Cadillac 2002 DeVille Owner's Manual page 184

Lights Flash at Unlock
This feature allows the parking lamps to flash
twice when the remote keyless entry transmitter is used
to unlock the vehicle. All doors must be closed, and the
lamps will not flash if the manual parking lamps or
headlamps are active.
Programmable Modes
Mode 1: ON
Mode 2: OFF
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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 determine the mode to which the vehicle
is programmed or to program the vehicle to a different
mode, do the following:
1. Enter FEATURE PROGRAMMING following the
instructions listed previously.
2. Press the down arrow on the INFO button until
LIGHTS FLASH AT UNLOCK appears on the
DIC display.
3. To turn on the feature, press the ON/OFF button
until ON appears on the DIC display. To turn it
off, press the ON/OFF button until OFF appears
on the display.
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.