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Reverse controls is the position sensor, i did a write up about this about a year ago with pictures. Replacing the buttons wont fix that...... your really need a computer that can read the positoin of the seats to know wihch way its out.

What you do is remove the plug for the position sensor, roll the seat the opperiste way your supposed to (after you have read the sensor with the computer), it will only move about 1/2inch as theres no input for the position sensor, keep doing this till its all the way back OR forward, then put the sensor on and roll it the other way.

What your doing is correcting for a bad position sensor location, your moving the seat with no sensor, this rolling the sensor one way to correct for the incorrect position. You can do any of this withut having a computer to tell you which was outs out though.

Do it the wrong way and you put it out alot further.

Bolster, not sure about, mine is intermittent. Personally just think is bad wiring, maybe corrosion as most of my area under the seat looks to have surface rust, my BMW doesn't have any rust in it at all (15 years old).
 

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Not sure the dealer will help, i figured it out by reading the sensor as i was moving the chair.

Heres an example (of what mine did).

I would move my chair forward, then 8 inches from the steering it stopped, it wasnt fully forward. Sometimes when i pulled BACK on the seat button it went more forward, so at that point the controls had reversed.

The below numbers are likely wrong but gives you the reason behind whats going on…. The tester showed the seat position sensors was at 32000 (it counts up as it went forward) then at that point went from 32000 to -32000 so that button then did the reverse, pulling back went forward as the seat computer reached its "count" limit.

I guess they thought the amount of play they would have would be fine, however after 10 years of use it got out of spec. So moving the seat with the position sensor unplugged allow you to move the seat and it not count, then plug it in to make it count "down" to 0.

Thing is you only get about 300 counts for a full movement, so would take you hours to reset it. I am guessing its a disc with holes in it (a bad one at that), knowing GM just replaced the whole base of the seat it would have come with the motor, position sensor and computer, they wont be able to diagnose that kind of thing. I would think the Tech2 would do it, however did they have training on the seat counter? Would high think not, when they just replace the whole seat base when it played up.

The post with the picture is below (took me a while to find it)

http://www.cadillacforums.com/forum...ric-seat-weirdness-2004-esv.html#post12305817
 

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Seat bolsters are weird, mine are intermittent. Mine also "sag" to being off, its not air powered is it (loosing air?). I think most of the problems on these trucks is bad ground, all GM cars in the UK suffered from that. Remove ground connections, 800 snad paper at that connection point on the chassis and lug fixed MANY problems that never returned normally.

Same with BMW cars (however that tends to be the battery not the ground terminals).
 
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