Data Link Connector: Testing and Inspection

Scan Tool VAG 1551 volatage supply checking

Data Link Connector Terminal Identification:

- Check for voltage supply at black Data Link connector A in vehicle
- observe polarity while performing this check:
Terminal 1 = Battery negative (-)
Terminal 2 = Battery positive (+)

If battery voltage is not obtained
- check wiring using wiring diagram, repair or replace as necessary

- switch Fluke 83 multimeter to resistance range
- connect multimeter to VAG 1551/1 adaptor cable and check for continuity


Note: The 16 pin DLC connector was phased in during the 1994 model year. If vehicle has the 16 pin DLC, use chart below.

16-Pin Data Link Connector Pin Source I.D. And Location: