Question about Mercedes-Benz Cars & Trucks
More than likely the window lift motor is defective and the cause is the brushes are sticking. Other causes are of course the switch and the wiring to the door. The horn needs to be tested, pull it out and hook a jumper to the battery and see if the horn sounds, if it does then you may need to replace the ribbon contact under the steering wheel it has a open filament circuit that is to the horn switch. NOTE always disarm the airbag system before doing any work on the steering wheel.
Posted on Apr 08, 2017
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