While driving mercedes benz s500 warning message displays doors and trunk open although all appear closed

SOURCE: replacing the battery in a 2001 mercedes benz

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.

SOURCE: 2002 mercedes s500 trunk will not open

Hi there
First of all may i say i feel your pain. literally. the same thing happened to mine. here is what i did
Firstly i needed into a locked boot urgently (for wifes wheelchair)
so i cut a rectangle out of the boot put my hand in and pulled the release mechanism, that worked but left me with a hole in my boot.
I suggest that you try this instead.
remove back seat
the central locking pump is located next to the battery (black box with yellow air lines going into it.)
Unplugg the filler cap cover air line, then unplugg the boot air line and put it into the filler cap cover socket.
now when you unlock the car the boot should automatically open.
If it does not the problem it on the boot air line and you should strip the trim out of the boot to check, but you still have to get in and may have to do what i did initially.
If changing the air line worked then you will soon get tired of having to shut the boot everytime i solved this problem by routing the filler cap air line to a pnuematic switch (LEGO) This switches between the boot and the filler cap. bit naff but it works and cheaper than having to replace pump and have computer and keys re-coded total cost around £600.
op that helps

SOURCE: Mercedes-Benz 320clk coupe 2002 with dead battery

Posotive can be found in hood driver side next to fuse box. It is a small rectangle box. You can hook negative to any solid ground on the car.

SOURCE: trunk qill not open

Your trunk lock actuator is probably in valet mode. Take the mechanical key out of your smart key(should have a release button on the bottom of the key which will allow you to slide the hidden mechanical key out of the plastic housing) insert it into your trunk lock actuator and turn to change your function of trunk actuator. In the valet mode the trunk does not respond to your central locking or release button commands. Your owner's manual will tell you about these features. I hope I have been helpful

SOURCE: Merces Benz s500, Ignition key does not turn, can

Check Battery in car(make sure is not weak or dying), check battery in remote fob, possiable draw in system possiable fuse or possiable keyless entry module failure