Hello Everyone, I have a 2010 Nissan Maxima Sv with 100K miles. The fan is on high and blowing hot air. This happened after replacing the battery. There is lights on the dashboard, navigation screen is off, radio, speakers are off, none of the buttons work on the dashboard. Fan is blowing hot air and its stuck on full speed wont turn off. I have checked all of the fuses under the hood and under the steering but they all seem to be fine. I'm new to the forum any help would be very appreciated.

 

Very unusual symptoms. If it were just the blower, I would expect a bad blower resistor pack, but with your description of the Nav/stereo/button issue, it almost sounds like you fried the BCM somehow (assuming all fuses are indeed good...you may want to double check with a VOM or at least that is where I would start as it is the easiest and cheapest thing to do.)

Is it possible whomever changed out the battery reversed the polarity initially?

 

I'm having the same problem with my 2012 Nissan Maxima SV. I cannot determine so far where the issue is I believe it's the HVAC module.