VVDI2 BMW can support to program BMW EWS,BMW CAS1-CASE4+,BMW FEM Key,and xhorsevvdi.com website we sell some BMW keys,here we introduce how to change bmw key battery,take Smart Key Fob for BMW CAS4 CAS4+ System 1 3 5 7 Series Keyless Entry Transmitter 315Mhz as an example.
1.Press the button on back,and take out key blade.
2.Use the key blade insert in another hole,open the back cover.
3.Then remove out old battery.
4.Replace with new battery.
5.Put back the cover,and insert key blade back.
6.Other BMW Key