The vehicle came with CarPlay stock from the factory, so I believe I do have the Wifi antenna:
S609A Navigation System Professional
S6CPA Preparation Apple CarPlay
If I didn't have the wifi antenna installed, wouldn't CarPlay just refuse to work completely?
You bring up a very good point that it may be caused by head unit proximity. A lot of the time, I do bring the phone out into the cupholder, and retry, but that doesn't seem to help. Anyway, I'm spurred to go update the software and see how it works the next few weeks. The main reason I haven't is a small, latent fear that it will make me pay $80/year for the subscription, despite the MY2017 having the lifetime option.
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