Suspension Height Sensors
There are 4 suspension height sensors used in the Adaptive Damping (AD) system, 2 for the front suspension and 2 for the rear suspension. A front suspension height sensor is attached to a bracket on each side of the front subframe and connected by a sensor arm and sensor link to the related lower arm of the front suspension. A rear suspension height sensor is attached to a bracket on each side of the rear subframe. The height sensors are connected by a sensor arm and sensor link to the related rear transverse link of the rear suspension.
On each suspension height sensor, the sensor arm and sensor link convert linear movement of the suspension into rotary movement of the sensor shaft. The suspension height sensors measure suspension displacement at each corner of the vehicle and output a corresponding analogue signal to the Chassis Control Module (CHCM). The algorithms in the CHCM calculate the position, velocity and frequency content of the signals and use the results for wheel control.
Each suspension height sensor is connected to the CHCM via 3 wires, which supply ground, 5V supply and signal return.
The sensing element consists of Hall effect devices arranged to measure the direction of the magnetic field of a small magnet attached to the end of the sensor shaft. As the sensor shaft rotates, so do the lines of magnetic flux from the magnet. The signals from the Hall effect devices are processed by means of a dedicated integrated circuit to generate an output voltage that varies as the sensor shaft is rotated. The sensor has a measurement range of ± 40° around its nominal position and the nominal sensitivity is 57 mV/° of shaft rotation.
If a height sensor is replaced the height sensor offsets will need to be updated using the Jaguar approved diagnostic equipment.