Manual Temperature Control (MTC)

Each of the A/C heater controls in the Integrated Center Stack (ICS) are resistor type controls. When a button is pushed, or a knob is turned, the ICS sends a resistive signal over hard-wired circuits to the touchscreen in the Radio Receiver Module (RRM). The controls in the touchscreen in the RRM mimic the action selected on the ICS. The touchscreen in the RRM communicates the heater and A/C control request signals to the Heating, Ventilation and Air Conditioning (HVAC) module.

The HVAC module is a dedicated microcontroller for the Dual Zone Manual Temperature Control (MTC) heating and A/C system. The MTC HVAC module obtains evaporator temperature information through hard wired circuits, and occupant heating and A/C settings and other required vehicle information over the Controller Area Network (CAN) data bus. Refer to MODULE, HVAC, OPERATION .

The Dual Zone MTC heating and A/C system is diagnosed using a scan tool. Refer to DIAGNOSTIC CODE INDEX .

Prior to replacing an A/C heater control or HVAC module, check for any Diagnostic Trouble Codes (DTCs) related to the heating and A/C system, and run the calibration procedure to verify that the concern is not an air-door calibration issue. Refer to STANDARD PROCEDURE .

The individual A/C heater controls located in the ICS cannot be adjusted or repaired. If an A/C heater control or control indicator lamp is inoperative or damaged, the entire ICS must be replaced. Refer to MODULE, INTEGRATED CENTER STACK (ICSM), REMOVAL .

The individual A/C heater controls located in the RRM touchscreen cannot be adjusted or repaired. If an A/C heater control or control indicator lamp is inoperative or damaged, the entire RRM must be replaced. Refer to MODULE, RADIO RECEIVER, REMOVAL .