I do believe that we had this discussion before.

RC5/EC5 controllers are preprogrammed and cannot be reprogrammed by use of T4. They can be ordered as:
- Single (driver) airbag controlles - part number for ordering new is YWJ101220
- Dual airbag controllesr - part number for ordering new is YWJ101230

AB Autoliv controlles are programmable by T4 and are bought unprogrammed as new with part number YWJ000290

For RC5/EC5 controllers you have various numbers written on them and if you are buying them as second hand you will have advertised only these part numbers. What is recognized is as follows:
- Single (driver) airbag controllers can have any of following numbers written on them: YWC001600; YWC105400; YWC105320
- Double airbag controllers can have any of following numbers written on them: YWC001610; YWC105410; YWC13380

Since same controlles are used across MG-Rover range of cars other numbers might as well be written on controllesr, but it would need to be checked if they are single airbag or dual airbag modules. Check might be easy if you know from which car controller is coming.

 

Read More...