Ford Mercury Villager 1997 Owner's Manual page 82

The headlamp knob
A chime will sound if any of the exterior lamps are on when the
driver door is opened.
Daytime Running Light (DRL) System (Canadian
vehicles only)
The Daytime Running Light (DRL) system turns the high beam
headlamps on, with a reduced light output, when:
the engine is running
the vehicle has a fully released parking brake
the headlamp system is in the OFF or first (parking lamps)
position
NOTE: You may notice that the lights flicker when the engine
is turned on or off. This is a normal condition.
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