Thanks! Found a thread in the end though, with the manual as well as your descriptions from before.

Replaced my alarm with a new factory one yesterday.

Like you said, it was located under the fender. A bit tricky to reach the bolt holding it in place and putting it back together. And took me a while to figure out how to seperate the harness connectors (but I'm not that mechanically gifted).

Put it together and it works, kind of. The remotes started to work after some fiddling. After a while one of the remotes worked and the other intermittently.

Seemed similar to the situation I had when things started to work again after the glitch I had previously with the old alarm.

I will try to replace the batteries next to see if that helps the situation.

Installation works glitch-free now, both remotes works just litke they are supposted to.

Just hoping everything lasts... I'm a happy camper!