Description And Operation: Operation

WARNING: This page is about a different car, the 2022 Chrysler Voyager and 2022 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.

All climate control communications take place on the Controller Area Network - Interior High Speed (CAN-IHS) bus. HVAC control logic takes place in the HVAC module. All front and rear HVAC control logic is contained in the front HVAC module.

The purpose of the rear HVACR module is to follow CAN-IHS commands from the front HVAC module and position the rear HVAC doors and control the rear blower speed only.

It also reads the rear HVAC air outlet temperature sensor and sends that value to the front HVAC module over CAN-IHS.

Front HVAC Module

The front HVAC module is responsible for controlling the following MTC/ATC Systems:

Air distribution modes (actuators)
Blower motor speed
Air recirculation/vent modes

The front HVAC module receives input from the following sensors:

Evaporator temperature sensor
Sun load sensor
Cabin temperature sensor
Humidity sensor

If equipped with Tri-Zone ATC:

Left floor temperature sensor
Right floor temperature sensor
Left panel temperature sensor
Right panel temperature sensor

Rear HVAC Module

The HVACR module is responsible for controlling the following MTC/ATC Systems:

Air distribution mode (actuator)
Blower motor speed
Air recirculation/vent modes

The HVACR module receives input from the following sensors (if equipped with Tri-Zone):

Rear floor temperature sensor
Rear panel temperature sensor