Most W204 W207 W212 ESL will damage with EIS. In this case, there are two possible reasons and solution:
ESL motor is damaged and need to replace a new motor
NEC chip is locked, theoretically it can be unlock, actually it needs to replace new ESL.
Benz ECU Test Adapter Used to brush ECU.
VVDI MB Tool Power adapter can work together with VVDI MB BGA Tool for W204 W207 W216 W164 data acquisition on W164 W204.
Xhorse VVDI MB BGA TOOL BENZ Infrared Adapter
With W164 Gateway adapter, you can easily read out EIS data in office, is much convenient than you have to read EIS data in the car.
VVDI MB NEC Key Adaptor
EIS/ELV Test Line for Mercedes
No need have car for test
Can works together with VVDI
Mercedes Test Cable of EIS ELV Test Cables for Mercedes Works Together with VVDI MB BGA Tool 12 pcs/set
When the W202/W204/W207 ESL damaged, you will need to use the VVDI MB NEC ELV adapter to works together with VVDI MB BGA tool to renew, then use MB BGA tool to reprogram key.
VVDI MB TOOL Adapter #3
Mercedes Test Cable of EIS ELV Test Cables for Mercedes Works Together with VVDI MB BGA TOOL 5pcs/set
Mercedes Test Cable of EIS ELV Test Cables for Mercedes Works Together with VVDI MB BGA TOOL 7pcs/set