Two things that typically go wrong when this happens .
1. Is the switch, the contacts get corroded, you could remove and clean the contacts with contact cleaner .
2, motor sized .
With your finger push the switch backwards and you should hear a click and then move, if you just have a click
and no movement then the switch is good and the problem is with the motor ,Remove seat and inspect motor .
NO click bad contact in the switch most common issue .
If bad contact press the switch and wiggle this sometime get contact and will move .
switch has 6 way .forward ,backward , tilt front up and down tilt rear up and down .
Need any follow up help then please get back to me with the reply button, and not the poor or bad service.
This way i can get back to you or suggest another expert if needed.
If i do not get back to you then i may be off line, and when i get back online i will get back to you..
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Not rating or a bad rating does not constitute a refund.
If you are not happy or you have sorted out your problem before the answer then please let me know with the reply button .
Kind regards Greg.