Buick REGAL 1997 Manual page 119

Twilight Sentinel
Twilight Sentinel provides a period of exterior
illumination as you leave the vicinity of your vehicle.
The feature is activated when your vehicle's headlamps
are on due to the automatic headlamp control feature
described previously in this section, and when your
vehicle's ignition is turned off. Your headlamps will
then remain on until the headlamp switch is moved from
OFF to the parklamp position or until a 90 second
illumination period has elapsed.
If you turn off the ignition with the headlamp switch in
the parklamp or headlamp position, the Twilight
Sentinel cycle will not occur.
You can customize the vehicle to activate the Twilight
Sentinel when your vehicle's ignition is turned off under
the conditions described above, or you may choose not
to activate this feature under any conditions. The
enabledldisabled state of this feature will be toggled
when you perform the following sequence with the
doors closed and the ignition key in the RUN position:
Press and hold the power door lock switch. While
holding the door lock switch, cycle the headlamp switch
on and then off two times. Release the power door lock
switch. These operations must be carried out in a time
period of less than 10 seconds, followed by a delay
period of no more than 10 seconds. Then, press and hold
the power door unlock switch. While holding the door
unlock switch, cycle the headlamp switch on and then
off two times. Release the courtesy door unlock switch.
These operations must be carried out in a time period of
less than 10 seconds.
After releasing the door unlock switch, a single chime
will be heard if the Twilight Sentinel function has been
disabled; two chimes will be heard if the feature has
been enabled. This feature will be enabled when your
vehicle is shipped from the factory. Disconnecting the
vehicle's battery for up to a year will not change the
programmed operation of this feature.
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