FRM & CAS/FEM Module Repair In Teesside


FRM3 Footwell Module Repair


A very common problem with BMW FRM3 footwell modules.


This failure usually occurs if the vehicle has had battery issues, been jump started, disconnection of the battery, issues after running diagnostic / programming procedures. In 99% of cases the FRM3 footwell module can be brought back to life without need of replacement module.


Symptoms of failure include:

  • Main beam always on with ignition & cannot be switched off.
  • No interior lights
  • No indicators
  • Bulb check error on dash.
  • Electric windows, sunroof, mirrors, central locking not working.
  • FRM module not responding with diagnostic tool.


BMW charge over £400 to repair this fault.  We can do this for a fraction of that.

CAS & FEM Immobiliser Module Repair

The CAS immobiliser module (transponder box) serves as an antitheft alarm system and enables the start of BMW vehicles. Within each vehicle key there is an integrated transponder chip,and a coil ring which is fitted around the ignition lock. The transponder chip is powered by this coil from the CAS module, meaning that no battery is necessary within the key.


When your key is inserted in to the ignition, the transponder in the key is powered via the loop antenna and key data is sent to the CAS control module. If the key data is correct, an enable signal is then sent to the starter motor and the CAS module then sends the random code to the Engine Control Unit (DME / DDE) where the random code is checked against the saved random code. Only if they match, is the fuel injection released, allowing the car to start.


Common faults associated with the BMW CAS Immobiliser module
As mentioned above, some of the issues that you may encounter if you have a problem with your BMW CAS module are:

  • Immobiliser Fault Codes
  • No Communication with CAS Module
  • Vehicle Won’t Start
  • Key Not Recognised
  • Failed CAS after key programming


Most workshops will advise to replace the immobiliser module because they are unable to repair it.

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