This one took me a bit to sort through, according to the fault codes index 00852 is: - Loudspeaker(s) Front: Open Circuit.
But here's the catch, it's a false indication for my set-up. I installed RNS-E navigation and did not change the long coding to suit in 19-CAN Gateway for navigation present. The nav worked fine except I was getting a mis-leading fault code. Once i changed the long coding, I was good.
From => 3F3F0360074102
To => 3F3F0368074102
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2006 A3 :: 2.0T :: DSG :: RNS-E :: BT :: Sirius Sat :: Silver/w Black Leather :: O.Z. Ultraleggera 18x8 :: APR Stage II