Mercedes Benz E220 CDI, 2007, W211 - Plinger

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Discontinuation of two-battery on-board electrical system

Model 211/219 As of code 807 Model year 2007

As of the model year, the two-battery on-board electrical system (i.e. the additional battery in the engine compartment (right front), the battery control unit the additional battery relay) is to be discontinued.

The battery sensor is new, this is located at the negative terminal of the battery. The voltage, current and temperature of the battery is measured and evaluated, from this the condition of the battery can be derived. This information is processed by the rear SAM control unit. The quiescent current is likewise monitored via the battery sensor. At a current value >75 mA, the information is stored in the rear SAM control unit and can be read out using the STAR Diagnosis (access via "on-board electrical system"). Information on consumer shutoffs is no longer displayed on the instrument cluster. In the case of battery discharge caused by switched-on consumers, this information can be read out via STAR Diagnosis.