Car alarm goes off randomly when I unlock the door.

[Greek]

OK gentlemen, I took the panel off a while ago and got nowhere. I have noticed though, that the alarm goes off even before I open the door. I'll unlock it, and right as I'm about to grab the latch it goes off.

When I had the panel off, I couldn't find any blue or orange wires or anything as someone else mentioned. What exactly should I look for, and what exactly should I do? I've had about enough of this douche baggery.

 

[te72]

Try unlocking the car from the passenger side only from now on. Had this same issue with my 88. Unlocked it from the passenger side, never had the problem again.

 

[jetjock]

...I have noticed though, that the alarm goes off even before I open the door....

Was there something about post #10 you didn't understand? Was it all Greek to you?

 

[Nick M]

It must bring the cancel input to ground *before* the switch in the solenoid/latch brings the trigger input to ground.

Where do you find these books? Did you come across them just randomly in the EE business, or did you hunt them down? A great deal of information you put out is often not in any Toyota publication. And I have a nice library. And I don't mean the repair manual.

 

[Greek]

Was there something about post #10 you didn't understand? Was it all Greek to you?

OK, so what exactly should I do? The cancel switch has to be ground, that doesn't really help me much. Which is the cancel switch? I took a multimeter to the plastic piece where a lot of wires attach to and I'm not getting any current. Yet somehow all the electronics in the door work.

edit-Also, read my signature. I'm trying.

 

[jetjock]

Where do you find these books?...

Books? Lol. No books involved, at least not in this case. Forgive a lack of modesty but that it works in such a way is, just from looking at the EWD, intuitively obvious to someone with my technical background. Remember, I didn't just fall off the back of the turnip truck yesterday. Besides, it's an old car...not the Space Shuttle.

OP: Read post 13 again...

 

[Sullivan]

The cause of this almost always the cancel switch on the lock cylinder. It must bring the cancel input to ground *before* the switch in the solenoid/latch brings the trigger input to ground. And fwiw the actual opening of the door has nothing to do with triggering the alarm eg; the jamb switches are not connected to the system. It's one of the things that makes the factory alarm a halfway decent design.

Do you have any idea what the time delay between the two needs to be?

I have an aftermarket alarm - it sometimes, but not always, triggers the factory alarm when I unlock the doors. My previous aftermarket alarm had a second output that was wired to the "alarm disarm" line, and was configured to pulse a moment before the "unlock" pulse. This alarm doesn't have that. But it would be easy enough to kludge up a little delay circuit.