Date registered: Dec 2012
Vehicle: 87 560SL, 71 280SL euro, 74 VW Ghia, 78 280Z Black Pearl, 78 280Z, 04 Corolla, 07 Odyssey, 94 Prizm
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Your 211 has a VRLA battery in the trunk. If it has not been replaced, replace it. If it is the original one, it will have a stamp date on the negative battery terminal. The upper numbers refer to the week of production, while the lower numbers represent the year. VRLA batteries require assisted charge, which means you need to have another battery hooked up to it, like a regular sulfuric maintenance battery. Slow charge the battery for 2 days. But, if it is not an original equipment battery, I recommend replacing it with an original equipment battery. Mercedes offers a regular type battery and a VRLA (gel type deep cycle) battery. VRLA batteries are much stronger. Due to SBC taking a lot of energy, that is why you have an assisted battery in the front below your a/c dust filter. If you are mechanically inclined, you can measure the amperage draw with a multimeter. Keep in mind, these vehicles have networking and will require some time before the network "falls asleep" (when the modules stop communicating). You should not have an amp draw greater than 0.07 amps. If you have an amp draw of more than half an amp, there is a module not falling "asleep" and maintaining your network awake. That is why you get the consumer shutoff message in the instrument cluster. The average price for the VRLA battery is 314.00 dollars plus tax. You can ask for a discount at your dealer and maybe they might give you one. When replacing the battery, it is essential to perform certain basic programming like the antipinch of the windows and the sunroof. It is also essential to renormalize the A/C servo motors, but you will require the factory equipment to perform the renormalization of the servomotors. As far as the "Reduced braking power", it can be related to the batteries. If not, there might be a possibility that your SBC pump has already reached its service threshold and will have to be replaced. MB had extended the warranty on the SBC pump for 10 years from the beginning of the warranty start date. Being that your vehicle is a 2003, I highly doubt that it is still under warranty. Check with your local dealer to see if it still has warranty. Cheers!
"The grass is greener...where you water it!"
1994 Geo Prizm (RIP 11/2013)
1970 280SL (sold)
1972 280se 4.5 white w/ red leather
1972 280se 4.5 rust bucket baby blue
1978 Datsun 280Z "Black Pearl"
1978 Datsun 280Z (CLK430 swap)
1971 Datsun 240Z Series 1 final production
1974 VW Karmann Ghia coupe (under restoration)
1972 VW Karmann Ghia coupe autostick
2007 Honda Odyssey
2004 Toyota Corolla