Ford 1999 Taurus Owner's Manual page 85

Setting the Autolamp On/Off Delay
System
By using the autolamp, you can set the headlamps
to:
turn on the lamps automatically at night
turn off the lamps automatically during daylight
keep the lamps on for up to three minutes after
you turn the key to OFF.
80
The controls for the autolamp
To use the autolamp:
1. Make sure the headlamp control is in the OFF
position. If the control for the headlamps is
ON, you cancel the autolamp.
2. Turn the ignition key to ON or start your
vehicle.