If you are trying to use it while on defrost, that is normal. It is telling you you can't do that. If not then, you have a door malfunction.
check the increase/decrease interior light button, if it is close to being in the complete on position this can happen. Keep in middle setting
It requires a scan tool capable of performing software flashes.
Low fluid, Trans computer that needs a software flash at the dealer, failing trans, etc
Here in Central New York, as of Nov 2012 rthe cost is around $100 just to flash the unit
exhaust recirculation system
You have a short circuit in your wiring. You need to take your vehicle to a mechanic to have it fixed before you damage your battery.
A lot of these vans had software upgrades for trans shifting issues. The dealer can "flash" new software into the computer.
Click on common, then click on the shapes then click on flash button.
Turn Key on, do not start engine. Cycle key on and off 5 times (without starting engine) Check engine light will flash in a series. Example: flash, flash, short pause, flash= 21. If there are more than one code there will be a longer pause then the next code. Luke J. Wisconsin
Turn the key on then off and on again then off again then on once more and watch the check engine light count how many times it flashes. it will flash 1 for 1 or 2 for 2 or it will flash 2 then pause then flash 5 more time for 25 or so on.
Flash button
Hold time button until hour flashes, use audio button to adjust hour,push in audio buttonand minute will flash use audio button to adjust minutes then when time is set push in on audio button again and time is set.