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Help - reset auto window up (rear) with convertible top

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I repaired a rear window lift in my 2001 996 cabriolet this weekend and everything is working great with one key exception - that one window no longer automatically raises when the top is closed. The other three work fine - they were never disconnected but this one window stays open. I can raise it with the window switch. The other thing is that it automatically lowers with the top, it is just the auto raise function.

I tried what is referred to as 'standardising' the windows in the shop manual which is noted at the end of the window replacement section but either I am not reading it correctly or that just is not doing it. From what that says I simply close the top and then close the window but that has not gotten me anywhere.

Does anyone know how to reset / standardise the auto window function for a convertible?


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Not sure I follow your message Loren. No I do not have three posts on this topic.

I previously posted about replacing the actual lift which nobody seemed to have anything to share. I tackled that myself and it is fixed. I also posted a follow up with pointers since nobody else seems to have tackled that particular repair diy. I am hopeful that will be helpful since others have experienced that particular problem before.

This issue is with the syncing of the auto up feature or whatever you call it.

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Thanks for the reply. I have tried that as well. It appears that works to reset the auto one click up and down on the front windows but it is not doing anything for the rear.

Here are the symptoms again -

The power window works so I manually raise it with the rocker switch. Upon opening the top, all four windows automatically retract as they should and if held past the top opening the front two raise again - as they should. Now when I close the top it goes through the whole motion until it gets to the windows. The front two raise as does the passenger rear while the driver rear does nothing. So I use the window switch instead and raise that one window.

I called a dealer yesterday to ask if they was something I had missed - like turn your head to the left and cough twice or whatever - and you can imagine what he said: "bring it in for 1 hour at $135 and we we will reprogram the entire convertible top with the computer". While I guess that is an option - I was hoping for an easier solution... easier and cheaper.

I appreciate the suggestions!

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It could be the top controller unit as that does control all four windows during operation of the convertible top. However, since it's going down it seems to me it's more a sensor or microswitch that isn't reading that the window is in the down position and needs to close when the top goes up. I'm not sure if the windows have potentiometers like the rear deck and top do, but I'm guessing that if you hooked it up to a PST-2, it would say that your window is always in the up position. I'd have to check the manual to see where that sensor or potentiometer is located.

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I don't see a reason why that would make any difference with the window operation, but computers are funny things. You never know.

You really need to hook the car up to a PST-2 to see what the controller is saying about all the convertible top systems.

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Update - I met with JeTexas on Friday to hook up the car to the PST2 for testing and calibration. The computer ran through the calibration sequence without issue but that window is still not operating as part of the top closing process. Again, the window works just fine via the window switch and it opens when the top is lowered, it just does not join in on the sequence to close the window as the top closes like the other three windows.

I called the dealer last week to see if they had a secret to get it back in line and they wanted to charge me 1hr to calibrate the top. The top calibration takes about 30 seconds but nevertheless we tried that and it did not fix the problem.

Anyone have troubleshooting suggestions?


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  • 2 years later...

I'm restarting this post because I have the same exact problem and I'm hoping you found a fix. My windows react normally when I take the top down, but for some reason the driver rear window does not go up when I close the top. The motor works because I can manually raise the window using the rocker switch. Any thoughts on how to fix the rear driver window so it automatically raises like the passenger rear does?

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