Cadillac 2005 CTS Owner's Manual page 210

This feature cannot be selected if Doors Unlock Key
Out/Off, Driver Unlock Key Out/Off or Driver Unlock in
Park (automatic transmission) is selected. If any of
these was previously selected, you must first de-select it
in order to be able to select Doors Unlock in Park.
The mode you selected is now set. You can either exit
the programming mode by following the instructions
later in this section or program the next feature available
on your vehicle.
Doors Unlock Key Out/Off
This feature allows the doors to automatically unlock
when the key is removed from the ignition on automatic
transmission vehicles or when the ignition is turned
to OFF on manual transmission vehicles.
Programmable Modes
Mode 1: ON
Mode 2: OFF
Before your vehicle was shipped from the factory,
it was programmed to Mode 2. The mode to which the
vehicle was programmed may have been changed
since it left the factory.
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To program the vehicle to a different mode, use the
following procedure:
1. Enter the personalization portion of the SETUP
menu following the instructions listed previously.
2. Scroll to DOORS UNLOCK KEY OUT/OFF.
3. Press the TUNE/SEL knob to switch between on
and off.
When the mode is turned on, a check mark will
appear next to the feature name.
If you select Mode 1, Doors Lock in Gear (automatic
transmission) or Automatic Door Lock (manual
transmission) will be turned on automatically.
This feature cannot be selected if Doors Unlock in
Park (automatic transmission), Driver Unlock in Park
(automatic transmission) or Driver Unlock Key Out/Off is
selected. If any of these was previously selected, you
must first de-select it in order to be able to select Doors
Unlock Key Out/Off.
The mode you selected is now set. You can either exit
the programming mode by following the instructions
later in this section or program the next feature available
on your vehicle.