Porsche 2007 Cayenne Owner's Manual page 50

Belt tensioner
Depending on the force of a collision, fastened
seat belts are automatically tightened in an acci-
dent.
The belt tensioners are triggered in:
– Front and rear impacts
– Side impacts (only belt tensioners of the front
seats are triggered)
– In cases of vehicle rollover
Maintenance Notes
The belt tensioner system can be triggered only
once; the system must be replaced afterwards.
If there is a fault in the belt tensioner system, the
airbag warning light lights up.
Work may be performed on the belt tensioner
system only by an authorized Porsche dealer.
Smoke is released when the belt tensioners are
triggered.
This does not indicate a fire in the vehicle.
50
Seats, Mirrors and Steering Wheel
Safety Belt Warning System
An audio-visual warning system is interconnect-
ed with the driver's safety belt.
Every time the ignition is turned on, the gong will
sound for about 6 seconds to remind driver and
passenger to buckle up.
In addition, the gong will sound for approx.
90 seconds if vehicle speed exceeds 15 mph/
24 km/h.
The safety belt warning lights in the instrument pa-
nel and multi-purpose display will go off as soon as
the driver has buckled up.