Ford 1998 Windstar Owner's Manual page 88

To maximize fog lamp bulb life, it is recommended that the fog
lamp switch be turned off after each use prior to turning off the
headlamps.
To turn the fog lamps on, push the switch. An indicator light
will glow when the lamps are on.
To turn off, push the switch again.
"Headlamps On" Alert Chime
The "headlamps on" alert chime acts as an indicator that you
have left the headlamps or parking lights on. This continuous
chime will activate when the following conditions are present:
The headlamp and/or parking lamps are on
There is no key in the ignition
The driver's door is ajar (open)
Daytime Running Light (DRL) System (Canadian
vehicles only)
The Daytime Running Light (DRL) system is designed to turn
the high beam headlamps on, with a reduced light output and
without illuminating the high beam indicator lamp in the
instrument panel. The DRL system operates when all of the
following conditions are met:
the vehicle is "running"
the vehicle has a fully released parking brake
the headlamp system is in the OFF position
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