Rear Wiper light on the Dashboard

Have a Nissan Quest GLE 2000.

all of a sudden the "Rear Wiper Light" on the Dash board is on..

Have not used Rear-wiper a lot maybe a couple of times per year...

Surprisingly only a few quests have this light on the dashboard...I checked couple of friend's quest simila r to mine - they do not have this check light on the dash board...

Any ideas ?