Hello and welcome to Just Answer!
The only way to disarm the alarm system is with the RKE transmitter or cycling the key in the drivers, passenger or liftgate key cylinder. If this does not work you will have to get a scanner put on to see if the body control module is locked up. The body control module is what controls your security system.
Note: this only applies to a vehicle equiped with a factory security system and if you have an aftermarket one you will need to find out what kind and contact the manufacturer for troubleshooting. I hope this helps, let me know! Thanks, Richard
There is no diagram to send. It is all controlled internaly within the BCM. There is no "cut off".
If your key can't disarm the security system by unlocking any of the doors than there is a problem with the BCM.