A sensors ability to sense will not turn on the light until 10kph. The only way a sensor can turn the light on without movement is if one is totally open circuit (or at least open enough that the computer discriminator can tell).
Like the other replies I agree the problem is with the voltage supply either through the OVP or from the alternator.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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