Seat belt warning system.... later model cars, it is input into the airbag system. I am not sure with your car, but I would suggest not disconnecting them unless you know exactly what they are for.

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)