Hmmm...Ok zone 4 is the multiplexing input, which is a negative trigger to a blue or green wire on the alarm. Usually this is hooked up to a hood pinswitch, or the hatch pinswitch. Do you have any other sensors installed with your alarm??? motion, glass breakage, ect...??? If you can get at your alarm brain, find out what is connected to your blue wire coming from it, since that is zone 4. You can also defeat this zone through your transmitter when you arm your alarm. Push the button to arm it, and within 5 seconds, press the same button 2 more times. The siren should chirp 3 times, and this means that zone 4 is now bypassed, that is until you disarm and rearm again. See if that works...

13.5 @108 MPH-2.2 60ft(stupid FWD!)
S16G @ 18 PSI/FMIC/Running on MegaSquirt II (Now with sequential
fuel injection)
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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)