replace back light in navigation system What is your question?
no front screen display, but radio, nav system work
What makes this problem better or worse?
no system display
How long has your 2009 Toyota Highlander had this problem?
several days
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What are the best Toyota repair shops? RepairPal Certified shops can diagnose and repair your 2009 Toyota Highlander. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
2009 Toyota Highlander Resources
https://www.crutchfield.com/ISEO-rgbtcspd/ Phone 1-844-252-1894 .... (1-844-211-7010) Call em up - they got free technical advice - friendly service! ... Eastern time zone.