Got a mirror off eBay from a gm car, forget which one. When I hook it up lights and onstar work great, but auto dimming does not, which is how it should be. Every post I've read says you need to jump either the 13 and 16 pin, 13 and 14, or 13 and 6. I can't figure out how to jump anything to anything. I am a beginner at this, obviously. Suggestions?