The Beaver owners manual is all I have, and it only talks about customizing the unlock and program codes, and restoring them to factory default. It says the keyless entry "Lock" button locks both the entry and bay doors, which is true with the "Locked padlock" icon button on the key fob. However, you should understand that even though there is a "Cargo Lock" button on the key fob, it does not operate on the Monterey models. If that is the button you are trying to lock your bay doors with, that explains your issue there. To lock the bay doors with the fob, you must use the button with the locked padlock icon, then hit the unlocked padlock icon button if you want the entry door open and bays locked.
Pain in the neck, but reckon we would have had to splurge on a Marquis to get a working Cargo Lock button. Go figger.
In the same vain, we discovered that even though you're supposed to be able to hold the keyless entry's 3/4 button and get the patio light to come on, that feature isn't activated in the Monterey either. Would be nice coming home on a dark stormy night trying to see the locks.
-Joel