Resurrecting old thread to add info about Automate AM1 alarm modules (Directed Electronics). I pulled the panel from underneath the steering column in my used (new to me) 2004 4runner and removed both the inline fuses to completely disable the Automate system. I may try and use it again and program it to stop honking the horn... but I'm a bit wary of it getting screwy and locking me out, so I'll probably just remove it completely. Here's a couple more links about the AM1 unit:
Automate AM1 upgrade alarm
Automate AM1 Alarm by Directed Electronics - Anyone? - Ford Mustang Forums
Here's some cut-n-paste from the above links for posterity (note I have not tried any of this... but it may help someone else):
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"I have the AM1 in a 2007 Toyota Camry. I saw your post while I was trying to figure out how to disable the horn sounding at lock/unlock because the car was sounding chirps in addition to the horn. I figured it out . So if that's what your are looking for then here goes it
Here is what I did (refer to Page 26 of the Installation Guide)
1. Open door
2. Turn ignition on and off
3. close the door
4. Within 5 seconds press and hold valet switch, after 3 seconds the horn will sound once to indicate entry into the first features menu
5. Press and hold the valet switch corresponding to feature number (press two times for chirps on/off)
6. press unlock button (you will hear 2 chirps for chirps off)
7. Release valet switch and start car"
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"I've installed hundreds of them. I like DEI, but that unit is the biggest piece of crap i ever messed with. Here's your problem. The door has to be closed for programming, but the AM1will not realize this because of voltage bleedthru on the domelight circuit of your car. It just doesn't see the door closed! Cut the door trigger wire, program it, then put the wire back together. I've also had problems with the light being the valet switch. Some genius at DEI decided to put the switch in the light, so when your supposed to count flashes and see the light on or off you can't because your finger is on it! Genius.....Anyway, sometimes the switch doesn't make contact every push so i use a separate valet switch plugged in to the blue plug to solve all this. After i program, i just plug the stupid LED switch back in for the customer."