my passenger seat will not raised up or down but you can hear the motor when switch is used?

I have a 91 E31, my passenger seat will not raised up or down but you can hear the motor when switch is used. what might be the problem?

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[Nick at Pelican Parts]

The motors have transmission cables that sometimes work there way loose. Try securing the drive cables first

- Nick

[Ron5oh]

Is it the entire seat or is it the recline angle is not changing? If it is not reclining, then you'll need a
new plastic gear. Gears are $40.