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 MANAGEMENTDESCRIPTION AND OPERATIONENGINE MANAGEMENT MS43 (DME MOTOR ELECTRONICS MS43)PEDALS (FUNCTIONAL DESCRIPTIONS)BRAKE LIGHT SWITCH SIGNAL
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)
Brake Light Switch Signal
2001 BMW 330Ci Convertible (E46) L6-3.0L (M54)SECTION Brake Light Switch Signal
Brake-Light/Brake-Test Switches
Two switches are fitted on the brake pedal which supply the following signals:
- S_BLS (Brake-Light Switch)
- S_BLTS (Brake-Light Test Switch)
The DME control module evaluates the signals for the purpose of registering brake operation.
Function
- Model series E38, E39, E46, E53, E6x, E8x:
The brake-light switch connects to ground (B-), the brake-light test switch connects to B+.
- Model series E36/7 (Z3):
The brake-light switch and the brake-light test switch connect to B+.
Both signals are checked for plausibility.
The following tables show (depending on the model series) how the status of the brake-light switch/brake-light test switch performs:
Troubleshooting
If the signals are not plausible in relation to one another, a fault code is stored in the DME control module. Cruise control is deactivated as a result of this fault memory entry.
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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.