There is no part of the system that makes the light come on. The light is turned OFF by the ABS. If you remove the ABS controller the light will stay on.

As mentioned above you should start with the bulb/bulb circuit. Then see if the light goes out when the engine starts. Removing the bulb will cause the system to deactivate.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician