Thread: ground isolation on VRM and PCM
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Unread 30-01-2015, 16:56
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Re: ground isolation on VRM and PCM
When a VRM/PCM is unpowered or reverse battery'ed it disconnects the ground. Its basic reverse battery protection. When you power a VRM/PCM properly the input and out ground is connected.

This is unlikely your problem. If it was then manually commonizing the Rio and VRM ground would fix it.

Can you oscilloscope the rx pin on the Rio serial port? See if there is actual bytes on the wire. What's the actual symptom? No data bytes or corrupted data bytes?