Connect the cables from VVDI MB tool OBD to ECU directly and give power supply. Every function is fine. If you using Benz ECU test adapter cable, please check did the can high and can low of the plug is short circuit. Some times there will have short circuit on the serial port of the ECU adapter.
In my case I’m not using resistance.
|1||K-Line||Ignition control (EZS), air-conditioner (KLA), PTS, safety systems (Airbag, SRS, AB) and some other|
|3||TNA||TD engine rotation speed|
|6||CAN-high||CAN-High (including AirBag system in W203, W209, W220, W240, R230, ?215 after 2004y)|
|7||K-Line||Engine control diagnostic (ME/MSM/CDI)|
|9||K-Line||ABS, ASR, ESP, ETS, BAS diagnostic|
|11||K-Line||Gearbox and other transmission components (EGS, ETC, FTC)|
|12||K-Line||All activity module (AAM), Radio (RD), ICS, …|
|13||K-Line||AB diagnostic – safety systems|
|15||K-Line||IC, KI), TAU, LWR diagnostic|
15 & 16: 12 Volts
41: CAN High
54: CAN Low