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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 03-24-2008, 04:29 PM   #1
silentak1
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Convertible Top Reset or Resynchonization?

I've noticed that my top is closing too fast and as a result, it makes a "thump" sound when the top becoming parallel to the floor (It's about after 2-3 seconds after it comes out of storage).

Does anyone know a possible solution to fixing this issue?

People have told me that I should reset the closing sequence, but I'm not sure what the procedure could entail. Anyone care to lighten me?
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Old 03-24-2008, 05:00 PM   #2
Philbert
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for a good Q!

You mean to "hyperextends" - gets too flat too soon and the motor keeps trying to extend/flatten it when it's already flat?

Was there any "trauma" to the top prior to this issue?
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Old 03-24-2008, 05:04 PM   #3
silentak1
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I suppose I could call it "hyper extends". The top "slams" when it becomes parallel to the floor, almost as if its closing way too fast.

There was less noticeable "trauma" prior to this. Are you or did you experience this?
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Old 03-25-2008, 12:23 AM   #4
Philbert
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Quote:
Originally Posted by silentak1 View Post
I suppose I could call it "hyper extends". The top "slams" when it becomes parallel to the floor, almost as if its closing way too fast.

There was less noticeable "trauma" prior to this. Are you or did you experience this?
Didn't experience it (yet - knock on wood!). the "trauma" i asked about was to see if maybe the top had hit something or was affected by a person or a jamb in the past...which may have lead to your current trouble

Hope it works out soon and cheap for you- keep us posted!
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Old 03-25-2008, 07:02 AM   #5
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I can understand what you're talking about as the top opens and gets perpendicular, then gravity typically takes it down within about 6 inches of the windshield. That's where you're saying it doesn't stop like it's supposed to as if the hydraulics (?) were already extended to the open position. Have you stopped the opening process midway and surveyed all the linkage inside the roof compartment? Please post any progress you make with this issue.
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Old 03-25-2008, 11:29 AM   #6
silentak1
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Originally Posted by ctrog330 View Post
I can understand what you're talking about as the top opens and gets perpendicular, then gravity typically takes it down within about 6 inches of the windshield. That's where you're saying it doesn't stop like it's supposed to as if the hydraulics (?) were already extended to the open position. Have you stopped the opening process midway and surveyed all the linkage inside the roof compartment? Please post any progress you make with this issue.
It does happen when i'm opening the top, but it's very noticeable when it's closing. The only way to (manually) make it close smoother is by releasing the "close" button when its coming down, and then simply letting the top "slide" to parallel position to the ground. I will look carefully into the components today and repost.
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Old 03-25-2008, 11:40 AM   #7
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I'll whip open the Bentley Pubs repair guide and see what all is involved. Spring is the wrong time of year to have a problem with the lid.

By the way, since we're talking about convertible's, I wouldn't mess around with the open/close buttons too much. I did that and wound up with a $250 shorted out wire.
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Old 03-25-2008, 06:54 PM   #8
BavLar
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Look up the following items and see if they might be related to your issue:
1. Tension Bow Angle Hall Sensor
2. Main Pillar Hall Sensor
Also, it mentions fault codes which are stored in the Convertible Top Module (CVM II). Up to 16 codes can be stored in memory by order of occurance. Whatever happened to cause your issue probably triggered a code which can be read with BMW diagnostic scan tools DIS or MoDiC (of course we all have a couple of MoDiC's around the garage!).

Good luck...and keep your head down!
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