Chrysler 2005 PT Cruiser Convertible - Manual (Page 26)

To disarm the system:
Unlock a front door/deck lid using either the key or the
Keyless Entry Transmitter.
Starting the vehicle with a valid Sentry key will disarm
the system. A valid key is one that is programmed to that
particular vehicle. A valid key will disarm the system, an
invalid key will trigger the alarm.
Tamper Alert
If the horn sounds 3 times when you unlock a front door
using either a key or the Keyless Entry Transmitter, the
alarm has been activated. Check the vehicle for tamper-
ing.
Security System Manual Override
The system will not arm if you lock the doors using the
manual door lock plunger.
DECK LID
NOTE: The key that is used to start the vehicle is also
used to lock or unlock the doors and open the deck lid.
Door Lock Plunger
26 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE