Air Bag Deactivation Indicator: Description and Operation

INFLATABLE RESTRAINT IP MODULE DISABLE SWITCH INDICATOR

The instrument panel (IP) module disable switch ON/OFF indicator is an LED located in a position that can be viewed by the occupants in the front seats. The location varies depending on the vehicle. When the IP module disable switch is in the disable position, the IP module disable switch indicator illuminates. When the IP module disable switch is in the enable position, the IP module disable switch indicator is not illuminated. The IP module disable switch indicator will dim to a lower intensity when the headlamp switch is turned ON calculations to values stored in memory. When these calculations exceed the stored value, the SDM will cause current to flow through the appropriate deployment loops to deploy the air bags. The SDM records the SIR system status when a deployment occurs and requests the instrument panel cluster (IPC) to turn the AIR BAG indicator ON. The SDM performs continuous diagnostic monitoring of the SIR system electrical components and circuitry when the ignition is turned ON. If the SDM detects a malfunction, a DTC will be stored and the SDM will command the AIR BAG indicator ON. In the event that ignition 1 voltage is lost during a collision, the SDM maintains a 23-volt loop reserve (23 VLR) for deployment of the air bags. It is important to note, when disabling the SIR system for servicing or rescue operations to allow the 23 VLR to dissipate, which could take up to 1 minute.