When everything is closed and locked, the only control unit inputs that are grounded, and have 0 V, are the driver's door lock knob switch, the audio unit, DVD player, rear controller and screen, and the navigation display.
In other words, all of the other switches are open, including the key cylinder switches, and they have about 10 V. 10 seconds after the doors and tailgate are locked with the key or the lock knob (with the door open), or immediately after the doors are locked with the LOCK button on the remote transmitter, the security system arms, and the security indicator on the door flashes. If the security indicator does not flash, the system is not arming.
Realizing that your issue isn't directly related to the alarm system, it's an integral part. Is your security indicator flashing? Beyond that, the first thing I'd do is to take off the door panel and check for ground at the door lock knob switch, and then check for reference voltage at the door lock regulator.
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