I turned on the car to check the operation before I reconnected the airbag module. Reassembled everything and now Airbag dash light is on. Code read bad connection driver door. Could not clear code. Replaced entire airbag module and installed new connector, light still on, same code. Tried hard reset, battery disconnect, same problem. Help!
The first thing to know is that most BMW key fobs use CR2032 batteries. These batteries can be found at most electronics stores or online. When replacing the battery, it’s important to use one with the same voltage and capacity as the original battery. Using Different Types of Battery. Using a different type of battery could damage your key fob. The vehicle is coded with information related to the size of the battery as well as type of battery. Most stock M3s will have a 90ah AGM battery. Recoding is suggested when changing battery size. That said, as long as the battery purchased was an AGM battery, in this case only a reset of the IBS adaptation values would be required. What size battery does a BMW E90 use? Most US Market E90 use the 90/720 AH/CCA battery. If you have CIC or the business radio with Bluetooth, you car uses the 90/720 battery. It also will have the battery monitor terminal on the negative cable. The “810” part number is the current 90/720 BMW battery.
After a lot of forum reads and hundreds of brake light resets from the cockpit MMI, I decided to make a little write up of how to EASILY turn the rear brake
2011 BMW 328xi [0.00] E90 Changing a battery = FRM Failure! Well lesson learned! Decided after getting inspection, new tires, and 130K mile fluid flush that I should proactively replace the battery as it is more than 4+ years, and hey Walmart will install for free! While waiting in the store "browsing" because you can't have a waiting room in a
BMW E90 TRACTION LIGHT ON, DSC, BRAKE LIGHT ON after Battery Replacement e91, e90, e92, e93 316i 318i 320i 323i 325i 328i 330i 335i 316d 318d 320d 325d 330d
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    • bmw e90 battery replacement reset