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.
Electrical Connection
The head restraint is connected to the safety system control unit by a two-core cable.
Therefore, the head restraint has a catch which prevents it being raised beyond its highest adjustment position and removed from the seat.
The safety system control unit on the E60, E61, E63 and E64 is the ACSM (Advanced Crash and Safety Management).
The control unit for the safety system on the E83 is the MRS (Multiple Restraint System) control unit.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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