Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Scan Tool VAG 1551, Connecting And Selecting Functions: Notes
DTC memory can only be erased after the checking sequence has been completed.
The main program of theABS Control Module (w/EDL) -J104- is deactivated during the On Board Diagnostic program, the ABS is not operational.
Scan Tool VAS 1551, Connecting
- Refer to test requirements SAFETY PRECAUTIONS AND TROUBLESHOOTING, BOSCH 5, FROM MY 96
-- Using adapter harness :VAG1551 /1, connect scan tool:VAG1551 to Data Link Connectors (DLC) in auxiliary relay panel 1 on left side of plenum chamber, as follows:
-- Connect black plug to black DLC.
If there is no display, check voltage supply for black DLC DATA LINK CONNECTOR VAG 1551 WIRING, CHECKING .
Indicated on display SCAN TOOL VAG 1551, CONNECTING AND SELECTING FUNCTIONS List Item:Operating modes 1 and 2 are displayed alternately
| V.A.G. - On Board Diagnostic HELP 1 - Rapid data transfer |
| V.A.G. - On Board Diagnostic HELP 2 - Blink code output |
-- Connect white connector to white DLC.
The blue connector is not required.
-- Switch on ignition or start engine.
The HELP button on VAG 1551can be used to call up additional operating instructions.
The → button is used to advance to the next step in the On Board Diagnostic program sequence.
The printer can be switched on by pressing the PRINT button (indicator light comes on in button).
-- Press button 1 for "Rapid data transfer" operating mode.
Indicated on display
| Rapid data transfer HELP Insert address word XX |
-- Press buttons 0 and 3 to insert "Brake Electronics" address word 03.
Indicated on display
| Rapid data transmission Q 03 - Brake Electronics |
-- Press Q button to confirm input.
If there is a malfunction in the communication link between the ABS control module and the scan tool:VAG1551 , refer to the displays and instructions that follow:
| Control module does not answer |
-- Press HELP button to print out a list of possible causes.
-- Follow specific recommendations below.
--
| K wire not switching to Ground HELP |
-- Indicated on display
--
| K wire not switching to B+ HELP |
-- Check wiring and connections for Data Link Connectors DATA LINK CONNECTOR VAG 1551 WIRING, CHECKING .
--
| No signal from control module |
-- Indicated on display
-- Check power supply and Ground connection toABS Control Module (w/EDL) -J104- using wiring diagram.
-- After correcting possible malfunctions, once again insert "Brake Electronics" address word 03 and press Q button to confirm input.
Indicated on display
| Error in communication link |
-- If "Error in communication link" VAG 1551 Indicates Error in Communication Link, Checking Wiring Connections appears for correcting possible malfunction.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.