Rats. The original radio would have cut the diagnostic time in half. Instead of a simple dash light rheostat, they use pulse-width dimming, which means a computer module is involved. I'm going to have to dig for a service manual to see exactly how the system is wired. In the meantime, if you can find a rheostat in a salvage yard, substituting it would be the quickest way to determine if the old one is defective.
These have an extremely low failure rate on Chrysler products. One thing though that can take them out is the wire to the radio. If that is not sealed well and it touches the metal case of the radio, that could damage it. The most common thing I've run into when aftermarket radios are involved is when the installer hacked off the original plugs, then covered the bare ends with electrical tape. Tape will unravel into a gooey mess on a hot day.
Thursday, August 28th, 2014 AT 11:25 PM