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i have a 05 w211 e55 amg SBC was damaged due to accident, just replaced it with another used one. while trying to bleed the brakes with DAS i get an Note " Voltage at control unit SBC:0.2V" . what does that mean ? im i connecting the battery charger at the wrong place ? i connected the charger in the trunk, positive on the battery and negative to the body of the car.
 

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07' slk 55
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the sbc battery is located r/f firewall area under the dust filter box. theres a switch/relay to shut it off, as well as fuses in the prefuse box located under the passenger front seat floor board that may be blown/broken from the accident. Id be very cautious about using another sbc off a different vehicle. It has a intergrated control module that needs to be coded to the vehicle.
 
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