Pelican Parts bought a 2001 C320 (W203) project car from an online auction, sight unseen and with no warranty or promises of any kind. When the car arrived one of the first things I found wrong was that the trunk would not open. I was hoping some of the missing engine accessories would be in the trunk so it was imperative that I get it open.
Next I began the process of elimination, the electronic key would not work, the trunk switch on the driver side door did not work and the mechanical key didn't offer any help. After checking all of the usual suspects and eliminating electrical issues, I came to the conclusion that something was broken within the latch/lock mechanism that was jamming the trunk closed. The other problem was that the car did not have the split rear seat and absolutely no way to get into the trunk from the inside of the car.
If you have tried all other options from jumping up and down on the trunk to boosting the battery and find yourself with a stuck trunk and no way to get inside it to open it here is what I did.
First disconnect the battery and secure the ground cable so it can not make accidental contact with the battery while working.
The next thing I did was determine that I needed to get access to the cable that goes from the locking/latching mechanism to the lift handle in the hopes that I could physically pull the cable and get it to release. At this point I was hoping the cable had broken off the lift handle portion and I just needed to be able to pull it to open the trunk. Without the ability to get into the trunk space from the cabin I set about figuring out the best way to get to the mechanism...
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Time: 1-5hrs
Tab: $0 to $400
Tools: T27 Torx bit and driver, drill, sawzall, flathead screwdriver, hammer
Applicable Models: Mercedes-Benz W203 (2001-07)
Parts Required: Depends on the extent of damage
Hot Tip: Wear safety glasses
Performance Gain: Ability to get in your trunk
Complementary Modification: New paint job on trunk
