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My cousin bought a 2017 Ridgeline and took it to Alaska. After the summer was over he left but forgot to disconnect the battery. Needless to say he needed a jump when they got back. Now the truck runs and drives with no noticeable issue as far as it getting down the road but at least five (probably more) different warnings continuously flash across the speedometer area. The speedometer and most of the other functions on the dashboard do not function. The heat a/c work, the windows roll up and down, the seat heaters work, it shifts and drives and starts and stops. The backup camera works. The radio does not work. We tried taking it to multiple dealers and their systems do not even show that a car has been attached, the car doesn't seem to change function and they stand and look at it while they scratch their head. We've been told to replace the computer and maybe that will work ($700 plus labor). We have also been quoted $3000 to "take the dash apart and see what we might be able to find."

We thought we were out of the problem when a dealer offered to buy it but they changed their mind even though we have a signed offer.

So, first, what should we do to try to find the issue? What does the diagnostic computer's inability to communicate with the car suggest?

Second, do we have any recourse to get the dealer to take the car and pay the price offered on the written offer? It was a Honda dealership in the state of Washington if that makes any difference.
 

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Put a new battery in it or swap it temporarily with a known good one. The battery must be in good working condition. Not 1/2 charged not kinda good. Must be good.
 

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Start checking every inch of wiring for rodent damage more than likely that's your issue, About ten to fifteen years ago the brilliant engineers along with the devoted tree huggers decided to make the wire insulation out of soy aka food.

Good luck
 

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Start checking every inch of wiring for rodent damage more than likely that's your issue, About ten to fifteen years ago the brilliant engineers along with the devoted tree huggers decided to make the wire insulation out of soy aka food.

Good luck
I thought that was an Urban Myth that was debunked a while back....
 

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Start checking every inch of wiring for rodent damage more than likely that's your issue, About ten to fifteen years ago the brilliant engineers along with the devoted tree huggers decided to make the wire insulation out of soy aka food.
I thought that was an Urban Myth that was debunked a while back....
See this post which includes a quote from Honda.
 

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See this post which includes a quote from Honda.

That reply from Honda on the other thread stinks of PR speak and or CYA, Ford and Toyota do use soy based due to lower cost and environmental reasons and generally when one manufacturer finds a way to do things cheaper the others follow suit. Regardless rodents and wires tend to be a somewhat common occurrence esp on vehicles that sit unused.

The Drive on Soy based insulation

MoterBiscuit Class action lawsuit Toyota soy based insulation
 
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