Porsche Cayman Owner's Manual page 26

Lock the vehicle with the key in the door.
The remote-control standby function
switches off after 7 days
If the vehicle is not started or unlocked with
the remote control within five days, the remote
control standby function is switched off (to prevent
discharging of the car battery).
1. In this case, unlock the driver's door with the
key at the door lock. Leave the door closed in
order to prevent the alarm system from being
triggered.
2. Press button 1 on the remote control.
The remote control is now activated again and the
alarm system is switched off.
Note
Do not insert the ignition key into the ignition
lock if the vehicle battery is discharged. The
ignition key can no longer be removed.
The key cannot be removed until the vehicle
electrical system is supplied with power again.
Please observe the chapter "EMERGENCY
UNLOCKING OF THE FRONT LUGGAGE
COMPARTMENT LID" on page 260.
Please observe the chapter "EMERGENCY
STARTING WITH JUMPER CABLES" on page
267.
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Controls, Instruments