There is a TSB on this:
Quote:
Mar 11, 2009
T-B-54.21/198f
Revision: Remedy 3 Added
Model 164.122/172/177/186/822/871/886, 251.122/156/165, Model Year 2008
Battery Discharging - Increased Rest Current in the Rear SAM / CAN Bus Awake
Mode Software in Steering column Module (SCM)
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1973 280SE 4.5 (Sold)
1984 LWB 280GE (Sold)
2000 G500 NMLE - "Deep Throat"
2007 ML320 CDI (Sold)
2010 Porsche Cayenne S Transsyberia TipTronic (Sold)
2010 Audi Q7 3.0 TDI (Sold and Sorely Missed)
2014 ML350 BTC
2015 Audi Q7 3.0 TDI (On Order)
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