2005 Envoy remote start

I'd like to install a remote start in my 2005 GMC Envoy.  Has anyone used the factory key fob transmitter to trigger their starter?  I was thinking I might be able to use the horn honk button to start the vehicle instead of honking the horn.  Anyone know where I'd find the right wire for this?  Also are there any changes in the 2005 wiring from the 04 or 03?  Thanks!

C'mon!  no one has done this?!?  Someone out there must know where the factory horn output is!

The setup you want to use for these trucks is the db-pass-23 and the db-dlm-3g from omega, antitheft bypass and doorlock interface, respectively. This is the setup I've been using at the dealers now for about a year and a half, no glitches, no problems. Scrap the idea of using the factory remote to trigger start, then you only get the range of the factory remote (75 feet struck by lightning). add on starter you have to run a wire into the door anyway, have to use antitheft bypass anyway, and installing a stand alone is actually easier and you get up to 1000 ft of range from base models,. My preference on these vehicles is the Ultrastart 1250 (ultrastarters.com) The cool thing about this setup with these parts is there are no wires cut, easy install and when you use this particular door lock interface, when you lock the doors from the new remote, it rolls all your windows up automatically. GM can't even offer this feature!I tell it like it is...

image6902 wrote ...the range of the factory remote (75 feet struck by lightning). i believe the proper phrase you were looking for is I.L.S. or "if lightning strikes.    but i do agree with you

I'd also suggest a stand-alone system. Easier to install, works better, and has better range. Not much of a difference in price either.