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.
XHORSE Remote Tester Radio Frequency (FR) Infrared (IR) can detect frequency as well as infrared working or not.