Heated Windshield - If Equipped

WARNING: This page is about a different car, the 2020 Jaguar XE and 2019 Jaguar XE. However, it is still accessible from the selected car via links, so may be relevant.

The BCM /GWM controls the operation of the heated windshield using a relay in the Engine Junction Box (EJB). When a request is made for heated windshield operation, the ICP broadcasts a message to the BCM /GWM . The message is transmitted on the HS CAN comfort systems bus. On receipt of this message, the BCM /GWM energizes the relay by providing a ground path for the relay coil. This allows a power supply to flow through the relays to power the left and right heater elements.

There are 2 modes of the heated windshield operation. The manual and the automatic modes.

Manual operation is activated by operating the heated windshield switch. When the switch is operated, the status Light Emitting Diode (LED) in the switch illuminates and the windshield heater elements are energized.

Manual operation is discontinued when:

The heated windshield switch is operated a second time.
Between 2 and 5 minutes have elapsed (dependent on ambient air temperature).
The system stops:

If manual operation is discontinued by the engine stopping, the previous heating phase is resumed if the engine is started within 30 seconds.

There are 2 variants of automatic operation. The automatic operation at the start of a trip and the automatic operation during a journey.

Automatic operation at the start of a trip is initiated for between 2 and 5 minutes (dependent on ambient air temperature). If the ambient air temperature is higher, the time will be shorter. In this instance, the switch LED is illuminated and the heater elements are energized.

In addition to shorter operating times there are condition qualifiers to prevent subsequent operations:

The passenger compartment or engine is warm.
There is a significant heat from the sunbeam.

Automatic operation is discontinued if the heated rear window switch is pressed or the system stops. Note: Automatic operation of the heated windshield can be selected ON and OFF on the Settings page of the Climate menu in the IDMA . Automatic operation during a trip is initiated when low ambient air temperatures are experienced and the vehicle is driving for a set period of time above a threshold speed. In this instance, no feedback is given to inform the driver that the heated windshield is operated (the status LED in the switch is not illuminated). The duration of operation is variable depending upon the ambient air temperature, vehicle speed and the duration of time the vehicle is traveling.