What causes system 3 panel to into alarm when a ground is applied, even though there is no ground on panel

Do you have an air bag light lit on the instrument cluster ? Do you have C.C. button's on the steering wheel , do they work ? If the alarm fob (as u call it ) Can make the horns sound , the relay is sending B+ voltage to the horns Don't know how your testing.
System Description
The horn system consists of the following components:
• Horn fuse
• Horn relay
• Horn switch
• Horn(s)
• Body Control Module (BCM)
System Operation
The vehicle horns are activated under the following conditions:
• The horn switch is depressed.
• The body control module (BCM) commands the horns on. The BCM commands the horns on under either of the following conditions:
- When the content theft deterrent system detects a vehicle intrusion. For further information, refer to Content Theft Deterrent (CTD) Description and Operation in Theft Deterrent.
- When the panic button is depressed on the remote control door lock transmitter. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.
- When the OnStar® system is used to sound the horns, if equipped. For further information, refer to OnStar Description and Operation in Cellular Communications.
- When the keyless entry system is used to lock the vehicle, a horn chirp may sound to notify the driver that the vehicle has been locked. The notification feature may be enabled or disabled through personalization. For further information, refer to Keyless Entry System Description and Operation in Keyless Entry.

Circuit Operation
Battery positive voltage is applied at all times to the horn relay coil and the horn relay switch. Pressing the horn switch applies ground to the horn relay control circuit. The body control module BCM may also apply ground to the horn relay control circuit as described above. When the horn relay control circuit is grounded, the horn relay is energized and battery positive voltage is applied to the horn(s) through the horn control circuit. The horn(s) sound as long as ground is applied to the horn relay control circuit.

No one here.

Well that kind of sounds like a bad connection, but it was difficult understanding with no good punctuation... Have you checked the battery terminals? If not, do so, and have your alternator checked too. I've seen some really goofy stuff happen when some vehicles don't get enough power.

You have to apply a negative pulse to the wire DARK GREEN/PURPLE located at the Low Drivers Kick Panel. Get a piece of wire and hook one end at ground and the other side just touch the dark green/Purple wire (you must cut just a little bit the wire shell until it shows the copper wire) DO NOT CUT THIS WIRE, JUST PEEL IT. once you apply a ground pulse to this wire the alarm will disarm and you ready to turn the engine ON but after you turn the engine off again the alarm becomes ON, so if you like to keep disarmed leave the ground wire connected to the Dark Green/Purple wire and when you fix the problem just disconnect this wire and you back again at the start point.
LOW DRIVERS KICK PANEL is where you put your foot at the left side against the wall

Hi,
Here's what I think but you will have to check it out...
The fan motor in the 39 heater is a 120V fan there fore it cannot be hooked to the 240 which potentially could have the high (wild) leg as one of the fan legs...
The 240V 36 unit probably has a 240v fan motor....
Now if you were to make sure that the leg that fed the motor was a 120V to ground leg then you will be okay...
Hope you understand where I was going with this...

heatman101

I would suspect the problem is with the aftermarket alarm. I would consult the manufacturer of the alarm and see if there are any problems with compatibility with the OEM alarm.

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Is this a factory alarm? If this is the case you have to apply a negative pulse to the wire color. Light Green/Orange located at the Driver’s kick panel as soon you apply a negative pulse the alarm will be disarmed and if you want to keep disarmed for ever just hook a wire to this Light Green/Orange and connect it direct to ground this way will keep always the alarm in disarm mode

Sounds like a bad ground somewhere... check all the wiring under the hood, make sure everything is tight. A bad ground can cause all sorts of weird problems.

An "earth fault" or ground fault is a condition where one of your circuits is grounded or shorted to earth. While all fire alarm systems are normally grounded for circuit board overload protection and personal safety issues, all circuits (bell circuit, smoke detector/heat detector/pull station circuits) should be free of earth grounds. I would suggest if you are not knowledgeable enough to troubleshoot your system you should contact a security/fire alarm installation company to fix the problem. If this is not a viable solution and you want to attempt this on your own try removing each circuit from the panel one at a time. While this will certainly cause additional system troubles, when you remove the circuit causing the earth fault the condition will disappear. You will then need to check all wiring, spice points and devices on that circuit to determine the faulted location.

The most likely causes in their order of probability are: 1) water somewhere in the circuit causing the hot wire to ground; 2) a legitimate trip caused by a defect in a device plugged into the circuit; and 3) a defective GFCI breaker. In the first case, wait until it has been dry for about a week and see if it trips. In the second case, make sure there is nothing plugged into the circuit and try resetting. In the third case go ahead and put the regular breaker in, then put a GFCI outlet into the first box downstream from the breaker. If installed according to the directions, that outlet should protect all of the outlets downstream.