I have no operable controls on the ac/heat system. It blows only hot air. Controls stopped working after installing after market stereo with chime interface and steering wheel interface. Blower control works but, temp and position dials are unresponsive. Illumination doesn't work on same dials and ac indicator and defrost indicators don't respond. All other switches, dials and illuminations work. I'm in the process of checking all related fuses and relays. I can't help but think if those check out it would have to be the control module that died considering everything else works. Any help is greatly appreciated. I'm new to the site and have been replacing parts on this car since the week the warranty expired so I will be happy to share my experiences in return. Thanks