BMW and MINI Cooper CAS (Car Access System) Module Failure and repair
Symptoms of Bad CAS Module
Malfunction message on the iDrive screen
Key not recognized
The car will turn over but not start.
Vehicle Will Not Start - A defective CAS module that has been damaged from water or due to low or overvoltage will prevent the vehicle from starting. Replacing the CAS module and programming is necessary to fix this problem.
Mismatched Key - The code in the CAS module may get out of sync with the code stored in the DME / DDE module.