VAG1551 Scan Tool (ST), connecting and entering address word

NOTE: The VAG1551 scan tool can be used instead of the VAS5051 diagnostic tester.

Note the test conditions for each scan tool.

With the ignition off, connect VAS5051 (or VAG1551 using VAG1551/3 adapter cable) to the Data Link Connector (DLC) under the dash to the left of the steering column.

Fig 1: Connecting V.A.G 1551 To Data Link Connector (DLC) Under The Dash

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Indicated on display:

Fig 2: VAG1551 Scan Tool Display - Connecting And Entering Address Word (1 Of 9)

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¹⁾ Two operating modes are displayed alternately.

NOTE:

If there is no display, test the data link connector terminals.
See Scan tool operating instructions and the appropriate wiring diagram.
Pressing the "PRINT" button switches the VAG1551 printer on; indicator light in button comes on.
Pressing the "HELP" button on the VAG1551 scan tool prints additional operating information.

Switch ignition on.
Press the "PRINT" button to switch the scan tool printer on.
Press button -1- to select "Rapid data transfer."

Indicated on display:

Fig 3: VAG1551 Scan Tool Display - Connecting And Entering Address Word (2 Of 9)

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NOTE: The address word selects the control module that you wish to test using the scan tool. It is made up of two digits, which are listed in the relevant sections of this article.

Example: pressing buttons -0- and -3- selects the "Brake Electronics" address word 03

Indicated on display:

Fig 4: VAG1551 Scan Tool Display - Connecting And Entering Address Word (3 Of 9)

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Press the -Q- button to confirm input.

Rapid data transfer Scan Tool sends address word 03

Indicated on display after entering address word 03

NOTE: If a malfunction occurs when establishing communication between the VAG1551 scan tool and the control module, refer to the four displays and instructions that follow.

Press the "HELP" button to print a list of possible causes of the malfunction.

Fig 5: VAG1551 Scan Tool Display - Connecting And Entering Address Word (4 Of 9)
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Test power supply and Ground (GND) connections for ABS control module (w/EDL) -J104-.

Fig 6: VAG1551 Scan Tool Display - Connecting And Entering Address Word (5 Of 9)
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Test cable connections for data link connector wire-K-.

Fig 7: VAG1551 Scan Tool Display - Connecting And Entering Address Word (6 Of 9)
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If displayed:

Fig 8: VAG1551 Scan Tool Display - Connecting And Entering Address Word (7 Of 9)

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Repair the malfunction.
After repairing the malfunction, once again enter "Brake Electronics" address word 03 and press -Q- button to confirm input.

If the data link between the VAG1551 scan tool and the control module is established and works properly, the display will now show the control module identification (X), the system identification (Y), the hardware and software versions (Z), and the dealership number (W).

Fig 9: VAG1551 Scan Tool Display - Connecting And Entering Address Word (8 Of 9)

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NOTE:

The --> button is used for advancing through the program sequence.
The various On Board Diagnostic (OBD) systems to be tested are described in more detail in the relevant sections of this Repair Manual.
The control module version can only be changed by replacing the control module.
- See Parts catalog.
If the control module identification number does not appear in the display, check the diagnostic wiring.

See appropriate System Wiring Diagrams article.

Press --> button.

Indicated on display:

Fig 10: VAG1551 Scan Tool Display - Connecting And Entering Address Word (9 Of 9)

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