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.
Power Windows: Introduction
The power windows for raising and lowering the side windows are designed as a cable lift drive.
Up to 09/2005, the power windows for the front doors are actuated by the door modules (driver's door module TMFA and front-passenger door module TMBF). The power windows in the rear doors are actuated by the body basic module (KBM).
- From 09/2005
The door modules are discontinued. The power windows on the front doors are actuated by the body gateway module (KGM).
The E63 has no power windows at the rear.
On the E64 the rear power windows have no anti-trap circuit. The rear power windows can also not be operated from the rear seat area.
The Car Access System (CAS) controls the enabling and locking of the power window actuation depending on:
- Terminal status
- Status of door contacts
- Country-specific encoding
In addition, the convenience operation of the power windows (convenience opening/closing) is controlled by the CAS control unit.
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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.