Test requirements:

Check fuse for function according to wiring diagram.
Connect VAS5051 tester or VAG1551 scan tool. See VAS 5051 TESTER OR VAG 1551/1552 SCAN TOOL (ST), CONNECTING .
Switch on ignition.

NOTE:

If nothing is indicated on display, check voltage supply for VAG 1551 scan tool according to wiring diagram.
Additional instructions can be called up via the HELP button on the scan tool.
The --> button is used for advancing through the program sequence.
An incorrect entry can be canceled using the C- button.
Function 00 "Automatic test sequence" can be performed in operating mode 1 "Rapid data transfer". This automatically checks all control modules installed in the vehicle.

Indicated on display

Fig 1: Identifying Scan Tool Display - Initiating Navigation System IV OBD (1 Of 7)

Courtesy of AUDI OF AMERICA, INC.