Cadillac 2004 CTS Owner's Manual page 210

Lights Flash at Unlock
This feature turns on the exterior lamps when the
remote keyless entry transmitter is used to unlock the
vehicle. The lamps will remain on for approximately
20 seconds unless a door is opened, the ignition
is turned to ACCESSORY, ON or START or the remote
keyless entry transmitter is used to lock the vehicle.
Programmable Modes
Mode 1: ON
Mode 2: OFF
Before your vehicle was shipped from the factory,
it was programmed to Mode 1. The mode to which the
vehicle was programmed may have been changed
since it left the factory. To program the vehicle to
a different mode, use one of the following procedures:
To change the mode using the Base audio system,
do the following:
1. Enter the personalization portion of the SETUP
menu following the instructions listed previously.
2. Scroll to LIGHTS FLASH AT UNLOCK to highlight it.
3. Press the TUNE/SEL knob to switch back and forth
between on and off.
When the mode is turned on, a check mark will
appear next to the feature name.
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To change the mode using the Navigation system,
do the following:
1. Enter the Personalization menu following the
instructions listed previously.
2. Scroll to Remote Keyless Options to highlight it.
3. Press the TUNE/SEL knob to view the modes.
4. Scroll to Lights Flash At Unlock and press the knob
once to select it.
When the mode is turned on, an X will appear in
the box to the left.
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.