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When you push on the key fob does a little red light blink?
Is this the key you have always been using?
Is your key and the fob 2 separate pieces. Or is the fob attached to the key.
Also did you say the key or the fob was a spare.
Do you have another key.
If so try to use that and see if the alarm stops working.
If this seems to work, disconnect the battery for 10 minutes then try to reuse the key that is setting off the alarm. Remember you need a radio code to turn the radio back.
Be sure not to push the fob buttons after you disconnect the battery before you try to use the key.
Let me know how you make it out
This issue is odd, typically when the alarm goes off or when there is an issue with the key transponder the vehicle won't start.
You won't be able to program the fob with the alarm going off.
Do you know if your alarm and keyless system are factory items or were the accessory add ons from the dealership?
Is there a little red LED light on top of your steering column?
Also be sure all doors and tailgate and hood are completely closed.
As far as I know the alarm is factory fitted. There is a red LED in the dash.
Ok, the alarm is factory then.
The only other thing i can think of. Is when you get in the vehicle turn the key to start position and cycle the door locks a few times.
Looks like the only option if that doesn't do anything, unfortunately at this point would be to have the vehicle taken to the dealer so they can see if the key is malfunctioning with the alarm system. Or if the alarm it self is malfunctioning. You need to use a Honda Diagnostic tablet for this, and the dealer is the only place with one.
Accepts greatly appreciated