This is the connector you need to unplug from the EBTCM to see if the car starts. The circled pin location is the serial data line recomended to check resistance between here and the tan serial data wire to the ALDL. this is not a complete test of the serial data lines but if it fails here, then is a sign of the need to actually check the rest of the serial data pins at the other modules.
You want to see low resistance, good continuity, under 2 OHM (MAX).