I have a 2009 Dodge Ram 1500 what would cause the automatic lights, AC/Heater temp control, and Air direction modes switch, to all not work? The ac/heater fan still works and regular lights still work fine. Lastly, what started it is that my AC stopped blowing cold air and when I tried to recharge the system, all the things I've said that don't work being working again until the ac quits again then they all go out again. Anybody have any answer?

Asked by Jan 05, 2016 at 06:54 PM about the 2009 Dodge Ram 1500 SLT Quad Cab

Question type: Maintenance & Repair

1 Answer

30

I have the same issue in my 2009 ram 1500. it is the heater control unit. the sun sensor on the dash sends a signal to the heater control unit and that sends information out via can-bus to control certain features including the auto headlights and AC functions you lost

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