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Problematic tonneau cover release.....

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Old Aug 20, 2025 | 11:37 AM
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Default Problematic tonneau cover release.....

As many here know, I have a 2000 C5 Vert. A few years ago my tonneau cover wouldn't release some of the time. I bought a new release button, and it seemed to help some. Fast forward 3 or 4 years, and now I have to use the cable to release the cover. Since the button is relatively new, I'm assuming that the issue is in the electric release. I've tried moving the cover by hand, up and down, thru it's range of motion while holding the button down, hoping this might make it work, which would indicate a broken wire. But it makes no difference. Has anyone else had this problem, and is there something I can clean or adjust in the release? How did you fix it? I'm pretty good mechanically, but somewhat challenged with electronics Thank you, guys....
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Old Aug 20, 2025 | 12:30 PM
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I had this issue, but in the end, it turned out to be that my fuse box (interior) was corroded from water intrusion (previous owner. and the car was bought nonworking.)

C5diag Rob went out of his way to help me on this, and I still owe him a bottle for it.
Do you hear anything when you press the yellow button?
Have you checked the fuse and relay associated with this?
Have you tried jump-in button?
Are your windows lowering when you press this button?



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Old Aug 20, 2025 | 04:06 PM
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Don't know about the windows. But I opened the trunk, then tried to open the tonneau. I know this wont work, as they both can't be open at the same time. I was listening for the warning bell to ring 3 times, and it did. So that tells me the button is working, because of the warning jingle. But it seldom works anymore.....
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Old Aug 20, 2025 | 06:53 PM
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I would see if the windows go down when pressing that button; they should.
If the windows do work, it may cut out a lot of troubleshooting.
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Old Aug 21, 2025 | 07:49 AM
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Thanks pjdbm. I'll check that today and report back...
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Old Aug 21, 2025 | 11:02 AM
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OK. The windows don't go down, but there's a soft, slight tapping sound that seems to come from the passenger side near the dash or front of the seat. If I put the key in, the windows still don't go down. On one try I turned the key on, then off, and "woke" up the modules. Then the windows went down, but cover stayed shut. On one try the tonneau worked and the windows went down. Frustrating......
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Old Aug 21, 2025 | 04:45 PM
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It's kind of weird that it's intermittent like that.
That clicking sounds like a relay #41,

This was my ordeal below, a lot of great information, including testing, and what voltages to expect from certain test points
https://www.corvetteforum.com/forums...-not-work.html
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Old Aug 21, 2025 | 09:59 PM
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Grinder, by curiosity, have you checked to see if there are any codes related to this?
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Old Aug 22, 2025 | 07:13 PM
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There are no codes. However, I found the "problem." The relay for it is in the passenger footwell (thanks a bunch, GM!). I unplugged the relay and reinserted it a couple of times. Works every time now. I've found the same thing in TV remote controls. Sometimes spinning the AA or AAA batteries makes a new, clean connection, and they work fine afterwards. Thanks to the guys who tried to help me out.
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Old Aug 22, 2025 | 09:53 PM
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thats great!
easy fix!
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Old Aug 23, 2025 | 05:23 PM
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Uh.....Yeah, after you contort yourself getting to the footwell fuse box. I'd like to take the engineer that placed the fuse box there out fishing. On Lake Superior. Alone. Then help him find the wreck of the Edmund Fitzgerald. He'd go in first, of course.....
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Old Aug 24, 2025 | 01:48 AM
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You should try totally removing the fuse box, like I had to do, and reinstalling it
What a bitch to get back in after all the harnesses are out
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Old Aug 25, 2025 | 03:15 PM
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Originally Posted by pjdbm
You should try totally removing the fuse box, like I had to do, and reinstalling it
What a bitch to get back in after all the harnesses are out
What a nightmare!
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