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Not air... just a metal bar (archive)

[ Follow Ups ] [ 7-series (E32) Message Board ] [ Msg. Board FAQ ]

Posted by Kevin on April 05, 2001 at 18:37:18:

In Reply to: Operation of lumbar support? posted by Rich 1990 750iL on April 05, 2001 at 08:41:46:

I thought it was air too, but it turns out that it is just a metal bar that is on a geared down motor. As the motor turns the bar rotates and presses into the back of the seat. There are limit switches on the motor. It sounds like you may have one that is stuck. I had my motor stick on me (that is how I learned how it works). I gave the motor a gentle rap with a small ball pein hammer and it came back to life again and has been working for 3 years, not problem. The seat back is removed by two screws on the bottom (left and right sides) of the back seat cover.


How does the lumbar support in the driver's seat actually work? Here's what happens in mine. When I use the switch to increase the lumbar support, it feels like a balloon is filling in the seat, but it doesn't hold the air that is filling it. Once I stop pressing the switch, it feels as if the balloon is deflating.

So the question is, is there something similar to a balloon in there? And what do you think my problem is? TIA.

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