I can't tell you how to disable it. But there should be some way
to reduce the sensitivity. This adjustment should solve the
problem.

Also, I want everyone on this planet who has a car alarm to learn
how to set their alarms without making so much as a peep of
noise, and also have their alarms reprogrammed for "silent
arming." Having rented cars recently due to a car accident, I'm
incredulous over the stupidity with which the American car alarms
have been factory-programmed. It goes like this:

When you unlock the doors with the remote, the headlights flash
to confirm the unlocked status. However, when you lock the doors,
the only indication is that the domelight flashes. It's a
certainty that no human will see the domelight from outside the
vehicle, even at night. This encourages the car owner to press
the remote button a second time for confirmation; this second
push blows the horn and bothers other people in the neighborhood.
I rented a Ford that was set up this way, and I found that GM
does the same thing. I believe that the Hyundai that I rented was
set up differently -- it flashed the headlights upon arming: much
better.

Richard