G'day guys, I have recently replaced a rear right window motor in a 2006 Mazda3. The window goes up and down from the rear door switch but will only go down from the master switch, not up. I have used a multimeter at the plug on the motor. When pressed up from the master it shows 12v and when pressed down the polarity reverses to -12v. I am stumped. The power is co.img from the switch but not operating the window. Has anyone come across this problem before?