kenwood dnx6140 display problems

[sea5003]

Need some help... I had the Kenwood DNX6140 installed professionally a few months ago and everything works fine... except there is a lock out so DVDs cant be played while the parking brake is off. To bypass this, today I got behind the unit and grounded the parking brake wire from the unit. I turned everything back on and now I can play DVDs but picked up another problem... when i go to the Navigation screen, the whole display goes very VERY dim, and you can barely see anything.

I'm not sure what could have affected the screen display while in the navigation, was wondering if anyone else has had this problem or has any suggestions?

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