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.
Control Module
The most important task of the Forward Sensing Module (FSM) is to manage the functions for:
- Collision warning
- Automatic braking (in the event of an unavoidable collision)
- Brake support (in the event of a collision risk)
- Distance control
- Adaptive cruise control
The control module is located behind a panel by the pedal assembly. The entire control module is removed from the vehicle at replacement.
The Forward Sensing Module (FSM) communicates both with directly connected components and with other control modules via CAN communication.
The control module checks activations and input and output signals using an integrated diagnostic system A diagnostic trouble code is generated if the control module detects a fault. In certain cases the control module replaces the faulty signal with a substitute value.
Any diagnostic trouble codes are stored in the relevant control module memory. The data can be read off using a diagnostic tool.
If the control module detects a malfunction, a diagnostic trouble code is registered inside the control module's internal memory. At the same time, a number of values are stored. These are frozen at the time the malfunction occurred. Depending on the severity of the malfunction, certain functions may be partially or completely disengaged. Diagnostic trouble codes and frozen values (extended diagnostic trouble code information) can be read off using diagnostic tools via the data link connector in the vehicle.
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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.