Porsche 911 Carrera Owner's Manual page 52

Safety belt height adjustment (Coupc and
Targa)
Adjusting belt height
The height of the belt deflectors for the driver's
seat and passenger's seat can be adjusted. Adjust
the height of the safety belt so that it runs across
the middle of the shoulder, not against the neck.
Upward - push belt deflector up.
Downward - press button (arrow) and move
belt deflector.
50
Controls, Instruments
Cleaning the safety belts
If it becomes necessary to clean the belts, you can
use any mild washing agent. Allow the belts to dry
prior to retracting, but avoid direct sunlight.
Only use suitable cleaners. If unsuitable
cleaners are used or any attempt is made
to dye or bleach the belts, the webbing may be
weakened and thus constitute a safety risk.