The new Mercedes-Benz and NEC BGA key lock is difficult to identify good or bad, Its inconvenience for our maintenance work, we have developed a special model tester for W204 W207 W212, you can identify the lock and key  good or bad. Without connecting direction lock ELV, will be able to test out the lock and key  good or bad.

Equipment Instructions:

1, according to FIG connected device, powered 12-volt, LED2 LED1 will light on for 1 second

Insert the key into LED1 flashes for, then hear a buzzer sound, the key to dial out loud a sound LED1 light stops blinking, indicating that the lock and key is normal. (ACC detected when the buzzer 1 sound detected legitimate key LED1 light has been flashing)

The following is reference for test result.

2, if the key is inserted, LED2 will light, no sound, no sound key allocated, indicating that the lock is good, the key is not normal, there may be a normal key lock is not normal.

3, the key new match, just insert lock, key lights, set aside the key, and then insert the key lights Jimie, then hear a buzzer sound, set aside key ring for one sound, indicating that the key match success. Some want to call waiting five to recognize the new key, press their own experiences to identify good and bad.