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Probably a good idea, however that generation of Motronic is quite tolerant on battery voltage. +12V line is apparently sampled by the ADC, and probably monitored by the MCU. And the 5V line seems to be supported by a low dropout +5V regulator that can still function with voltages as low as 6V.
Josh, have you checked and listen to the ICV in the engine compartment for humming when ignition is on and engine is off? Any humming / buzzing is a good sign that the MCU has a heartbeat. Sorry if you have already mentioned it.
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Gilles
RoW 88 Carrera coupé
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