Chrysler Repair: Heater/AC vent contols stuck in one position, mode selector switch, amp fuse

Question
My son recently had a new battery installed in his 95 Chrysler Cirrus. Now the air vents blow air to the floor but do not respond to changes in the selector settings. Any connection?
What could be the problem and what is the fix?

Thanks

Answer
Hi Dean,
I have a '96 shop manual for the Cirrus which I hope applies to the '95 of your son. The door that controls the air distribution is shown to be electrically operated so I supppose it is possible that a fuse blew for some reason when the battery was changed. The door motor gets its 5 volt power from the body control module and that module has 4 fuses that are involved in supplying it the power for its function (including the 5v for the distribution door). The fuses are located in cavity 5 of the fuse box (junction block) in the cabin on the drivers side, under the dash I believe, a 20 amp fuse in cavity 8 of the power distribution center (black box under the hood on the drivers side near the front), a 10 amp fues in cavity 11 of the fuse box in the cabin, and a 15 amp fuse in cavity 9 of the fuse box in the cabin. So a place to start would be to check those fuses looking carefully to make sure they aren't just cracked rather than totally blown out which sometimes can make you believe the fuse if o.k. The other possibilities are that the motor for the door is not working and needs to be replaced, but I would check to make sure it was getting the 5V from the body module before I did that, or that a resistor in the door mode selector switch in the control panel is burned out which has defeated the ability of the body control to recognize the various switch positions. It would probably be better to send you the wiring diagrams before you or your son get into that sort of electrical trouble shooting because it is too complicated to give it to you as a text message. So let me know how much more you need to know and whether you have a volt-ohmmeter and the interest in doing this troubleshooting. I hope it is just a fuse! The door motor look very accessible as is its plug so you could check the 5V supply and also if the seitch is o.k. it looks easy to replace the motor.
Roland