Easy Checker Immobiliser System Fast Tester for Mercedes Benz BMW Audi VW Support car model Support for all models for Mercedes Benz 1998 2010 support all models for BMW 1995 2010 support for Audi VW new smart key How to use Easy Checker for Benz car model Put Easy Chcker on the EIS put your IR key into EIS Light on and not off then EIS and key all ok Light on then off then EIS ok key not ok Light on and not off but car still can not start please check ESL Steering wheel lock and Key whether ok Light not on then EIS not ok for BMW Car model EWS system Put Easy Checker on EWS no need insert key Light on means EWS ok can used on E46 E39 E53 Insert Easy Checker into EWS insert key in Light on not off then Key and EWS all okLight on then off then EWS ok key not okLight on and not off but car still not start please check whether key is okCAS System for 1 series 3 series 5 series 7 series Put Easy Checker directly on CAS and insert key inLight on and not off then CAS and key all okLiht on then off then CAS OK but key not okfor AUDI VW Car model Smart Key slot keyPut Easy Checker directly on the EZS and insert key inLight on and not off then EZS and key okLight on then off then EZS ok key not okPackage including 1 X Easy Checker