Durango 2WD V8-5.7L Hybrid (2009)
Control Assembly: Description and Operation
Front - Manual Single Zone With Rear Heat and A/C
MANUAL SINGLE ZONE WITH REAR HEAT AND A/C
The A/C-heater control (1) for the Manual Temperature Control (MTC) single zone front and rear heating-A/C system allows both the front and
intermediate seat passengers the ability to regulate air temperature as well as fan speed and provides floor outlets near the right rear door and overhead
outlets at each intermediate outboard seating position. Primary control for the rear blower motor is on the front A/C-heater control. All controls are
identified by ISO graphic symbols.
FRONT CONTROL PANEL
The front A/C-heater control and integral computer is located in the instrument panel and contains:
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a rotary control knob for rear window washer operation and rear window wiper speed selection (2).
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a slider control knob for temperature control of the discharged air (3).
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a rotary control knob for fan speed selection and turning the heater-A/C system off (4).
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a rotary control knob for rear fan speed selection and turning the rear heater-A/C system off (5).
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a rotary control knob for mode control of the discharged air (6).
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a push button A/C on/off control (7). The Snowflake button contains an LED that illuminates when the A/C system is in operation.
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a push button rear window defogger on/off control (8). The button contains an LED that illuminates when the rear window defogger system is in
operation.
The A/C-heater control for the MTC single zone heating-A/C system is diagnosed using a scan tool See: Powertrain Management/Computers and
Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and Associated Procedures.
Prior to replacing an A/C-heater control, always perform the Actuator Calibration Test to verify the concern is not a heating A/C system issue See:
Testing and Inspection/Component Tests and General Diagnostics/HVAC System Test.
The A/C-heater control cannot be repaired or adjusted and must be replaced if inoperative or damaged. The illumination lamps (9) and control knobs are
available for service replacement.
The A/C-heater control utilizes integrated circuitry and information carried on the Controller Area Network (CAN) B bus to monitor many sensors and
switch inputs throughout the vehicle. In response to those inputs, the internal circuitry and programming of the A/C-heater control allows it to control
electronic functions and features of the MTC heating-A/C system.
The inputs received by the A/C-heater control of the MTC heating-A/C system on the CAN B bus are as follows:
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Ambient Air Temperature
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Dimming
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Engine Coolant Temperature
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Refrigerant Pressure
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Vehicle Identification Number
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Vehicle Odometer
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Vehicle Speed
The messages broadcasted by the A/C-heater control of the MTC heating-A/C system on the CAN B bus are as follows:
