My k9 car alarm system has a kill switch and somehow was activated while I was driving today. It makes a knocking sound except for when I have the key in the ignition turned on or if i push a button in my car and I can't get my car to turn on anymore. How do I deactivate the kill switch or how do I take it out?

Make sure your Battery is fully charged. A partially charged Battery can make the alarm system malfunction. Also, make sure the
regulator is charging the Battery. Some key alarm systems can
and will drain your battery if the Car is rarely driven especially
if there is a ignition kill switch wired into the system. The key alarm
system on my Mercedes 560SL used to drain my battery whenever
I didn't drive the car enough.

In the installation instructions it will describe which wire in the cars loom to reroute to alarm. Find out and rejoin this wire.
This is considering it is aftermarket alarm

Is the LED indicator illuminated steady (not flashing)? If it is, than the system is in valet mode. In order the turn off valet mode, you need to press and release the valet button once. The LED should turn off and you will be able to operate the security system.

I am assuming that you want to disable the system temporarily by putting it in valet mode. You will need to locate the valet button; they are usually installed under the dash within reach of the driver. The button should be black and about 1/2" in diameter.
Pressing and holding the button for 3 seconds while the alarm is disarmed will put the system into valet mode. The system will turn the LED light on steady and chirp the siren to indicate that valet mode has been activated. To exit valet mode, press and release the button. The LED will turn off and the siren will chirp to indicate that you have exited valet mode.

The included link is for the manual, see page 8.
http://www.caralarm.com/manuals/K-9/K9-Mundial-ss.pdf

You need to adjust the tachometer sensing wire, it usually wraps around a spark plug wire so I can sense when the car starts. On my spy alarm, the wire was grey. Hope this helps.

put key in ignition switch leave in the off position, press the remote starter, if your car starts it is the transponder system it may need to be adjusted

There is NO kill switch on the 2000 Elantra... HOWEVER, there is a thing called the Key Fob (keyless remote entry system). There is, however, a system in place called the 'starter kill' circuit and it is activated when the burglar alarm goes off.... it's called the burglar alarm relay and it is activated to prevent the engine starter system from being used. There are three ways to get the engine started in such a circumstance... 1. use the key fob to 'disarm' the system... 2. put the key in the ignition and turn it to the 'RUN" position and wait until the alarm stops (horn stops beeping and the parking lights stop flashing), then the engine will start.... 3. pull the starter relay from the UnderHood junction box and bypass the starter circuit (key in ignition and in the 'RUN' position), jumper the starter solenoid circuit to energize the solenoid to start cranking the engine -- it should start then.

Contact K9 directly and ask them if they could send you a user manual.

Alarm Disarm LIGHT GREEN (-) DRIVER'S KICK PANEL

try pulling the relay or fuse out for alarm system.if it starts then replace fuse or relay.if it still doesn't start then your alarm system has a control module that needs replacing.