Since no one posts in these forums on these old threads, I thought I would give an update in 2025 on this problem to help anyone else out. It took me 3 nights of like 6 hours lying across my ute front seats probably getting a hernia to get mine open. It depends what your problem is as to how to fix.
Mine the mechanism was completely shagged, so it was stuck locked and couldn't unlock no matter what. Even pulling out the inside handle as per some guides to give it some force on the lock and handle opener to no go. Once I got the lock out later I can see why this didn't work as its completely shagged.
What worked for me was pulling away the inside door seals which opens a small gap that you can see into the striker with a torch. its awkward as fuck because most wire is too stiff or too loose or too thick to get in there and activate the mechanism to push DOWN and open the door on the bottom of the locking mechanism.
What finally worked for me was getting a piece of high tensile flat stainless steel wire from a coathanger at woolworths thats made for hanging shorts or pants with the press to open aligator style clips. Its flat bar and i was able to get this in and over or under the black striker and push down because it would bend but not stay bent, it was like a spring. THIS WORKED after hours of furiously spamming it around in there and the door popped open.
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Screenshot of the coathanger that worked.
Practice lots on the other door and remember the striker locks TWICE. I spent ages thinking i was doing the right thing on only the first click.... which puts the striker in a different position to fully locked.