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:

- a rotary control knob for rear window washer operation and rear window wiper speed selection (2).
- a slider control knob for temperature control of the discharged air (3).
- a rotary control knob for fan speed selection and turning the heater-A/C system off (4).
- a rotary control knob for rear fan speed selection and turning the rear heater-A/C system off (5).
- a rotary control knob for mode control of the discharged air (6).
- 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.
- 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.

The A/C-heater control cannot be repaired or adjusted and must be replaced if found 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:

- Dimming
- Refrigerant Pressure
- Vehicle Identification Number
- Vehicle Odometer
- Engine Coolant Temperature
- Ambient Air Temperature
- 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:

- A/C Request
- A/C Select
- Rear Window Defogger (EBL) Request
- Rear Washer Request
- Rear Wiper Request

REAR CONTROL PANEL





The rear A/C-heater control (1) is located at the rear of the center floor console (2) and allows intermediate seat passengers to adjust rear air distribution, temperature and blower motor speed when the center control knob on the front A/C-heater control (3) is set to the Rear position Description and Operation.