LAUNCH      X-431 IMMO ELITE User Manual 
 
5)  Tap CAS4/CAS4+ Anti-Theft System, the following screen will appear: 
 
6)  Tap Preprocessing to perform Read Anti-Theft data, Key Matching and 
more. If it has already been preprocessed, here you can perform the relevant 
functions. The ECU will be upgraded in this process, and files need to be 
downloaded online. 
 
7)  Make sure that vehicle power supply voltage is not lower than 13V and 
stable, and then tap Yes to start preprocessing. 
22