Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Acceleration sensor, suspension
On the front suspension are two acceleration sensors, one on each spring strut. These measure the speed of vertical change. The sensors are supplied with 5 V by the suspension module (SUM). When the vehicle is stationary, the output signal from the sensors is approximately 2.5 V. When there is vertical movement the signal will oscillate around this value; the greater the movement the greater the deviation. The control module calculates a damper position and speed from the acceleration. The control module uses the position and speed to determine the required damping force.
There are diagnostics for the acceleration sensors.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.