Just reporting on a minor issue with an easy fix on my 2008 H3.

After I bought the truck, I noticed that the power lumbar was not working.

I have read about -- and I am all too familiar with -- the GM seat switch issues that can be fixed by basically really abusing them, or just OCD keep trying them. My GMC Yukon Denali of about the same vintage had this problem big time. I ended up taking the switch panel out and using contact cleaner on the switches.

But on the Hummer, it was different -- I could hear, and perhaps to a small extent - feel - a slight clunk or click in the seat when I operated the switch. It has to be pretty quiet to hear the click.

The solution, however is the same. I obsessively tried the switch, and I felt it actually move just a bit. I kept trying, and finally got it working both ways.

I didn't even know it had power lumbar on the passengers side. Turns out it did, but with the same problem. Again, I tried it obsessively, and one time it extended, but wouldn't go back flat. It took quite a bit more trying on the passengers side, but it finally went back flat. I figured I should probably just quit while I am ahead, but OCD won't allow that. After really, really, obsessive trying -- in several separate sessions, the passenger side also started working as it should -- at least for now.

Takeaways:

1. OCD is a superpower
2. Whether or not you use your Power Lumbar -- Use your Power Lumbar at least occasionally. You may want to sell the truck someday. Probably the same for the seat position switches.
3. Listening carefully for a click or clunk will help you determine if it is the switch or the Lumbar motor/assembly. This same technique can be used to diagnose seat movement problems.

 

This advice worked. Just got a H3 a few months ago that had sat awhile and little gremlins are everywhere. The lumbar was flat and I just jiggled the switch several times for a few weeks then forgot about it until one day it did more than click.

 

you can deoxit the switch (electronics clnr)