Q: My resr defroster is not working in my 2008 Dodge Caliber

The high level issue is power the rear defroster switch does not stay lit after pressing (it is lit when pressing). The result is the rear defrosted in not getting energized. I turned the car on, had someone hold down the rear defroster button, and I measured the voltage at the fuse (#25) with respect to ground – it is zero. For comparison, the fuse terminals at all other fuses had a voltage of 12-14 Volts. To ensure the dashboard button is not an issue, I removed the dash buttons/cover to expose the circuit board. I can simulate the defroster switch by simply touching the two circuit board terminal points with a piece of wire. Next, to further the analysis, I took power from another circuit and routed it to the fuse 25 socket that connects back to the rear defrost grid – this caused the defroster to operate (it melted snow). So bottom line, the defroster circuit FROM the TIPM is ok when power is applied. The failure point appears to be between dashboard circuit board to TIPM