4 short on Lock via FOB or keypad
2 short honks on lock

I keep trying method found elsewhere on another site that worked for a few days but suddenly is not working anymore. No matter how much wd-40 I spray into the door locks and hatches along with the subsequent door slamming I do (4 each), I am getting the 4 short honks on lock and 2 on unlock again. There is no "door ajar" light and interior lights go off as normal so it doesn't seem to be door open sensor. All doors lock as well. Hood checked. Don't know what else it could be at this point and am about to disable the horn out of frustration.

Ideas?
Any help much appreciated.

Thanks,
Lane87
2003 Expy XLT 5.4L
187k miles - Still clean and runs strong

 

If a door, or the liftgate is ajar, you will get 2 quick chirps from the horn when locking, not 4. That means there is a different problem other than a door ajar or a bad ajar switch. I don't know what the 4 chirps mean other than possibly the programming of the FOB to your on-board security module was lost

 

Further investigation has turned up some interesting things.
1. It is now an intermittent issue. 1 day no problems (usually a full day) another day honkville.
2. Walking across Home Depot yesterday and I hear another truck with the very same sounding 4 honks. Then the guy turns around to get something and I hear the 2 honks on unlock. newer model F-150. I ask the guy about it and he says "the dealer said the alarm needs to be reset and it had something to do with the mechanism that makes the parking lights flash when it locks". He said it was too pricey to fix so he just deals with it.
3. When not doing the short honks, my Exp flashes parking lights once on lock and nothing on unlock. Not sure if that is normal operation but assume it is. When honks present, 2 lights flash on lock and 2 lights flash on unlock.

I think Home Depot guy has given me a good clue. I already tried "resetting" the alarm with battery disconnected and terminals shorted together for 10 sec. No difference except sequence is now:
Lock - 4 honks 2 flashes
Unlock - 2 honks 1 light flash.

Going to have to find where this circuitry for making the parking lights flash is. Probably the alarm itself?

 

Found this elsewhere on here for an '08 Expy:


For future reference.
2 honks = Hood is open or brake is depressed
3 honks = One of the doors is open
4 honks = Tach is not programmed
5 honks = Key is in ignition
6 honks = System is in Service/Valet mode

No Tach on an '03 so it must be something else. Wish I could find the '03 version of this!