2003 Grand Caravan AWD - AWD not working.

My 03 Grand Caravan AWD has a problem with the AWD. The rear wheels never kick in -this worked fine last winter - I just noticed the problem because of the show we just got - the problem may have been
around for quite a while without my noticing it. It essentially acts like a front wheel drive van now - terrible in the snow. Any advice would be appreciated. It still has the 7/70K powertrain warranty in effect - Hopefully it would be covered if I have to bring it in.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.