuel system.

After the fuel system is disabled, the vehicle can be re-started after carrying out the following steps:

a. Turn the ignition ON and wait 10 seconds. b. Turn the ignition OFF. c. Turn the ignition ON. d. Turn the ignition OFF. e. Turn the ignition ON.

Occupant Classification System (OCS)

The OCS classifies the size of the front passenger seat occupant and provides this information to the RCM.

Pressure is applied to the OCS bladder when weight of any occupant or object in the front passenger seat is present. The pressure is then transferred through a tube and sensed by the OCS pressure sensor within the OCSM. The OCSM sends information concerning the weight of any occupant or object on the front passenger seat to the RCM via the HS-CAN. The RCM uses this information when determining if the passenger airbag or side airbag needs to be deployed in the event of a crash.

The OCS is also used for operation of the passenger Belt-Minder®. For information about Belt-Minder®, Refer to: Seatbelt Systems - System Operation and Component Description (501-20A Seatbelt Systems, Description and Operation).

To deactivate or reactivate the passenger Belt-Minder® feature, Refer to: Seatbelt Minder Deactivating/Activating (413-01 Instrumentation, Message Center and Warning Chimes, General Procedures).

Passenger Airbag Deactivation (PAD) Indicator

The RCM controls the PAD indicator through a direct, hard-wired connection, based on information provided by the OCS. The PAD indicator illuminates to indicate the passenger airbag is disabled. An exception to this is when the front passenger seat is determined to be empty and indication of a deactivated passenger airbag is not necessary. In all other cases, the PAD indicator is off when the passenger airbag is enabled.

The RCM briefly activates the PAD indicator to prove out the indicator function and verify proper functional operation of the PAD indicator to the front occupants.

The following table indicates the passenger airbag and PAD indicator status based on the size of the front passenger occupant.