Repair manual

21
292_025
Tabs for cri m p
Cable outlet
Arrow for
installation
position
Bracket
Acceleration sender
In order to achieve optimum damping for
every driving condition, knowledge of the
body movement (sprung mass) and axle com-
ponents (unsprung mass) characteristic over
time is required.
The acceleration of the body is measured by
three senders.
Two of these are situated on the front axle
MacPherson strut towers, the third in the rear
right wheel housing. The acceleration of the
axle components (unsprung masses) is deter-
mined by evaluating the signals from the
vehicle level senders.
Body acceleration senders G341, G342, G343
The senders are bolted to the body with
brackets.
The senders and brackets are crimped
together.
The crimp must not be tampered with!
During service work, the sender must
always be replaced together with the
bracket. When installed correctly, the
arrow on the sender housing must point
upwards!
Construction:
The sender element consists of several layers
of silicon and glass. The middle silicon layer
takes the form of a spring-loaded reed (seis-
mic mass). The sensitivity of the sender is
predominantly determined by the spring rate
and the mass of the reed.
Function:
The metal-coated seismic mass acts as a mov-
ing electrode which, together with the upper
and lower counter-electrodes, forms capaci-
tors. The capacitance of these is dependent
upon the electrode surfaces and their dis-
tance from one another.