Factory NAV Experts step inside please :-)
Hope this helps.

Per your image above, the one of the left is X3:

The next one is X1:


The next one after that is X2:

The last two are for the GPS antenna (top) and OnStar (bottom).
Here's the rear of the 2011-2013 Corvette NAV radio. Everything is the same expect for the addition of the USB plug:

Here's a good thread for GPS antenna pictures, etc.: http://forums.corvetteforum.com/audi...uipped-c6.html
X3 seems to be connecting the cellular microphone. Is that the same as the mic used for onstar? Where does the wires go to (from the radio)? What function will I lose if I don't hook up X3
Again thanks for the info.
You'll lose the ability to use the voice command/control feature of the NAV. I think that's about it.
I'll look up where they go later.
I cut the 12” wire lead from the GPS antenna in the middle (appox 6”) The wire is a single lead, shielded braided wire.
Picked up a 24” piece of aircraft quality 18 gauge shielded wire.
Spliced the 24” wire into the middle of the wire lead.
Now I have a 36” wire lead from the GPS antenna like I should have and I can mount the GPS antenna in the factory location.
You will need special tools and splice parts to carry the braided shield path through the 24” patch wire.
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Why did it works with a Corvette unit but not with a Pontiac unit!? Weird
If you know where to get the original length antenna, please let me know.
This is the only model I can get:
ACDelco 15821030 Antenna Assembly
I got it on Amazon by the way.
Last edited by cheezehead; Jun 22, 2013 at 11:20 PM.
I've attached a picture of the finished GPS antenna with a 36" lead.
I've attached a picture of the finished GPS antenna with a 36" lead.
Thanks
FYI: Pin #3 and pin #5 on radio connector X3 seem to branch out in a Y fashion for two different circuits.
Pin #3 (circuit 655) goes to the inside rear view mirror connector pin #10 and the VCIM (Vehicle Communication Interface Module - think OnStar box; located under/behind the radio held by 3 bolts) connector X2 pin #9.
Pin #3 (circuit 5149), the other part of the Y, goes to VCIM connector X3 pin #2
Pin #5 (circuit 1705), which is a bare wire, goes to the inside rear view mirror connector pin #2 and VCIM connector X2 pin #10. Remember that this is a bare wire (exposed) used for shielded ground.
Pin #5 (circuit 5152) goes to VCIM connector X3 pin #4.
VCIM connector X2 is a 12-way connector:

VCIM connector X3 is a 16-way connector:

The inside rear view mirror connector is a 16-way as well:

For pin location purposes, remember that these are front views of the connectors and not their rear views.

