Porsche 928 1982 Owner's Manual page 11

Locks
Doors
Luggage compartment Activate alarm by closing rear lid, then turn S-key counter-clockwise.
Ignition/steering
Glove compartment
Fuel filler cap
Anti-theft alarm
(optional equipment)
If your Porsche is equipped with an anti-theft
alarm system, you will be given a duplicate
set of the master S-key illustrated above, in-
stead of the "regular" master key. The alarm
system can only be activated or deactivated
with the S-key.
Functions for both S-key and auxiliary key are
described above, as they pertain to individual
locking operations.
10
Key functions
Activate alarm by locking with S-key.
Deactivate alarm by unlocking with S-key.
Auxiliary key- lock or unlock when alarm not required (see "Central
door locking system").
Deactivate alarm by unlocking rear lid with S-key.
Auxiliary key - lock or unlock when alarm not required.
Lockable with either key.
Lockable with S-key only.
Lockable with auxiliary key only.
Attempting to open the doors, the rear lid or
the engine hood by any other means when
the alarm system is activated, will produce an
intermittent high noise for about 30 seconds.
The engine cannot be started while the
alarm system is activated.
Keep the S-key in your personal possession
at all times. Leave the auxiliary key only with
an attendant when the car is being serviced.
Keep plastic tag with key number in a safe
place. Do not leave it in the vehicle.