Blower Control

WARNING: This page is about a different car, the 2021 Jaguar I-Pace, 2020 Jaguar I-Pace, and 2019 Jaguar I-Pace. However, it is still accessible from the selected car via links, so may be relevant.

The HVAC control module monitors a feedback voltage from the blower control module. In response to the feedback voltage, the HVAC provides a Pulse Width Modulation (PWM) signal to the blower control module which is used to regulate the current flow across the blower motor and hence regulate blower speed. The blower control module is provided with a power supply from the blower relay in the left Engine Junction Box (EJB).

When the blower is in automatic mode, the HVAC determines the blower speed required from comfort algorithms. When the blower is in the manual mode, the HVAC operates the blower at the speed selected on the Integrated Control Panel (ICP).

The HVAC also controls blower speed to compensate for the ram effect on intake air produced by forward movement of the vehicle. As vehicle speed, and consequently the ram effect increases, blower speed is reduced.