Humidity Sensor

WARNING: This page is about a different car, the 2006 Land Rover Range Rover Sport. However, it is still accessible from the selected car via links, so may be relevant.

The humidity sensor is a capacitive device integrated into the in-vehicle temperature sensor (see above).

The humidity sensor element is constructed from film capacitors on different substrates. The dielectric is a polymer which absorbs or releases water proportional to the relative humidity of the air being drawn through the sensor, and thus changes the capacitance of the capacitor. For protection, the sensor element is contained in a nylon mesh cover.

The humidity sensor and the in-vehicle temperature sensor are connected to a printed circuit board inside the sensor housing. The printed circuit board is powered by a 5V feed from the automatic temperature control (ATC) module. Separate signals of temperature and relative humidity are transmitted from the printed circuit board to the automatic temperature control (ATC) module.