The vehicle harness connects to the instrument panel by a 13 pin connector. If you reflow solder all the joints of this connector it should fix the problem. I have repaired two panels with exactly the same fault. The pin that usually open circuits is the instrument panel ground. I have some repair photo's that I got somewhere of the web but I didn't take note of the web address and I also have some closeups I took myself I can send you if I knew how. Let me know if you need them.