2007 Impala LT with stuck sunroof - Chevy Impala Forums
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post #1 of (permalink) Old 07-15-2019 Thread Starter
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2007 Impala LT with stuck sunroof

Pulled back the sunroof cover and opened up the sunroof to let the July heat escape. The sunroof extended fully back as usual. But then it wouldn't close. No mechanical sounds, just nothing. So I had an open sunroof, and you can't close the thing with mechanical force.

The sunroof fuse was visually OK, and checked out with a multimeter. Pulled out the switch pod (sunroof and homelink buttons) and checked it with a multimeter. Seemed OK. And the cable supplies 12 volts.

So I thought perhaps the motor has gone bad. I partially dropped the headliner and removed the sunroof motor assembly (three bolts). With the motor out, at least I could close the sunroof manually so rain wasn't a concern, that was a relief. The plastic cover on the motor assembly is easily removable to reveal a circuit board/relay, and the motor terminals. The motor tested OK using a 12v source and could run forward and backward. So perhaps the circuit board/relay went bad? I resigned myself to buttoning things up with the motor removed and just leaving it at that.

But then I noticed my rear view camera was not working. So I checked the fuse for the retained accessory power (RAP). That fuse (10 amp) was blown. Replaced that. Could the RAP fuse prevent the sunroof from working? I plugged the sunroof motor assembly back into the cable and sure enough it started to spin.

I reinstalled the sunroof motor, thinking I was home free. But not quite. Pressing the button creates a mechanical sound as the motor is trying is raise the sunroof into the first open position. Then it stops. Here's a clue: I can't pull back the sunroof cover from the open position. So it seems something is mechanically stuck or blocked or off track.

My guess is that something happened when I first opened the sunroof. Something got stuck, and this blockage perhaps overloaded the RAP fuse when I tried to close the sunroof. But it is odd that the RAP fuse blew rather than the sunroof fuse. Maybe the RAP fuse has nothing to do with the sunroof - I had a recently installed a hardwired dashcam, but that was working fine.

Any thoughts?
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post #2 of (permalink) Old 07-16-2019
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Being that the sunroof cover won't even move, I think I'd drop the headliner to see what is physically blocking it - which may also reveal what is causing the main issue with the sunroof as well. I mean the sunroof cover isn't really "connected" to the sunroof at all, so there should be no reason why you can't move the sunroof cover other than a physical blockage of some sort.

I dropped the headliner in my 2012 to add sound-deadener. It's a pain, but it's not *that* hard. Probably the hardest part is getting those big christmas-tree-style retainers out towards the back. My only advice is to wear gloves in hopes of trying to limit the amount of dirt/sweat that gets on the light-colored headliner (ask me how I know!). :-)

Curious to see what some of the smarter people have to say though!
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post #3 of (permalink) Old 07-16-2019 Thread Starter
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Thanks for the reply. Looks like I'll have to drop the headliner to find the cause. As a non-garaged car, it will have to wait for day when it's not 100 degrees and 100 percent humidity. And I'll have a pair of gloves to protect the headliner. I already added a few smudges so far.

There are some suggestions on the web to use a hex key or screwdriver to manually turn a sunroof motor. Of course you have to have access to the motor so that means dropping the headliner. I tried that approach by inserting a hex key in the motor access hole but couldn't get it to budge. I had to remove the motor to manually close the sunroof. BTW, those sunroof motors run about $100 to $200 and over on Ebay.
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