Chrysler PT Cruiser Owner's Manual page 18

16 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
If the bulb begins to flash after the bulb check, this
indicates that an invalid key has been used to start the
vehicle. Both of these conditions will result in the engine
being shut off after two seconds of running.
Keep in mind that an unprogrammed key is also consid-
ered an invalid key even if it is cut to fit the ignition lock
cylinder for that vehicle.
If the Vehicle Security Light comes on during normal
vehicle operation (when the vehicle has been running for
longer than 10 seconds), a fault has been detected in the
electronics and the vehicle should be serviced as soon as
possible.
NOTE:
The Sentry Key Immobilizer System is not compat-
ible with remote starting systems. Use of these systems
may result in vehicle starting problems and loss of
security protection.
Exxon/Mobil SpeedPass™, additional Sentry Keys ,
or any other transponder equipped components on the
same keychain will not cause a key-related (transpon-
der) fault unless the additional part is physically held
against the ignition key being used when starting the
vehicle. Cell phones, pagers, or other radio frequency
controlled electronics will not cause interference with
this system.
All of the keys provided with a new vehicle have been
programmed to that vehicle's electronics.
Replacement Keys
NOTE: Only keys that have been programmed to the
vehicle electronics can be used to start the vehicle. Once
a Sentry Key has been programmed to a vehicle, it
cannot be programmed to any other vehicle.