A battery that has been sitting all night will still show 12.x in the morning..12.25 to 12.5 at 75 degrees F is a good indicator in most circumstances. Measure at the battery terminals..I have found discrepancies from the OBD due to voltage drop I think. You can take another reading with the car on..Voltage would be around 13.5, 13.75 V, or Turn on the ignition; don’t start the engine. Turn on the scanner and select your BMW chassis. Next, Select the Control Units menu. Select the TCU Module. Once you enter the TCU module, you can do the following. Verify that it supports your BMW model and year when purchasing a BMW scanner [2]. iTrader: ( 2) Think this way. A car lead-acid battery is made up of six 2volt cells in series making 12 volts (all wet lead acid cells are 2 volts) So it will be 12v, or just above, when not charging (6x2v = 12). Lead acid cells need to be pushed above 2.25V to charge, so 6 x 2.25 = 13.5V. BMW produced three series in the name of F30 and F31 which was started from October 28. After 2011 it was collectively known as F30. The F30 model was a great success that provided optimal fun with a sports chassis. It is among those vehicles which provide optimal reliability with performance and a smooth driving experience. Hallo, i bought a 320d thats not starting. Car cranks, but not starting no commuication with dde with ista. i have checked , cables from battery, tried jumping dde relay, checked all fuses , had out all fusebox and checked it up. fuel pump goes but never stops when ignition is on if someone can help me i would be grateful best regards from norway. BMW Serie 3 F30 F31. How do you remove the battery? BMW Serie 3 F30 F31 more. How do you remove the battery? BMW Serie 3 F30 F31. We reimagined cable. IHqFUYB.