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.
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HOMESERVICE MANUALSBMW2001330CI CONVERTIBLE (E46) L6-3.0L (M54)REPAIR AND DIAGNOSISCRUISE CONTROLDESCRIPTION AND OPERATIONOPERATIONBRAKE LIGHT SWITCH
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)
Brake Light Switch
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)SECTION Brake Light Switch
Brake Light Switch
The electronic brake light switch only operates as from terminal R ON.
It has its own voltage supply.
If the brake light switch is OK, it assumes a high-resistance setting when the ignition is switched off, i.e. it sends a signal as if it were operated. If this is not the case, this indicates a short to ground and the messages "brake light defective" as well as "rear right lamp defective" and "rear left lamp defective" are output or indicated in the pictogram in the instrument cluster.
The light switching center recognizes the "operated" status if there is a break in the line. If is recognizes the switch interrupted for longer than 10 s as operated, the light switching center then also makes use of the vehicle acceleration signal. If a conflict is then detected, the above-specified error messages are output.
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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.