You get tools and you take it out or if you dont know how to take them out go to an engineer
unscrew the bolts and take the seat out
Push very hard at the center of each back seat (left and right seat) towards the back of the car. Then, while pushing back, lift up. It will pop out of its catch.
Remove rear seat and remove battery
remove passenger seat in 2003 cadillac cts
2000 sonata rear seat removal
Unbolt it from the floor
To remove the rear seat from a 2007 Cadillac DTS Sedan, start by locating the release mechanisms at the front of the seat bottom; pull up on the levers or tabs to detach it. Once the seat bottom is removed, you can access the rear seat back. Look for bolts or fasteners securing the seat back to the frame, usually located at the bottom or sides, and remove them. Finally, lift the seat back upward to detach it from the vehicle.
To remove the back seat in a 2007 Cadillac DTS, start by locating the seat release mechanisms, which are typically found at the base of the seat cushions. Use a flathead screwdriver to pry up the seat cushion, if necessary, to access these clips. Once released, pull the seat cushion upwards and out. For the seatback, look for bolts or clips securing it to the frame, remove these, and then lift the seatback out.
Its under the rear back seat, you need to remove the bottom portion of the rear seat to get to it.
1. Remove bottom part of back seat 2. Unscrew back seat back bolts to remove upper back part of seat 3. Once you do this you can get right at the speakers by removing the cover on top of the speakers
Grab it from underneath the front of the back seat and exert a little pressure to jerk it up. It won't hurt the seat. The battery is located under the back seat. The seat goes back with no problem.
Photos of tabs to remove