System Operation And Component Description: Notes

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2012 Jaguar XFR, 2012 Jaguar XF, 2011 Jaguar XFR, 2011 Jaguar XF, and 2010 Jaguar XFR. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: A = Hardwired; N = Medium speed controller area network (CAN) bus; O = local interconnect network (LIN) bus; P = Media orientated system transport (MOST) ring.

Courtesy of JAGUAR CARS, INC.

Item Number	Description
1	Battery
2	battery junction box (BJB)
3	central junction box (CJB)
4	Auxiliary coolant pump Comments: all except 3.0L vehicles; 4.2L version shown, 2.7L diesel version similar
5	Touch screen display (TSD)
6	Integrated control panel
7	Information control module
8	automatic temperature control (ATC) module
9	Face/Feet distribution stepper motor
10	right-hand (RH) temperature blend stepper motor
11	left-hand (LH) temperature blend stepper motor
12	Windshield (defrost) distribution stepper motor
13	Blower control module
14	rear junction box (RJB)
15	Blower

Operation of the heating and ventilation system is controlled by the automatic temperature control (ATC) module. See Control Components .

The system can be operated in automatic or manual mode, with temperature settings selected using the switches on the integrated control panel.

When the engine is running, coolant is constantly circulated through the heater core by the engine coolant pump and the auxiliary coolant pump. Where fitted, the auxiliary coolant pump is energized by the central junction box (CJB) on receipt of medium speed controller area network (CAN) bus signals from the automatic temperature control (ATC) module. The central junction box (CJB) broadcasts auxiliary coolant pump status over the medium speed controller area network (CAN) bus for use by other vehicle systems.

The blower is supplied with power by the blower relay on the rear junction box (RJB) and connected to ground via the blower control module. The blower control module regulates the voltage across the blower motor to control blower speed. The voltage set by the blower control module is controlled by a pulse width modulation (PWM) signal from the automatic temperature control (ATC) module. The automatic temperature control (ATC) module uses a feedback signal from the blower control module to monitor blower speed. See Control Components .