791XV Dual Polarity Door Lock Question

I installed a Viper 791XV on my Infiniti G35 and everything is working great.  But I have a question on the dual polarity door lock wires. Since each wire puts out both a positive & negative (+ lock & - unlock for one wire and vice versa for the other), wouldn't there be a short if the alarm was trying to lock the doors while I was unlocking them from the car at the same time?

I thought a diode on each wire would prevent this, but when I installed them, I noticed strange behavior.  The locks would work fine until a couple of minutes after arming and then they wouldn't work.

Since this car uses extended pulses on the lock wires to raise and lower the windows, I would think there would be a greater chance of putting + and - on the wire at the same time.  i.e. if I have a 10 second neg. pulse on the lock wire rolling the windows up and I disarm during that time a + would be sent out on the same lock wire.

Thanks,

~John

It's a 2004 Coupe.  I've connected the blue & green doorlock wires to the drivers door key cylinder switch.  I've also connected the channel 4 & 5 wires to the same wires for windows up/down.