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My girlfriend has a 2015 Cadillac ATS. Her passenger side mirror was damaged - broken housing, and the light was dangling. I offered to replace it for her.

I ordered a used replacement mirror from eBay. I took off the door panel, swapped out the damaged mirror for the good mirror, reconnected everything, and put the door panel back on. It seemed like it went well, and it was very easy. There were three bolts to mount the mirror, and one electrical connector. The door panel only had the latch cable and a few more electrical connectors. There really wasn't anything to mess up.

However...

Once everything was back together, I turned the car on and tested the mirror's functionality. Nothing worked. It didn't move, the blinker on the mirror didn't light up, and the light at the bottom (I think it's called a puddle light?) didn't illuminate either.

Okay, so I need to take off the panel and start troubleshooting. Step one - open the door, then remove the panel. The door won't open. I unlock the doors and try again. Still won't open. I unlock them over and over, and neither handle (inside or out) will open the door.

My first thought was a sinking "oh no, I never reconnected the latch cable to the door handle. I put the window down, and forced a gap between the door panel and the door - just enough for a light to shine in there. I confirmed that the cable is attached, and when I pull the handle, it moves the cable forward, as it should.

I'm not sure what to do next. I want to look at the latch mechanism, but I need to open the door to do that. I want to look behind the door panel at the connections, but I need to open the door to do that too. Maybe I need to replace an actuator? ...need to open the door.

I really don't think the door is locked - I hear the passenger door lock moving when I lock / unlock the car. Does anyone have any ideas?

Oh, and I messed around with the driver's side door quite a bit to get a better understanding of what might be going on. I noticed the door latch has three positions... open, closed (pulling either handle while unlocked opens it), and a second closed position that doesn't open when a handle is pulling it. I can't remember for sure how I got it out of this third "super-closed" position - I think I had to push it open with a screwdriver, while pulling a handle.

Anyway, any help, insight, ideas, or suggestions are appreciated!
 

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If the power door lock isn't getting power, you can pull the handle lever twice to manually open the door.
Just guessing that could help open it, if a door power problem.

If a door power problem, maybe there is a blown fuse for the door.
 

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Discussion Starter #3
If the power door lock isn't getting power, you can pull the handle lever twice to manually open the door.
Just guessing that could help open it, if a door power problem.

If a door power problem, maybe there is a blown fuse for the door.
Thanks for the idea. I tried that this morning, with no luck.

I would love it if this problem ended up being a blown fuse. Any idea which fuse(s) I should check? I don't see any labels that resemble a door fuse.
 

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I don't know what size fuses are on this car, but in the past I've used a meter (or 12V light) to check across the fuse (many have exposed metal tips that you can probe on). If the fuse is blown, the light will illuminate (or you'll see voltage). This way, you can check the fuse without pulling it out.
 

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If not already done, try reading the fuse layouts in the owners manual, for a name leading
you to that area. Just a guess, since it may not be a fuse.

If you haven't started the car since this happened, do that and see if any messages or if
it resets anything.
 

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Discussion Starter #6
If not already done, try reading the fuse layouts in the owners manual, for a name leading
you to that area. Just a guess, since it may not be a fuse.

If you haven't started the car since this happened, do that and see if any messages or if
it resets anything.
I've been tinkering with this for a couple weeks, so I've done all the start / stop / on / off / accessories / resets and everything else I can do. Still nothing.

I linked the fuse layouts in my reply (here, for reference: Cadillac ATS (2014 - 2015) - fuse box diagram - Auto Genius). The problem is - I don't see anything that resembles a fuse for a door latch or locking mechanism. I'll try the tip schwinn posted above - checking each fuse without pulling them out. An excellent use of the beeping feature on my mutimeter.

Thank you for the reply.
 
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