Expert BMW CAS - FEM - BDC Repair services in Ilkeston, Derby, and Nottingham.
Call Us Now: 07783630237JK Car Electrics specialises in the repair and replacement of BMW's critical security modules: CAS (Car Access System), FEM (Front Electronic Module), and BDC (Body Domain Controller). These units control immobiliser functions, key programming, central locking, and many other vehicle systems. When they fail, your BMW may not start or respond to keys β we can diagnose, repair or replace these modules and get you back on the road.
Car Access System
Found in E-Series BMWs (E60, E65, E70, E87, E90, etc.). Controls immobiliser, key recognition, central locking, and starter authorisation.
Versions: CAS1, CAS2, CAS3, CAS3+
Front Electronic Module
Found in F-Series BMWs (F20, F30, F32, F10, etc.). Multi-function module controlling immobiliser, lighting, wipers, windows, and central locking.
Common failure: Water ingress
Body Domain Controller
Found in G-Series BMWs (G20, G30, G05, etc.). Evolution of the FEM with expanded functions including gateway communication.
Latest security technology
If your BMW is experiencing any of these issues, you may have a failing security module:
Full diagnostic assessment to identify whether your CAS, FEM or BDC is the cause of the fault.
Component-level repair of faulty modules where economically viable.
Supply and program replacement modules β new or quality used units.
Transfer critical data from your failed module to a replacement unit.
Program new keys after module replacement or add spare keys to your vehicle.
Synchronise the security data between modules after replacement.
The CAS module (CAS1, CAS2, CAS3, CAS3+) is found in E-Series BMWs from approximately 2001-2013. Common issues include internal component failure and EWS corruption.
The FEM (F-Series) and BDC (G-Series) are complex multi-function modules. Water ingress is the most common cause of failure, typically from blocked sunroof drains or windscreen seal leaks flooding the passenger footwell.
We can supply and program used/second-hand CAS, FEM, and BDC modules at a fraction of new dealer prices. This is often the most cost-effective solution:
We find a compatible used module
Clear all previous vehicle data
Configure to your VIN and vehicle
Transfer or program your keys
We offer specialist BMW security module services that most garages simply cannot provide.
We verify vehicle ownership before undertaking any immobiliser or security module work. Please have your V5C/logbook and photo ID available when booking.
My BMW won't start and shows "Key Invalid" β is it the CAS/FEM?
Possibly. This message indicates the immobiliser isn't recognising the key. It could be a faulty key, CAS/FEM/BDC issue, or communication fault. We can diagnose the exact cause.
My footwell is wet β will my FEM be damaged?
Water ingress is the leading cause of FEM failure. If your footwell is wet, the FEM may already be damaged or at risk. Have it inspected as soon as possible to prevent complete failure.
Can you repair a water-damaged FEM/BDC?
Sometimes. It depends on the extent of the damage. We can assess the module and advise whether repair is viable or if replacement is the better option.
Can you fit a used CAS/FEM/BDC from another car?
Yes. We can source compatible used modules, virginise them (remove previous vehicle data), and program them to your vehicle with your keys.
Will I lose my mileage if the module is replaced?
Not necessarily. We can often extract mileage data from the failed module and transfer it to the replacement. CAS modules store mileage; FEM/BDC do not typically store it.
Do I need to replace my keys after module replacement?
Usually no. We can transfer your existing key data to the new module in most cases. If keys cannot be transferred, we can program new keys.
How much does CAS/FEM/BDC repair or replacement cost?
Prices vary depending on the module and whether repair or replacement is needed. Contact us with your vehicle details for a specific quote β we're typically significantly cheaper than main dealer.
What areas do you cover?
We provide mobile BMW module repair services throughout Derbyshire, Nottinghamshire and the wider East Midlands including Derby, Nottingham, Ilkeston, Long Eaton, Beeston, Mansfield, Chesterfield and surrounding areas.
Core coverage: Ilkeston, Derby, Nottingham. Extended mobile service: wider Derbyshire, Nottinghamshire & parts of Leicestershire within a 30βmile rapid dispatch radius.
Serving: Ilkeston, Nottingham, Derby, Leicester, Mansfield, Chesterfield, Burton upon Trent, Loughborough, Long Eaton, Beeston, Sutton-in-Ashfield, Ashbourne, Newark-on-Trent, Matlock, Alfreton, Heanor, Ripley, Belper, Arnold, Hucknall, Swadlincote, Ashby-de-la-Zouch, Coalville & nearby villages.
Fully insured, ID & DBS checked for professional on-site work. Request a quote.