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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Mon, Oct-14-2019, 07:53:04 PM   #1
Aeko
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Default Power Bolster / Lumbar repair

Have any of you repaired a seat with the inflating lumbar / bolster supports? My M3 has them and they sort of work, but will deflate after about 20 seconds of being fully inflated. I have only found threads about retrofits but not any about repairs to an existing system with a possible leak issues.

http://www.m3forum.net/m3forum/showt...umbar+retrofit
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Old Mon, Oct-14-2019, 08:04:37 PM   #2
lemoose
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Default Re: Power Bolster / Lumbar repair

my car has this option and both bolster supports deflate just like you describe. the pump/valve part is the same for both lumbar and bolster supports i believe. but last i checked it is about 200+ for a new pump. as rare and unique as this option is, i think i'd prefer a pair of seats in 9/10 condition for the price
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Old Tue, Oct-15-2019, 02:37:09 PM   #3
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Default Re: Power Bolster / Lumbar repair

while checking those part# listed from another thread ..
perhaps the leak was developed at around one/or multiple of those air nozzle head inlets/outlets when the plastic tubing got old and hard ..

only wish i have the clear knowledge on how to take apart those heavy seats ..
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Old Tue, Oct-15-2019, 02:44:52 PM   #4
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Default Re: Power Bolster / Lumbar repair

Quote:
Originally Posted by lemoose View Post
my car has this option and both bolster supports deflate just like you describe. the pump/valve part is the same for both lumbar and bolster supports i believe. but last i checked it is about 200+ for a new pump. as rare and unique as this option is, i think i'd prefer a pair of seats in 9/10 condition for the price
That answers my question exactly, thank you! I figured there was a valve somewhere in the system. I can't remember if the passenger side has the same system, but if it does I may cannibalize some parts from that seat...

Quote:
Originally Posted by chalaka View Post
while checking those part# listed from another thread ..
perhaps the leak was developed at around one/or multiple of those air nozzle head inlets/outlets when the plastic tubing got old and hard ..

only wish i have the clear knowledge on how to take apart those heavy seats ..
I was thinking the same thing. Either a leaky hose or bad valve. I don't have the garage space to pull these seats right now but if I get around to doing this repair I'll see if I can update the thread with pictures and info.
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Discussing Power Bolster / Lumbar repair in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)