99slk 430 cpe, battery dead, need way to access trunk for jumping off, key doesn't work

there is a battery pos post under the bonnet/hood but you should be able to open the boot/trunk using the manual key access in the boot /trunk plinth unless its siezed cos it has not been used try a bit of wd40 and work the key gently till it gets free

So you have no other option but to jump start the car, by finding power cables in engine bay or pribe open the trunk with a crow bar, or have i towed to a auto shop so a professionel locksmith can open the trunk for you.

use a wedge in door top grab handle with wire open, then remove rear seats .

Hi Your S class has two batteries. The smaller one is located in the engine bay, and the bigger one in the boot (trunk). No need to access any of them, simply open the door with key, insert key to start engine, you will notice that not all ignition lights will come on, but the engine WILL start, and the batteries will be recharged after a short while.

you should be able to access the trunk through the rear seat. check your owner's manual. once inside the trunk, there should be a trunk latch release on this new of a vehicle.

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

check under the hood for a red cap over a stud looking rod, that would be your battery positive jumping rod, then just ground it to a suitable clean grounding spot away from any fans, belts or pully's

Pop open the hood (bonnet) on the left isde of the firewall there is a red/black battery connection so you can jump start the car without getting to the battery.

I simply opened the bonnet. Connected the battery charge positive to the + feed on the back of the alternator, connected the negative to the body. Turned it on, immediately the interior light comes on. Turn on the ignition press the cabin boot switch and it opens the boot. Charge battery as normal. Easy Peezy

Hey John,

This is very common, because your battery is dead your remote isnt going to work. So what you have to do is look by the license plate light bulbs, their is a key hole wear you can insert you key and open the trunk to charge/ or jump start your battery