If your horn is sounding, it seems like the car thinks that there is a door still open. Does your interior light go on and off as normal? I'm thinking it could be a corroded door switch....
This is the harness I had. The black plug connected to the vehicle's wiring loom, and the end with all the bullet connectors connected to the appropriate wires coming out of your head unit. All the wires are labelled so you just match them up to the head unit's wiring diagram - I think the...
Go speak to the guys at Autobarn. It's been a few years since I did mine, but I think there was an additional adapter to make the steering wheel controls work. It wasn't cheap, but I did buy it and it worked flawlessly.
Number two could be your driver's door solenoid - apparently there's a microswitch in it that tells all the other doors to unlock/lock. When that fails, none of the other doors receive the info to perform the same action.
Number six, does the seatbelt try to retract at all? I've heard that the...
The factory amp isn't that bad really, I just got one of those Aeropro adapters when I put my Alpine unit in my WK.
There are actually two antennas in the car, the one you can see and another one in the rear window I think. It's supposed to help reception. I believe you can just buy adapters to...