What Is The Extra Round Plug On The Mercedes-Benz 38-Pin Adapter?

Q: What Is the Extra Round Plug on the Mercedes-Benz 38-Pin Adapter?

It is an optional 12V power connection for the ECU. You do not need to use it if the vehicle has a good battery — the adapter will work through the main connector.

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Applies to: UCAN-II, UCAN-II Pro

The round plug on the Mercedes-Benz 38-pin adapter is an optional 12V power connection for the ECU.

You do not need to connect it if the vehicle has a good battery
It can be used to power the ECU with an external 12V power supply if the vehicle’s battery is dead or disconnected

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