I have 86 560 SEL the powered headrests don't work.I can feel the motor running.any ideas?

The motor drives a plastic gearing that the readrest locks into, most likely that gearing is defective.

Takes about 30-45 minutes to replace.

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The cars are different, but this may give you an idea of what to look for...

http://v12uberalles.com/power_head_rest.htm

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