IN Lexi Posted April 20, 2013 Posted April 20, 2013 My 2005 RX330 recently began displaying a HARNESS DEVICE MOUNT message in the Nav display upon turning the vehicle on. Nothing has been done to the vehicle recently, other than an oil & battery change about 2 months ago. I first noticed the message pop-up about 2-3 weeks ago. Is anyone familiar with what this message means? Or how to fix it? Thanks!
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