ForFour - How to change tail gate microswitch?

My tail gate won't anymore open! How to open it?

How to open the trunk door when microswitch doesn't anymore work please refer to this video:

1st. way: Pick-locking trunk door open from inside without taking off plastic cover

- Get a small flat screwdriver

- Put it between the lock hook and the lock (like in video)

- Push the screwdriver gently until you hear clack from the lock

- Push the trunk door a bit until it jams into second stage

- Put the screwdriver into the lock from inside the hook loop

- Push the screwdriver gently and also gently push the trunk door until it seems to open

- Pull the screwdriver out slowly while also pushing the trunk door

- Voilá!

2nd. way: Pick-locking trunk door open from inside when plastic cover has been removed

- Get a small sturdy screwdriver that doesn't bent or something similar

- Push the black arm towards the white arm

- Voilá the lock opens

3rd way: Jump wiring lock open

- Get a paper clip

- Remove the microswitch plug from the microswitch

- Insert paper clip into the plug's holes

- Push the trunk door open

- Remove paper clip from the plug

How to remove the trunk plastic cover?

- There are two T25 torx-screws behind two small caps. The caps are easily removed with a flat screwdriver

- Unscrew torx-screws

- Pull the cover from top until it you hear 4 clips popping

- Push the cover upwards

- Watch out angry spiders!

How to change the microswitch?

So to remove the microswitch you need following tools:

• 10mm wrench (rear wiper motor, inside bolts)
• 13mm wrench (rear wiper arm bolt)
• 21-23mm wrench (not sure on size, rear wiper motor outside nut)
• T25 Torx screwdriver (tail gate plastic cover)
• T20 Torx screwdriver (microswitch)
• Small paper clip or small jump wire (for testing if the microswitch is faulty)
• Small wire cutter or knife (microswitch)
• wooden mallet, wrench, or similar tool for gently hammering (microswitch)

How to get to the microswitch:

1. Open the tail gate and remove the plastic cover, refer the guide given above
2. Remove the microswitch cable (small one behind the rear wiper motor)
3. Test with a paper clip is the microswitch faulty, if you heard lock opening == faulty microswitch
4. Order new microswitch from Mercedes (code: A), new one costs just 21€, you cannot repair the old one
5. Plug the new microswich into the cable and test does it work
6. Remove the rear wiper motor
7. Unscrew the microswitch (T20)
8. Cut two small plastic hooks with wire cutters. The microswich doesn't work anymore so you don't need those anymore.
9. Gently tap the microswitch a few times at plug area until it starts moving. There is a tiny amount glue / sand etc jamming it in place
10. remove the old microswitch
11. Push the new one inside, the hooks guide themselves easily into correct position
12. Fasten the screws
13. Connect the cable
14. Test
15. Put the rear wiper motor back
16. Put the cover back