1997-1999 Eurovan has no brake wear sensors at any wheel.
2000 Eurovan has a brake wear sensor at the left front and right rear wheel only.
2001-2003 Eurovan has a wear sensor at all four wheels
2000-2005 Rialta, Vista and Sunstar do not use any brake pad wear sensors on the rear wheels.
You can either remove the sensors, or cut the wire off or simply leave them there. No harm will come, as they will not be plugged in.