BMW CAS1 – CAS2 – CAS3 Car Access System – Repair Service


The BMW CAS 4 (car access system) manufactured by Siemens VDO, commonly suffers from internal hardware and software failures resulting in intermittent to complete none start

These units fails in many ways with the some of the common failures listed below

  • Hardware damage causing no crank
  • Output circuit terminal 50 faulty
  • various fault codes relating with unit faulty
  • corrupted software due to failed programming

This repair service covers the test, repair and reprogramming for this module, that includes all synchronisation of immobiliser data  to match your ECU and Key.

Our specialised equipment allows us to fully recover the flash data and restore it back to its working condition.

Give us a call  and send your unit for inspection.


MotorTronics provides a prompt test and repair service for your CAS (Car Access System) Module, The module goes through various signal test and repair processes to ensure all parameters respond correctly, only after this, we pass the module and is ready for dispatch.
All that is left for you to do is
1. Click buy it now
2. Fill in the form under the shipping section
3. Send your Cas unit along with your key and ECU with the packaging Slip
4. Await repair while we have your module(s)
5. Once received simply Plug it in and turn the key.