You need to use the remote to deactivate the alarm. If the remote isn't working or you don't have it you cal usually shut off the alarm by closing the drivers door, use the key to unlock the door from the outside, then open the door. Let me know if you have the remote but it isn't working. Check to see if the small red light on the remote goes on when you push a button.
No there is no password XXXXX you could use to start the vehicle. Use the remote to unlock the door, then insert the key into the ignition and try to start the vehicle. If it starts great, if not does the green key symbol in the dash flash on and off. If o the key is not being recognized by the immobilizer system. This is the only way the immobilizer works, when a key is inserted into the ignition the computer checks to see if the chip inside the key is one that is authorized to start the vehicle, if it is not the vehicle wont start and the green key symbol will flash.
Let me know how this works out.
Close all the doors, insert the key into the door lock cylinder of the drivers door. Lock then unlock the door with the key not with the remote.
Let me know if the alarm shuts off.
Is the remote working? Can you lock & unlock the doors with it?
When you use the remote to unlock the door will the alarm shut off?
Let me know tomorrow if the remote shuts off the alarm.