2001 Mercedes benz trunk realice bottom if the battery is flat

It is a body control module

remote batteries are dear or the interior reciever has gone bad..try new batteries and make sure the transmitter is working...most big parts stores can do this for you

Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c

check behind back seat for a release

In the trunk. It under the trunk floor.

Try unhooking the battery for a few minutes to reset computer. Also check your fuses and relays

The battery is placed in the trunk, at the right bottom side.

battery located in the trunk beside the spare tire.

If you mean key will not turn in ignition,charge or jump start
Car has electronic ignition switch
If battery is low/flat it will not turn

Trunk< under left panel>

Battery base has a device that clamps the battery on a step/notch on the side. Use a ratchet with an extension to loosen. Once it is loose you can remove the battery.