The ac stopped working and the control head button doesn't light up. The mode door is defaulting to the floor. The blower works fine. I can put a test light to the relay and the compressor engages. The system is fully charged. According to the schematic (alldata), the control module is in the control head. The VCM is the only other module involved.
I replaced the control head..still inop and I replaced the VCM..still inop.
Any thoughts?