2003 matrix window down need fix

You need to disconnect the harness that clips in at the window motor first.  You cannot just tap into the wires, the rest at ground.  If you try to apply voltage to the wires you will be creating a short. So,  after you disconnect the harness, there should be only 2 contacts at the motor.  apply 12v to one contact and ground to the other.  if the window doesn't go up then reverse your 12V and Ground.  One way makes the window go up, the other makes the window go down.  If you try it both ways and the window doesn't move and you are definitely giving it power, then your window motor is shot.

Also, if you cannot get to the power window connection at the motor, you can cut the two wires in halve.  You'll use the motor side of the wires you cut. At the end just put the wires back together.

Good luck,

Frank