clifford 50.5 and dei 530t

also can you hook up the orange wire from the 530t  to a aux channel such as 4 or 5 and use that to roll the windows up?

is the module supposed to be set to - polarity for a 2004 silverado

If you aren't using orange wire for anything else no diode needed. Other aux outputs can be used to roll down windows slightly (ie VENT). If you wanted to actuate the indow close facility independantly of arming the alarm, use another aux set to time it takes to close the windows + 2 secs, ie as a timed output. 2nd question, don't connect orange to any other aux outputs, third question, what do you mean by polarity? If this refer's to triggering the 530, use neg.

Correction re the polarity question, I've just been on to directechs trade site and looked at the wiring etc. If you have a later version with the dip-switches, leave switch  5 OFF as in pos (+) setting