Navigational (global Positioning System) Gps problems of the 2004 Toyota Highlander

The contact owns a 2004 Toyota Highlander. The contact stated that the gps navigation system on the vehicle failed which caused the air conditioning, heat, defrost and the radio to fail. The contact had the vehicle inspected by the dealer and was told that the navigation system needed to be replaced; however, the dealer did not give an explanation of what caused the failure to occur. The failure mileage was 42,000 and the current mileage was 82,000.

The gps in my 2004 Toyota Highlander goes on and off without warning. When it does it disables the defroster, ac and heat. I don't care about the gps, but when it disables my defroster, it is a safety issue. It should have been a recall from the manufacturer. Toyota has informed me a new gps will cost $5,000. 00. I can put a used one in for $1,500. 00. This is an unfair price to have a necessary safety function, the defroster, to work. Defroster are required for state inspection. Do you have any suggestions for Toyota to address this issue?.