Key programming for CAS4 F-Series vehicles is done trough the Keys and Start Synchronization menu > EWS Manager > Program Keys. It is a guided procedure and the software provides all the steps than need to be taken. It is important to follow all the on-screen messages, especially when it comes to working for power supply, or sequences of doing what is asked.

Important notes

• Follow the on-screen messages exactly. That applies especially to what they say about the power supply, and to the order in which they ask you to do things — a step taken out of sequence is the usual cause of a failed CAS4 job.

• CAS4 shares the EWS Manager with FEM and BDC. If you are working on one of those instead, see 9.2 FEM/BDC Key Programming.

• To back up the immobiliser data of a CAS4 before working on it, see 10.1 Save EWS Data.