Need help with getting my automatic head rest to work. The seat switch works fine: recline, tilts backwards and forwards, slides front and back, but the head rest is the only function not working. Took apart seat switch and cleaned the contacts, still a no go. I can hear a slight click when I try to move the head rest up or down. The clicking sound comes from under the seat whenever I move the switch. Not a continuous noise, but with each tap of the switch there is a click.......problem its on driver side. Thanks.

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1990 190E 3.0L