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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 62 ((Heating & Air Conditioning (MTC) - Electrical Diagnostics - 1500, 2500 & 3500)) >> Diagnosis and Testing >> B1015-12-Rear Defrost Switch Request Input Circuit/Performance >> Theory of Operation

Theory of Operation

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC A/C Heater Control contains various switches and knobs that are used to change the systems operation. Many of the switches are momentary switches which are normally open or in the Off position and the status changes when the switch button or knob is pushed or turned. An active Diagnostic Trouble Code (DTC) indicates that the switch is stuck in an On position. A stored DTC indicates that the switch was stuck in a On position for more than 60 seconds but has since returned to its normal state of Off.

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