Here are all Mercedes-Benz EIS/EZS pinouts for table connection and test. Just for sharing purpose, credit to DK forum member volism .
W169 W211 W209
W202 W208 W210
W203 W463 W639
W204 W207 W212
W212 new, W246 W166 EZS
W215 W220 W230
W221 new type
W221 old type
W639 new
W906
W164 NEC new
W164 NEC Old
W166 W246
W246 one plug
VVDI PROG Benz EZS/EIS adapters