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Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
The navigation GPS antenna is a roof-mounted combination antenna that also receives satellite audio and cellular signals. To disable it you will need to access it and unplug it. Follow these steps to remove the headliner https://dl.dropboxusercontent.com/u/90220402/headliner.pdf to access the antenna plug to unplug it.
Thanks for using Just Answer, and rating me so I am compensated, Chris
There is not a stand alone GPS antenna. Many are incorporated into one in the roof. You could try just removing the wires from the antenna for the GPS to see if the other antenna functions remain. Would you like to try that?
Hello again Chris here,