Good evening ladies and gentlemen I have a problem with my 2006 H3. The battery died the other morning and I charged it cleaned all the terminals and put it all back together. The truck starts fine and runs fine. The HVAC lights do not light such as AC recirculation and rear defrost. The stereo also does not have power. I checked all the fuses I could think of according to the diagram, but had no success. I reset the computer by leaving the terminals off for an additional hour and put them on positive first then negative the problem still exist. I am open to any advice at this point as I said everything runs and drives fine. The fan control works. The dash position works as well. I don’t know how to check the recycle switch and my AC has never worked again. If I push the rear defrost, I get no light please help thank you.

 

Welcome to HF.

Are you still trying to use the Crappy Azzed OEM Battery Terminal Connectors? If so, hack them off and replace with a quality aftermarket set like Stinger or your favorite brand. Number 1 known cause for many, many electrical Gremlins, plenty of posts on the topic here to review if you like.

Get a can of CRC Electronics Cleaner, these trucks are old and every owner should have that stuff on hand.

What is Battery voltage at rest?
Do you have a sun roof? If so has the passenger side floor ever been wet? If so, you need to do the sun roof drain fix and will need to check the BCM behind the passenger kick panel for corrosion at the connector and harness.
You should check grounds for good clean contacts, start with the one behind the battery on top of the fender well driver side, then the other on the fender passenger side. Look at the fuse block for corrosion as well.

Disconnecting Battery Terminals does not "reset the computer" as H3s store the last 300 ignition cycles power or no power, it simply reboots.

 

Check the HVAC RELAY #87 and the radio fuse, including pulling the items and cleaning any terminal corrosion. These two items are electrically connected in the fuse box so could have a related single fault. Have you had any recent fuse box work?

 

Actually, Just check the RDO fuse# 13 and make sure its now blown. It turns out that fuse provides power to BOTH the radio head AND the HVAC control logic circuit. If you replace the fuse and it blows again then you have a short to ground somewhere on that wiring.
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Thank you for all the helpful input. Turns out when I checked the fuses I checked them visually by pulling Norman looking which I should know is not the most reliable way to check. I decided to check the fuses again electrically I went on each side with the car in run and checked voltage on each side of every fuse found out the fuse 13 which was pointed out earlier was the one that was blown replaced it and my HVAC came back found out that my radio is shorted out internally. It isn’t aftermarket radio will be replacing it within the next day or two again thank you for all the helpful replies.