How to use YH BMW CAS3 CAS4 Test Adapter? (Youtube video)

With one YH BMW CAS3 CAS4 Test Adapter, you can test: whether the CAS is broken, whether key programming is successful, whether the key frequency is accurate etc.

What can YH CAS3 CAS4 Test Adapter do?

  1. Test whether CAS program is running normally.
  2. Test whether CAS data is valid.
  3. Test whether the key is outputting inductive signal.
  4. Test whether the key is legal.


What is the meaning of YH CAS Tester indicator light?

  1. The indicator D2 flashes to indicate that the tester CAN Bus communicates with the CAS module normally.
  2. The indicator light D4 is on for a long time, indicating that the CAS module data is valid.
  3. Put the key into the induction coil, and the D3 indicator flashes, indicating that the key is outputting LF signal.
  4. If the tester beeps, indicating that this key is the valid key of the corresponding CAS module, or the newly programmed key is learned successfully.


Testing CAS3:

Testing CAS4: