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      02-15-2019, 10:54 AM   #47
First Lieutenant

Drives: 2012 135i M Sport E88
Join Date: Jan 2016
Location: Carmel, CA

iTrader: (0)

Originally Posted by Stubbie Blue View Post
Backup Camera

I also used a relay so that the camera doesn't draw current from the reverse lights.

However, when the engine is running I get wavy interference in the video. So I ordered a PAC CSS12 noise filter and will see if that helps.
UPDATE: I installed the noise filter but I also improved the ground by connecting the bolt next to the tail light to the main battery grounding point. There's no more interference but I'm not sure if the noise filter or grounding helped more.
Stubbie: BMW is using some sort of AC signal riding on the DC. A simple rectifier was all that was needed. I found one on Amazon for $10 and it solved the problem. You don't need a switching relay. click here