After a smooth trouble free year after my first ever carputer install I had to crack the dash open again for something relatively unrelated and decided that while I was in there I would go ahead and look into finally finishing this project. And since my free year of OnStar was up, I no longer needed to leave all the hardware intact for them. Which means I am free to utilize my factor onstar hardware. After hours of scouring the web trying to answer:
- What type of connector does my G4 GPS antenna use
- What type of connector does my onstar GPS antenna use to connect to the VIU
- What gender are the two connectors
- What is the correct power needs of the G4 GPS antenna and OnStar antenna
- What type of cable would I need
- Where in the world can I find one without spending $50
I finally came to the conclusion they both are MCX 3v (3-5v for the G4, according to the magnetic side of the antenna)
So all I needed was a short male MCX to male MCX, found these and ordered one today.

I ordered the first one for $12+shipping from
cableorganizer.com out of FL and I'll give it a shot when it comes in. For such a small order, their customer service was off the hook walking me through my best option and finding me the shortest (READ:cheapest) cable for my install. I hope it works, time will tell. I'll post and update including GPS status change switching from one to the other (not expecting one, but can't hurt to look) after the cable arrives and gets installed.