: Phone antenna?

06-10-13, 04:20 PM
I have a 2004 that seems to have been upgraded to the 2005-2007 digital OnStar unit (I checked the p/n on it, it listed as 2005-2007). Everything works, but I can't get the phone to work at all. The unit in the side of the trunk still has a coax connection to the stupid glass-mount antenna.

Do I understand that the 05-07 used the sharkfin on top for both OnStar and phone? Can I easily find out what I have up there, if this is true? The only pic I can find seems to have three connections to the sharkfin:


Is one of these some kind of cable to the OnStar box for the phone connection?

Yeah, one of these days I'll do the whole bluetooth thing, but right now I'd be happy to sort this out.


06-10-13, 09:00 PM
Attached is about all I have that might be of help.

06-11-13, 09:20 AM
Thanks! I'll see what I can figure out.