How to fold down rear seat in 2007 impala to replace rear speakers? there are no latches to pull.

If you have the long bench I don't think you can fold the rear seat down. It will only fold down if you have the split rear bench.

The back seat of the Impala can only be folded down if your vehicle is the particular fold-down version, otherwise, it'll have to be removed entirely to gain access to the massive available space.
To remove the seat, follow these steps:
• Push down on the bottom cushion of the back seat.
• Pull-on the T handles which are under the front edge of the seat, to release the bottom cushion
• Remove the cushion
• Unwind the nuts and bolts on the bottom part of the back seat. Then lift it, and it would be released from its position.
• Now, remove the seat from the back and you can access the trunk.

On that model the only way to access the trunk when the latch has broken or has malfunctioned is by removing the entire rear seat assembly.
You need to pull the bottom section(the part you sit on) of the rear seat up and take it out of the car. Under the back section of the seat you will find a pair of bolts that hold the upright section of the seat to the car body. Remove the bolts and lift the seat back section up and remove it. Remove the protective layer and you can crawl into the trunk. You can then access the trunk latch from inside the trunk.

The vehicle should of course have been engineered with at least a narrow center fold down section of the seat from where you can access a manual trunk release . No doubt as a silly cost saving measure it was not designed this way.

First make sure you even have the rear seat fold down option. Many, if not all, LS Impalas don't have the option. Easiest way to check is to open the trunk and look for the latching hardware at the back of the back seats.

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.

2008 chev impala in Canada, at least ours does, has a pull tab at the outside edge of the rear seat , left and right side, just like the center consul has. Pull on the tab and the seat folds down.

First fold down the rear head restraints by pressing the button on the side of the head restraint. Now you can fold your seat down in either of these two ways:
1. Pull the button on the top of the seat to unlock it from its position; you will notice a raised tab when the seat is unlocked
2. Depending on the type of seat you have, you can lower it by pulling a lever on the right side of the rear cargo area.
Remember, the seat belts should not be fastened when you attempt to lower the seat.

To fold down, follow these steps:
1. There is a loop located in the middle of the back seat - pull it forward and the bottom part of the rear seat will fold down
2. Wedge the the back seat, and it should not give you any trouble in folding down
3. To ensure that the seat goes all the way down- remove the headrest.
If your seat can not be folded-down, follow these steps to remove it:
1. Put some pressure on the bottom cushion of the back seat.
2. To release the bottom seat, pull the T handles, and then remove the cushion
3. There will be some bolts and screws on the bottom of the seat - remove them, and then you can pull out the seat.

I solved the problem by spraying WD40 into the front side of the seat support that was sticking. This support has a rubber closure to protect the mechanics of the seat. After spraying a generous amount of WD40, I waited about 5 minutes and tried the lever to fold the seat. It worked and still does.

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.