Firing Strategies

WARNING: This page is about a different car, the 2011 Jaguar XKR, 2011 Jaguar XK, 2010 Jaguar XKR, and 2010 Jaguar XK. However, it is still accessible from the selected car via links, so may be relevant.

The safety belt pretensioners are fired when either the pretensioner impact limit or the roll over limit is exceeded. The restraints control module (RCM) only fires the pretensioners if the related safety belt is fastened. For the front passenger pretensioner to fire, the seat must also be occupied by a person.

The driver and passenger air bags are only fired in a frontal impact that exceeds the stage 1 threshold. Both stages of the inflator in the driver and passenger air bags are fired. At impacts between the stage 1 and 2 thresholds, the delay between the firing of the two stages varies with the severity of the impact; the more severe the impact the shorter the delay. At stage 2 impact thresholds and above, the two stages of the inflator are fired almost simultaneously. The time delay between firing the two stages of the driver air bag inflator is increased if the driver seat is forward of the seat position sensor switching point.

If a side impact limit is exceeded, the restraints control module (RCM) fires the side air bag on that side of the vehicle.

If multiple impacts occur during a crash event, after responding to the primary impact the restraints control module (RCM) will output the appropriate fire signals in response to any further impacts.