Features: Benz / BMW / Audi / VW car does not start, EASY-CHECKER can quickly diagnose Benz EIS / BMW CAS / Audi EZS / public EZS lock or key issue, good or bad rapid diagnosis within 10 seconds. EASY-CHECKER intelligence operation, not connected to the computer, this product is the world's first. Meanwhile EASY-CHECKER is the best automotive repair products. EASY-CHECKER support models: Support for all models Mercedes-Benz 1998-2010; support all models of BMW 1995-2010; support the Audi / VW new smart key. EASY-CHECKER use: Mercedes-Benz models: The EASY-CHECKER placed in the lock; the infrared key into the lock. Lighting does not go out; that the normal lock and key. After switch-off: that the normal lock, key bad. Switch-off but the car still can not not launch: Please check the ESL steering wheel lock or key is working. Not light, said: lock bad. BMW models: Diamond Key (EWS): two hours by vehicle system test method EASY-CHECKER will be placed directly on the lock (do not need to insert the key) A switch that locks the normal (for: E46/E39/E53) The EASY-CHECKER placed directly into the lock (insert key) Lighting will not be extinguished: that the normal key and lock After switch-off: that the normal lock, key adverse Lighting would not go out, but the car still can not launch: Please check whether the normal key Intelligent Key slot-key (CAS 1 series / 3 Series / 5 Series / 7 Series) EASY-CHECKER will be placed directly into the key in the lock MIL does not go out: that the normal lock and key After light switch-off: that lock properly; key bad Audi / VW models: Intelligent Key slot-key EASY-CHECKER will be placed directly into the key in the lock MIL does not go out: that the normal lock and key After light switch-off: that lock properly; key bad