What to do if the Mercedes head unit does not turn on? (Mercedes Vito / Viano / Sprinter radio power issue / CAN-bus wiring fix)
Symptoms:
After installing a new Android head unit in a Mercedes-Benz vehicle (such as Vito, Viano, or Sprinter), the stereo fails to power on, the screen remains black, and the device receives no ignition signal (ACC) because the factory CAN-bus communication is not properly established.
Solution:
To resolve the power issue and successfully boot up your head unit, check the wiring harness and follow these steps:
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Check CAN-bus Connectors: Inspect the main wiring harness, as it features multiple CAN-bus connectors designed for different vehicle configurations or equipment levels.
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Switch the Connector: Disconnect the current plug and connect the alternative small CAN-bus connector to ensure proper data communication with the vehicle's electrical system.
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Verify ACC Power: Once the correct CAN-bus line is engaged, the decoder will successfully issue the 12V ACC signal required to power on and start the head unit.
For a visual demonstration of this wiring fix, follow the instructions in the video guide: Video Tutorial
Keywords:
Mercedes head unit not turning on, Vito Viano Sprinter radio power fix, CAN-bus connector wiring, Android stereo no power Mercedes, ACC 12V issue, SMARTY Trend installation troubleshooting.