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.
Speed sensitive power steering
The central electronic module (CEM) (4/56) receives data from the engine control module (ECM) (4/46) via the control area network (CAN) that the engine is running and information from the ABS system (4/16) about the speed of the car. From model year 2001 the ABS module is called the brake control module (BCM). The central electronic module (CEM) then operates the stepper motor (6/71) via the four outputs to set the stepper motor to the correct servo assistance level.
The central electronic module (CEM) checks the signals. If a fault is detected, the servo assistance is set to normal (≈70km/h) and the system is disengaged. The central electronic module (CEM) also transmits a signal to the driver information module (DIM) (5/1) via the control area network (CAN) which lights the general warning lamp and displays a text message.
Use the Manual With the Right Hardware
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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.
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