95wht6spd

Recently horn has been going off when just sitting in driveway, sporadically. Also, sometimes when I drive, the locks cycle, especially when I hit bumps, sometimes just constantly.

I had to pull fuse on the horns I just fixed and replaced so it doesn't keep going off and kill battery.

Very annoying, any ideas what the cause could be?
thanks

antfarmer2

Pull the plungers on the door switches all the way out then shut the door to ajust.

RollaMo-LT4

Yes, the door switches.

The security system relies on knowing if the doors are open or closed.
Those door switches give it that information.

The locks cycling when you hit bumps is another indication of the switches being out of adjustment or not making electrical contact

ddahlgren

Can the door locks also have an effect?

RIC96

If it was the door switches, wouldn't the cabin lights be flashing on and off? Do you have an aftermarket alarm system? If not, disable the factory system with the key fob and see what happens.

95wht6spd

I checked the switches, but will check again and lube them.

No, stock system. I will try disabling too.

It seems I had this years ago, but don't recall what happened... I remember the switches, but not sure if that was it at the time.

antfarmer2

Don't lube them pull them!

antfarmer2

Yes they will make them spastic.

95wht6spd

Shouldn't you lube it, then pull it?!

95wht6spd

I checked the door switches, and pulled them all the way out. I didn't realize the little plunger in the main push button also can come out more. I closed doors, and of course they pushed in, but I guess that is way to keep them adjusted just right.

Battery was dead again, so charging now. Will see if it works once charged.

ddahlgren

I thought there was a difference as well as to how you locked the car at least on a '91 as in use the switch on the door panel vs. the key from outside or just pushing the slide back by hand. There is so much info out there that sometimes agrees and sometimes contradicts it gets hard to keep it straight.

antfarmer2

might want to load test the battery.

95wht6spd

Now the light says Door Ajar when they are closed. Pulled out the plungers but no go.
The security light keeps flashing, and if I hold down fob button locks cycle, but only open, not to lock, and lights stay on, and can't seem to get PKE activated. I had to disconnect battery.

So it seems like the door switches are not working correctly and telling the system the doors are closed.

Any suggestions?

RIC96

Looks like you've got two problems now. At least one of the door switches is hosed, as evidenced by the cabin lights, door ajar and security light as well as the original problem with the security system and the locks cycling. Even though you can get the locks to cycle with the key fob now the alarm will not activate if it thinks the door is already open, nor will the PKE work. I'd address the switch problem first then disable the security system to determine if that's the cause of the horn blowing and the door locks cycling.

95wht6spd

Odd thing is door light didn't come on until after I messed with the switches. Security and PKE were working until battery died and I recharged. I am thinking the same as you RIC96, one or both of the door switches are dead or on last leg.

RIC96

If the horn was going off when you were parked in the driveway with the alarm activated, the door switches were the logical assumption. I focused on the fact that the door locks were "cycling" while you were out driving around. If you open and close the door when the ignition is running, the system will automatically unlock the doors to make sure you don't lock your keys in the car. If the doors are already unlocked it will still "try" to unlock them. That might be caused by a bouncing door switch. This is in contrast to the locks "cycling" as they do when you activate the PKE. In this case when you hold the button on the fob the doors will lock and then unlock, indicating the system is now active or inactive. Which symptom were you seeing when driving around? In any event you need to fix the failing or maladjusted door switch before troubleshooting the original problem.

antfarmer2

You can change the switches without pulling the pad. Keep the screws in so you do not drop the back plate.

95wht6spd

The locks have not been cycling when driving yesterday after I charged battery, but the Door Ajar light was on so maybe that prevented.

95wht6spd

Pad? You mean the door panel?
Now that you mention, this seems familiar, maybe I messed with the switch years ago, I recall doing something around that area and trying to keep something from falling down. IDK so many projects over the years on 2 Vettes.

95wht6spd

Found a video. Like I mentioned, pretty sure I did this years ago, as I recall having this issue, and working on the door. I guess I replaced and fixed the issue. I am going to work on it more and see if it can be fixed, if not I will buy a switch and hope that fixes issue. I guess it is most likely the drivers door since that is used 99% more than passenger side.