HVAC Control Module

Courtesy of JAGUAR LAND ROVER NORTH AMERICA, LLC

The HVAC control module controls the climate control system and the Air Conditioning (A/C) system. The HVAC controls the climate control system from inputs from the Integrated Control Panel (ICP), the Rear Integrated Control Panel (RICP) and the system sensors. In response to these inputs, the HVAC outputs control signals to the A/C system and the heating and ventilation system.

The HVAC also controls the heating for the passenger compartment as required. The HVAC selects the appropriate heat source from the following:

• High Voltage (HV) interior heater.
• Electric drive temperature control system recoverable heat.
• Outside air recoverable beat.

The HVAC communicates with the Powertrain Control Module (PCM) to determine the quantity of heat that can be recovered from the electric drive temperature control system to heat the passenger compartment. The HVAC also determines which alternative source of heat to use to heat the passenger compartment. The HVAC balances the amount of heat from the 3 sources to optimize the distance travelled by the vehicle on the Electric Vehicle (EV) battery.

The HVAC also receives cooling request from the Battery Energy Control Module (BECM) to use the EV battery cooler to provide cooling for the EV battery. The BECM also sends requests for heating for the EV battery when the vehicle is connected to an external power supply to charge the EV battery.

The PCM provides the HVAC with the Ambient Air Temperature (ATT) data from the ATT sensor in the left door mirror through the High Speed (HS) Controller Area Network (CAN) power mode zero systems bus.

The HVAC has 4 main wiring harness connectors. The 4 connectors have the following connections:

• Power supply.
• HS CAN power mode zero systems bus (quantity 2).
  • PCM
  • BECM
  • Body Control Module/Gateway Module (BCM/GWM).
  • HS CAN Human Machine Interface (HMI) systems bus (quantity 2).
  • RICP
  • BCM/GWM.
  • Local Interconnect Networks (LINs) (6 off) for the following:
  • Climate control assembly, air distribution motors and temperature blend motors.
  • Recirculation motor.
  • Humidity sensor.
  • HV interior heater.
  • Electric A/C compressor.
  • A/C isolation valve (quantity 5).
  • Electric drive cooler.
  • Heated Windshield (if equipped)
  • Front row seat heated (quantity 2) (if equipped).
  • Second row seat heated (quantity 2) (if equipped).
  • Private CAN bus for the ICP (quantity 2).
  • Hardwired components:
  • Blower, Pulse Width Modulation (PWM) signal.
  • Duct air temperature sensor (quantity 4 for 2 zone and quantity 8 for 4 zone).
  • Sunload sensor.
  • A/C temperature pressure sensor (quantity 4).
  • Front A/C isolation valve.
  • EV battery cooler.
  • Climate control coolant pump, PWM signal.
  • Climate control changeover valve.
  • Pollution sensor (if equippped).
  • Air ionizer (if equipped).
  • Ground connections.
    NOTE: Not all connection pins in the 4 main wiring harness connectors are used.

    The HVAC in addition to controlling the A/C system and the heating and ventilation system, also controls the following:

  • The windshield washer jet heaters and the wiper blade heater.
  • For additional information, Refer to: WIPERS AND WASHERS .
  • The temperature control for the front and rear seats.
  • For additional information, Refer to: SEATS .