GM Service Manual Online
For 1990-2009 cars only

Perimeter Lighting for Buick Lucerne 2009

If it is dark enough outside when the unlock button on the remote keyless entry transmitter is pressed, the DRL, parking lamps and back-up lamps will come on.

This feature can be programmed on for various amounts of time in seconds for each transmitter.

See DIC Vehicle Customization for information on programming.