take the van to your local dealer and have the horn cherp option enabled in the body computer or chech one of the techs walking in the back door and offer him 10$ to do it for you
Absolutely!
It was optional.
Dealer item.
Your kit should include instructions.
Break a window or call a locksmith
That requires the dealers scan tool.
If the key has the built in remote buttons, it has sentry key.
The factory alarm is reset by unlocking the doors with a key or remote.
You ask if your friend has one
The factory alarm is disarmed by unlocking the doors with a key or remote.
The battery in the remote may be dead, or the remote or security system may have a fault of some sort.
behind the ignition switch they go bad often