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The attached note is from the Owner's Manual under Sentry Mode. From my experience, the same distance applies to Walk-Away Door Lock. And it's 500 meters as the crow flies, not as you would drive.
I got the "Park Assist unavailable" message yesterday when I put the car in reverse after driving 14 miles in the rain. The message did not display when the car was in drive. I noticed the rear camera was covered with water droplets, so I dried off the rear camera and the the message did not...