VAG1551 Scan Tool (ST), connecting and selecting functions (check control module version)

WARNING: This page does not describe the selected car, but rather 27 other vehicles, including the 2002 Volkswagen Cabrio, 2001 Volkswagen Cabrio, 2000 Volkswagen Cabrio, 1999 Volkswagen Jetta, and 1999 Volkswagen Golf. However, it is still accessible from the selected car via links, so may be relevant.

Test requirements:

All fuses OK according to wiring diagram.
Supply voltage OK (at least 9.0 volts).

The Data Link Connector (DLC) is located in the center of the instrument panel, next to the ashtray.

Slide cover for Data Link Connector (DLC) toward left.
Connect Scan Tool (ST) or tester to Data Link Connector (DLC) using VAG1551/3 adapter cable.

Fig 1: Connecting Scan Tool To Data Link Connector

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Indicated on display:

Fig 2: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Rapid Data Transfer)

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* Two operating modes are displayed alternately

NOTE:

If nothing is indicated on display, check voltage supply for VAG 1551 scan tool according to wiring diagram.
See appropriate WIRING DIAGRAM article.
Additional instructions can be called up via the HELP button on the scan tool.
The --> button is used for advancing through the program sequence.
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.

Switch ignition on.
Switch printer on via the PRINT button (indicator lamp in button lights up).
Press button -1- to select "Rapid data transfer" operating mode 1.

Indicated on display:

Fig 3: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Enter Address Word XX)

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Press buttons 2- and -5-. "25" is the address word for "immobilizer".

Indicated on display:

Fig 4: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (25 Immobilizer)

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Press -Q- button to confirm input.

Indicated on display:

Fig 5: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Scan Tool Sends Address Word 25)

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Indicated on display:

Fig 6: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Immobilizer Coding)

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Upper line Control module part number
System identification (IMMO)

Version number 2
Bottom line Coding number
Work Shop Code - Automatically stored in the control module upon entry into the installed system.

Indicated on display:

Fig 7: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Immobilizer Coding)

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Left line Vehicle Identification Number (VIN),
Right line Identification number, of immobilizer
(14-digit, VW....)

If indicated on display:

Fig 8: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Control Module Not Responding)

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Press the HELP button to print out an overview of all of the possible malfunction causes.
Enter address word 25 for immobilizer again after correcting malfunction and press Q button to confirm.
Press --> button.

Indicated on display:

Fig 9: Identifying VAG 1551 Scan Tool Display (Cabrio From May 1999) (Select Function XX)

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Pressing the HELP button will print out an overview of all of the possible functions.