I tried giving you a call to splain it better but before you take it apart you can test the wires at the connector with a light. Ground the light someplace on the frame, then turn the key to run and check the wires coming out of the plug. Red should light, blue should, brown white should and brown should. If brown doesn't, put in park and try, if it does then the switch is buggered and you want to open it up. If brown lights at the plug in run, there is a problem in the wire further down.