ryanchristopher,

It's the light to tell you that one of your exterior lights is out. Check all the headlights/taillights/turn signals/brake lights/fog lights, and don't forget the 3rd brake light.

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-- Paul W. (The Benzadmiral)
('03 Buick Park Avenue, charcoal/cream)
Formerly:
'97 C230, smoke silver/parchment; '86 420SEL, anthracite/light grey; '84 280CE (W123), dark blue/palomino