Data Link Connector: Description and Operation

For diagnosis of the car's electronic systems, a 16-pin data link connector is located under the dashboard adjacent to the steering column.

Current is supplied to the data link connector via fuse 13. The connector has power ground on pin 4 and signal ground on pin 5.

The following systems are connected to the data link connector as indicated:
Pin 1 Main instrument display panel 2(540B)
Audio 2 and 3 (359B,C)
SID units 2 and 3 (541B, C)
ACC unit (216)

Pin 4 Power ground
Pin 5 Signal ground
Pin 6 Lamp-flash code (I lead)
Motronic 2.10.2
Motronic 2.8.1
Pin 7 TCM (502)
Motronic 2.10.2 (505)
Motronic 2.8.1(510)
Trionic (430)
Pin 8 Airbag (331)
ABS (547)
ICE (500)
TCS (507)
Anti-theft alarm (289)
Electrically adjustable driver's seat (357)
Pin 9 Main instrument display panel 2(540B)
Audio 2 and 3 (353B, C)
SID units 2 and 3 (541B, C)
ACC unit (216)
Pin 11 Electrically adjustable driver's seat (357K)
Pin 16 Power supply (+30 circuit)