2011 SRX left rear seat release latch won't release the seat to fold down? Alternate method?

There isn't much available on how to do that as they are not part of normal operation. My guess is that underneath you will find bolts that you will need a socket set to remove.

https://www.google.com/search?q=2011+Cadillac+SRX%2C+remove+folding+third+row+rear+seats

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There is any fuse?

i have a Cadillac srx, my 3rd row is now coming up can you help me. i tried the buttons, they make a beeping noise but the seat doesn't come up

If that model has a fold down section of the rear seat back, the manufacturer normally installs an accessible manual boot release tab in the vicinity of the fold down seat section just inside the trunk compartment.

If there is no fold down seat in that model or no manual boot release inside the trunk area, the rear seat needs to be removed so that you can access the trunk from inside the car.

your best option is to try unbolting the seat from the car to access the latch then pry it open with a screw driver
after its removed you will need to go though the proces to remove the seat cover and repair the release mech.

To fold-down rear seat on 2007 Chevy Malibu, follow these steps:
1. Open the trunk
2. Pull on one or both the handles located on the upper side of the trunk
3. The handle located on the driver's side will unlatch the bigger part of the read seat
4. The handle on the passenger side will fold down the smaller portion of the rear seat.
5. Once done, you will have a seat that's nicely folded down.

You should notice a looped strap of cloth next to the head rest at the top of the seat. That is the release for the seatback lock. Simultaneously pull up on the strap and pull the head rest forward to fold the seat forward. The seats are split 60/40, so each seat has its own release looped strap.

Be sure that your model has fold down rear seats...you should see the seperation around both rear seats...if equipped, the fold down release is located at the top corner of each rear seat...pull the lever up to release...if your model does not have the fold down option...you will need to remove the rear seat...remove the lower cushions first...look on the lower front of the seats for hold down bolts...second you will need to remove the top of the rear seat...hold down bolts are at the bottom of the top cushion...after removing the bolts (one each side) you need to push up on the cushion to remove...this will then allow access to the trunk...find the trunk latch and try to release by twisting the latch cable...Hope this helps...

Got it, with the help and eyes of my wife. The rear latch releases as the seat back is lowered. This release is ALMOST seat back down (about 3 inches above the seat bottom). As the seat back lowers, apply constant lift on the rear latch, and it will release as the seat back lowers. Hard-won knowledge - I think I invented some bad words in the process.

I had the same problem on my '03. The seats would not fold down using the latch release as I had always done. So I tried a combination of pulling up on the side latch AND the top latch and the seat folded down. It really doesn't FIX the problem but circumvents offending  defective part. I will use this method until it doesn't work then I might shell out the $$$$$ to the dealer.