It is not likely to be the ECU. Bosch will test certain ECUs, I would find out from your local BSC (Bosch Service Center).
I have not worked on any ABS on "G" cars but they should have onboard diagnostics. that should be tested first before worrying about the controller.
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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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