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.
Body Basic Module (KBM)
The KBM supplies the position of the rear power windows. The signal is fed to the DWA control unit via the K-CAN.
The body basic module also monitors:
- Door contacts in rear doors
- Tailgate contact switch
- Rear window contact switch (E61 only)
The body basic module monitors the boot lid (open or closed). The signal is fed to the DWA control unit in the emergency power siren via the K-CAN.
When the boot-lid lock is mechanically unlocked with the key, the DWA alarm is triggered.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.