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BMW M3 Maintenance and Repair

228 messages,  Last post on Nov 05, 2009 at 9:24 PM

You are in the BMW M/M3/M6 Forum. Your Host is claires

What is this discussion about? BMW M3, Coupe, Convertible


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#186 of 228
Convertible top won't go up! by rroscher
Oct 12, 2008 (6:59 am)
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my top stops half way up...It will go back down but won't go all the way up. it's Sunday so I thought I might throw this out for a quick solution!
 
Thanks,
 
Rroscher
#187 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (7:17 am)
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Replying to: rroscher (Oct 12, 2008 6:59 am)

Sounds like the hydraulic unit might be bad. I believe you can peak at it and look for leaks by removing the left side trim in the trunk. It's under the NAV computer and the radio receiver. If there's no leak I guess you have to bring it in and have it tested.
 
So can you gently urge it upwards with your hand? If it works with hand-assist, I'd say it's probably hydraulic. If it just jams up there, maybe there's a busted arm or bad bushing in the mechanicals.
#188 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (7:28 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 7:17 am)

Thanks! I tried a little more than gentle urge to no avail...It stops at the exact same spot every time, very strange...but it will go back down w/o any trouble. Could not find anything blocking it.
#189 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (7:38 am)
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Replying to: rroscher (Oct 12, 2008 7:28 am)

Okay. Does the motor keep humming or does it abruptly stop?
#190 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (7:49 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 7:38 am)

Keeps humming...
#191 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (8:10 am)
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Replying to: rroscher (Oct 12, 2008 7:49 am)

Okay I'm thinking loss of hydraulic pressure. Just a guess because we don't seem to have a jam (mechanical) and the motor is working (electrical) so by elimination....?
 
You might check for a hydraulic leak, as that could damage the upholstery or paint surfaces back there.
#192 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (8:47 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 8:10 am)

No leaks!
#193 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (9:20 am)
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Replying to: rroscher (Oct 12, 2008 8:47 am)

gotta be the pump. Internal pressure loss?
#194 of 228
Re: Convertible top won't go up! [Mr_Shiftright] by rroscher
Oct 12, 2008 (9:32 am)
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Replying to: Mr_Shiftright (Oct 12, 2008 9:20 am)

No pressure loss...Cannot figure this one out!
#195 of 228
Re: Convertible top won't go up! [rroscher] by Mr_Shiftright HOST
Oct 12, 2008 (10:12 am)
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Replying to: rroscher (Oct 12, 2008 9:32 am)

I don't know the specs for pressure but I'd imagine from the symptoms you describe that it's an internal leak in the hydraulic pump---since the top works part way and the electrical motor is working, hence top control module sending the right signals.
 
I believe there are trouble codes that can be read on this car to help with diagnosis on the top mechanism.

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