How bad does your neighborhood look? Maybe you really *are* in Detroit!
Sorry. Couldn’t resist that one.
I don’t have NAV, and I’ve got a 2011(so maybe somewhat different) - and I’m cramped for time here (gotta get to work), but my Helm Manual says the NAV antenna is the one on the roof. There are actually 2 more antennas in the rear window glass for AM/FM, and the schematic shows 2 coax cables from a “K46” Radio Antenna Module going into the radio unit.
The only thing showing up for “Navigation” in the Index (and these Helm manuals are famous for deficient Indexes ... I’ve added numerous entries of my own along the way), is for a “Navigation Signal Splitter”, which is a small box, sitting vertically, held in with 2 bolts, under the driver’s side knee bolster, above the brake pedal. The manual says “Disconnect the electrical connections”, so it has a couple of wires plugged into it.
The knee bolster is just the flimsy plastic panel held in with either 4 fasteners (Nox), or 2 fasteners (Terrain).
But personally, I think your system is working, it’s just confused as to where it is. I think you’ve got either a configuration problem (lost its “home” position), or your software got updated or needs another update (now) ... for whatever reason.
Good Luck! I gotta run ... really late now!!
There are also DTCs (OBD Codes) like "B125C" which would indicate a indicate a Satellite Antenna 1 Circuit Short to Battery, or Ground, or even an Open Circuit.
Wait ... THIS might be what it is: The "Communication Interface Module". A dealer scan tool (sorry, I know) is capable of reading the status of this module. Things like "GPS signal present YES/NO", Signal Strength (a number between 0..100, but "68" is expected, for some reason).
This module is located very close to the Splitter behind the Knee Bolster. It's a rectangular box with two bolts on one short end, and one on the other short end.
As for the routing of the antenna cable, it's depicted as coming off the antenna, going toward the liftgate, then looping back, along the roofline, on the passenger side, where it turns left, and goes through a hole above either the driver's seat or pillar between doors, then down to the dash and into the Communications Module, Splittler, and Radio.
2011 Equinox 1LT (new Jan 2011): Summit White / 3.0 L V6 / FWD / Pioneer Stereo / 18" Wheels / 131.6k miles [14-JUN-2019]
2002 Impala 1LT (new Jun 2002): Summit White / 3.4 L V6 / FWD / Cassette-CD Combo /222.5k miles [13-JUN-2019]
Last edited by Colt Hero; 07-23-2019 at 08:06 AM.