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 DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONTRANSMISSION MANAGEMENT SMG (SMG SEQUENTIAL MANUAL TRANSMISSION)BRAKE LIGHT SWITCH (FUNCTIONAL DESCRIPTIONS)
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)
Brake Light Switch (Functional Descriptions)
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)SECTION Brake Light Switch (Functional Descriptions)
Stop-Light Switch
The signal of the stop-light switch is an analog signal to the SMG control module. For the purposes of redundancy, the signal of the stop-light switch is transferred from the engine control module via the vehicle CAN bus.
The signal of the stop-light switch is used for:
- unlocking the shift lock
- brake detection
- disengaging a gear with the engine at a standstill.
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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.