polar start, 2005 gmc sierra

hey guys, (this may be in the wrong section, if so please move it)

im new to this board but did find some usefull information during my search, and have a question that hopefully someone will be able to answer.

I have a 2005 GMC Sierrra, Duramax, and i have a Polar start PS-4461TWE already in the truck.  It works great.  I recently purchased an Edge Insight unit.  The edge unit is not working properly in my truck.  I called Edge up and they had me plug the unit into the computer which tech support downloaded the data from the unit to analyse.  the answer that i recieved was that the car starter was sending a signal down the (purple) wire to the ODBII port which was inturupting the signal to the diagnostic unit. 

I have the dash of the truck pulled apart, have found the "purple wire" to the ODBII port which a wiring diagram i found on the web says is the "Serial Data Signal"  there are no wires from the starter attached to this (that i can tell)   

what i was hoping was that i could put a switch onto the wire sending this signal that would allow me to "break" the wire for the starter while i was driving and use the Edge unit, and then flip the switch back while i wasnt using the unit so i could still use the starter. 

My research is showing me that this is quickly becoming not that simple.  does anyone have any suggestions of what i can do so that i can use both of my "toys"

to save you guys some time here are some of the wiring diagrams that i have found.

Starter wiring diag. - http://dealers.automobilitydistribution.com/webapp/e-cellsell/e-commerce/webb2b/IC5/Techsupport_install_guides/POLARSTART/PS4461-TWE%20(2009)/PS-4461_qg_en_h50s50_090812.pdf

truck under dash wiring diag pg 18 - http://alarmsellout.com/support/diagrams/vehicle/GMC%20SIERRA%201988-2005.pdf

Thank you in advance.  Blair

The only difference between genius and stupidity.... Genius has its limits

Use the status output or ground when running via a diode to a SPDT (5 pin or 87a) relay to disable the Edge during remote start until key takeover, see if that works. Either that or a wire was missed on the original install.

Thanks Howie. I wanna go the other way though, I would like to disable the starter once I have key takeover if possible. The edge unit only has a plug to the odbII port. And oddly seems to "communicate" with the truck more consistently if I start with the starter first. However it still won't let me run a balance rate test (the main reason I bought the unit) because of communication issuesThe only difference between genius and stupidity.... Genius has its limits

One more question. Roughly how long could I have the power unplugged from the unit before it loses its brain and I need to reprogram it?The only difference between genius and stupidity.... Genius has its limits

If you're talking about the R/S, forever because it has a non-volatile memory bin the edge because it doesn't seem to do what you want any way.