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 information that the engine is running from the engine control module (ECM) (4/46) on the controller area network (CAN). It receives information about vehicle speed from the brake control module (BCM) (4/16). The central electronic module (CEM) then controls the power steering control module which in turn acts on the solenoid.
The central electronic module (CEM) checks the signals. If a fault is detected, the servo assistance is set to normal (approximately 70 km/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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