A/C Heater Control - Automatic Temperature Control (ATC)
| Refer to COMPONENT INDEX . |
Each of the A/C heater controls in the ICS module are resistor type controls. When a button is pushed or a knob is turned, the ICS module converts a resistive signal to a data message that is then sent to the Uconnect® touchscreen module via the CAN. The controls in the Uconnect® touchscreen module mimic the action selected on the ICS module if the Uconnect® touchscreen module input method is used by the customer. The Uconnect® touchscreen module will then communicate the A/C heater control request signals to the HVAC module.
The HVAC module is a dedicated microprocessor that automatically drives the electrically operated air-door actuators for the Dual Zone ATC HVAC system. The ATC HVAC module obtains sun load, in-car temperature and evaporator temperature information through hardwired circuits. Occupant HVAC settings and other required vehicle information are obtained over the CAN-IHS data bus.
Inputs
- Temperature unit setup from IPC
- A/C button switch
- Auto button switch
- Rear defrost button switch
- Front defrost button switch
- Power OFF button switch
- Recirculation button switch
- Blower speed knob switch
- Driver temperature UP button switch
- Driver temperature DOWN button switch
- Passenger temperature UP button switch
- Passenger temperature DOWN button switch
- Blower speed selection button switch
- Operational mode status
- Ignition status
- Climate system status from HVAC module
Outputs
- Customer button and knob selections to HVAC module
- Customer button and knob selections to radio
- A/C button light ON/OFF command
- Auto button light ON/OFF command
- Recirculation button light ON/OFF command
- Rear defrost button light ON/OFF command
- Front defrost button light ON/OFF command
The Dual Zone ATC HVAC system is diagnosed using a scan tool. Refer to: HEATING AND AIR CONDITIONING - DIAGNOSTIC CODE INDEX .
Prior to replacing an A/C heater control or HVAC module, check for any Diagnostic Trouble Codes (DTCs) related to the HVAC system, and run the calibration procedure to verify that the concern is not an air-door calibration issue, Refer to: HVAC VERIFICATION TEST .
The individual A/C heater controls located in the ICS module cannot be adjusted or repaired. If an individual A/C heater control or control indicator lamp is inoperative or damaged, the entire ICS module must be replaced, Refer to MODULE, INTEGRATED CENTER STACK (ICSM), REMOVAL AND INSTALLATION .
The individual A/C heater controls located in the Uconnect® touchscreen module cannot be adjusted or repaired. If an individual A/C heater control or control indicator lamp is inoperative or damaged, the entire Uconnect® touchscreen module must be replaced. Refer to RADIO, REMOVAL AND INSTALLATION .