Rear Cabin Comfort Controls Module
DESCRIPTION
The Tri-Zone and Quad-Zone Heating, Ventilation and Air Conditioning (HVAC) systems allow the driver, front seat passenger and the intermediate seat passengers, the ability to individually regulate the air temperature for their portion of the vehicle. All controls are identified by International Standards Organization (ISO) graphic symbols.
The rear HVAC system provides the intermediate and rear seat occupants with a number of options to help control climate and comfort within their area of the vehicle (Refer to the Owner's Manual for more information on the features and settings of the HVAC system).
On vehicles equipped with the Tri-Zone and Quad-Zone HVAC systems, the primary controls for the rear HVAC system are in the Rear Cabin Comfort Controls (RCCC) (1), located in the rear of the floor console.
The rear controls allow intermediate seat passengers the ability to adjust rear air distribution, temperature and blower motor speed. Air distribution is controlled by actuators in the floor console and rear floor ducts. The floor console actuators are located at the rear of the floor console duct, near the floor console duct to outlet duct joint. The third row actuators are located just behind the third row floor duct outlets, below the center of the seats.
OPERATION
Each of the controls in the RCCC are resistor type controls. When a button is pushed, the RCCC sends a resistive signal that is converted to a Controller Area Network - Interior High Speed (CAN-IHS) bus message to the HVAC module, which then sends Local Interface Network (LIN) bus messages to the actuators that are to be adjusted. The LIN bus circuit is attached to the actuators in series, starting with the defroster actuator and ending with the second row B-pillar actuator. For additional information on the HVAC system actuators. Refer to DESCRIPTION AND OPERATION, CONTROLS FRONT or DESCRIPTION AND OPERATION, CONTROLS REAR .
Power for the RCCC is provided by a fuse in the Power Distribution Center (PDC) and ground is continuous using a ground stud located at the front of the floor console.
The Tri-Zone and Quad-Zone HVAC systems are diagnosed using a scan tool. Refer to DIAGNOSTIC CODE INDEX .
Prior to replacing a rear RCCC or rear 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 RCCC located in the rear of the floor console cannot be adjusted or repaired. If a rear RCCC or indicator lamp is inoperative or damaged, the entire rear RCCC must be replaced. Refer to CONTROLS, REAR CABIN COMFORT (RCCC), REMOVAL AND INSTALLATION .