VAG 1551 ((VAG 1552) Scan Tool (ST), connecting and selecting functions: Requirements

All fuses OK per wiring diagram
Battery positive voltage (B+) OK
Ignition switched on or engine running (engine speed less than 3000 RPM)

Connect VAG 1551 (VAG 1552) scan tool to 16-pin Data Link Connector (DLC) to left of steering column, using adapter cable VAG 1551/3.

Fig 1: Connecting Scan Tool To 16-Pin Data Link Connector
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Indicated on display:

Fig 2: Scan Tool Display Operating Modes 1 And 2

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Operating modes 1 and 2 are displayed alternately.

NOTE: If no readout is displayed of the VAG 1551 Scan Tool, check Data Link Data Link Connector (DLC) wiring. See DATA LINK CONNECTOR (DLC), CHECKING WIRING CONNECTIONS .

NOTE:

Additional operating information can be displayed by pressing the HELP button on VAG 1551 Scan Tool.
The --> button is used for moving forward within program.
Pressing PRINT button switches on the printer (indicator lamp in button comes on).
The DTC memory cannot be erased until it has been checked.

Switch ignition on or start engine, respectively.
Press -1- button to select "Rapid Data Transfer" operating mode 1.

Indicated on display

Fig 3: Scan Tool Display - Insert Address Word XX

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Press buttons -0- and -8- to select "AC/Heating Electronics" address word 08.

Indicated on display

Fig 4: Scan Tool Display - 08, AC/Heating Electronics

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Press -Q- button to confirm input.

Indicated on display after selecting address word 08:

Fig 5: Scan Tool Display - Address Word 08

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After a short time A/C control head identification, coding and dealership code of VAG 1551 Scan Tool are displayed:

Fig 6: Scan Tool Display - A/C Control Head Identification, Coding And Dealership Code

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Control module identification: 4D0 820 043 C D2 AC fully automatic.

Coding example:

A/C CONTROL MODULE CODING EXAMPLE

Code	Country	Engine	Compressor
00182	USA	8-cylinder	Nippondenso/Denso

NOTE:

The compressor manufacturer "Nippondenso" has changed its name to "Denso."
Depending on the VAG 1551 Scan Tool card version, the 1st and 2nd digit on Scan Tool may not be displayed (e.g. 182 instead of 00182)
Coding A/C control head -E87-. See CODE CONTROL MODULE (FUNCTION 07) .
WSC ZZZZZ indicates the dealership code of the VAG 1551 with which the last coding was performed.
DXX indicates the software version of the A/C control head -E87- and has no application for OBD.

SCAN TOOL AVAILABLE FUNCTIONS

List of functions	Go to
01 Check Control Module Versions	VAG 1551 ((VAG 1552) SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS
02 Check DTC Memory	DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, CHECKING (FUNCTION 02)
03 Output Diagnostic Test Mode	OUTPUT DIAGNOSTIC TEST MODE (DTM) (FUNCTION 03)
04 Basic Setting	BASIC SETTING (FUNCTION 04)
05 Erase DTC Memory	DIAGNOSTIC TROUBLE CODE (DTC) MEMORY, ERASING (FUNCTION 05)
06 End Output	END OUTPUT (FUNCTION 06)
07 Code Control Module	CODE CONTROL MODULE (FUNCTION 07)
08 Read Measuring Value Block	READ MEASURING VALUE BLOCK (FUNCTION 08)

Only the functions listed here can be used for AC/Heating Electronics OBD program.

Press => button.

Indicated on display (function selection, for example, 02 - Check DTC Memory):

Fig 7: VAG 1551 Scan Tool - Checking Control Module Versions (1 Of 8)

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If one of the following DTC messages is displayed:

NOTE:

A list of the possible functions is printed out after pressing the HELP button:
After pressing the --> button, the program of VAG 1551 returns to the starting position.

If one of the following DTC messages is displayed:

Fig 8: VAG 1551 Scan Tool - Checking Control Module Versions (2 Of 8)

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Press the HELP button to print out list of possible causes. See Fig 9 .

Fig 9: VAG 1551 Scan Tool - Checking Control Module Versions (3 Of 8)
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Check wiring to Data Link Connector (DLC) according to the wiring diagram. See Fig 10 and DATA LINK CONNECTOR (DLC), CHECKING WIRING CONNECTIONS .

Fig 10: VAG 1551 Scan Tool - Checking Control Module Versions (4 Of 8)
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If this display appears at the beginning of or during the OBD program, malfunctions have occurred and data transfer is no longer possible between VAG 1551 Scan Tool and A/C control head -E87-.

Fig 11: VAG 1551 Scan Tool - Checking Control Module Versions (5 Of 8)

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Check wiring to DLC. See DATA LINK CONNECTOR (DLC), CHECKING WIRING CONNECTIONS , according to the wiring diagram.
After repairing the possible causes of the malfunction, once again select address word 08 for "AC/Heating Electronics" and confirm entry with -Q- button.
Indicated on display after selecting address word 08:

Fig 12: VAG 1551 Scan Tool - Checking Control Module Versions (6 Of 8)
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The following display appears: control head identification, coding and dealership code of VAG 1551 are displayed.

Fig 13: VAG 1551 Scan Tool - Checking Control Module Versions (7 Of 8)
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- Press => button.
Indicated on display (function selection, e.g. 02 - Check DTC memory)

Fig 14: VAG 1551 Scan Tool - Checking Control Module Versions (8 Of 8)
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