The rear acceleration sensor records the acceleration of the vehicle body at the rear in vertical direction.
The body acceleration is caused by the reaction of the vehicle to the road surface.In addition to the absolute acceleration, the acceleration frequency is also recorded, i.e. the changes in acceleration (spring deflection/rebound), in other terms the vibration frequency of the vehicle body.
The acceleration sensor receives a 12 Volt supply from the control unit.
A voltage value between 0 and 5 Volt is output to the control unit at the signal output of the sensor. A value of 2.5 Volt represents the rest position (acceleration = 0), the value 0 Volt and 5 Volt are the maximum acceleration values.
Important!
In order to check the function of the sensor, "front acceleration sensor" can be selected in the diagnosis program under the point "Function test".
Checking outside the vehicle:
Remove sensor, connect to 12 Volt supply and negative and check function by measuring voltage at signal output while at the same time moving the sensor.If the sensor is operating correctly, the measured voltage value will vary between approx. 0 and 5 Volt (depending on movement, i.e. acceleration magnitude).
Installation location of sensor:Rear RH spring dome, accessible from luggage compartment after removing the trim.