Volkswagen Workshop Service and Repair Manuals > Golf Mk3 > Body | Body self-diagnosis | Self diagnosis, V.A.G Inspection Service | Self-diagnosis of airbag system ? 08.94 | Function | Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version)

Connecting fault readerV.A.G 1551 and selecting function (reading out control unit version)

Connecting fault reader -V.A.G 1551- and selecting function (reading out control unit version)

l	All fuses according to current flow diagram OK.

l	Battery voltage OK (at least 9 V).

Note

t	The airbag system is switched off during self-diagnosis.

t	The fault memory can be erased only after a repair has been made and the memory has been read.

With ignition switched off, connect fault reader -V.A.G 1551- to the diagnostic connector using the diagnostic cable -V.A.G 1551/1- as follows:

–	Unclip diagnostics connection cover under heating and ventilation controls.

–	First connect black plug on diagnostic cable -V.A.G 1551/1- to black agnostic connector in vehicle (voltage supply).

Indicated on display:

V.A.G self-diagnosis                HELP

1-Rapid data transfer*

¹⁾	Is displayed alternately

Note

If the display remains blank, do not connect the white plug! If this is the case, check the voltage supply for the fault reader -V.A.G 1551- according to current flow diagram.

V.A.G self-diagnosis                HELP

2-Flash code output*

–	Connect white plug of fault reader -V.A.G 1551- to white diagnostic connector in vehicle. The blue plug is not required.

Note

t	Additional operating information depending on the programme can be printed out by pressing the HELP key on the fault reader -V.A.G 1551-.

t	The → key is used for advancing the programme sequence.

t	The PRINT key is used for switching on the printer (warning lamp in key lights up).

–	Switch on ignition.

–	Press key -1- for “rapid data transfer” mode.

Indicated on display:

–	Press keys -1- and -5- (the address word of the vehicle system to be tested “Airbag” is entered with 15).

Rapid data transfer                 HELP

Input address word XX

Indicated on display:

–	Confirm entry with the Q key.

and then the display shows e.g.:

Rapid data transfer                   Q

15 Airbag

The control unit identification number is displayed:

Note

1H0 959 656                 AIRBAG IS 55

t	If one of the adjacent fault messages appears in the display, the possible causes of the fault can be printed out with the HELP key.

Rapid data transfer                 HELP

Control unit not answering!

t	Ignition must be switched on.

Rapid data transfer                 HELP

K wire does not switch to positive!

t	Faults have occurred at the start of or during the programme (external sources of faults?).

Rapid data transfer                   ->

No signal from control unit!

t	Check diagnostic cables and also voltage supply and earth connection.

–	After rectifying the possible causes of the fault, once again enter the address word 15 for “Airbag” and confirm with the Q key.

Rapid data transfer                   ->

Fault in communication

Indicated in display after entering the address word 15:

and then the following appears in the display:

Rapid data transfer

Tester sends the address word 15

Control unit identification number is displayed.

–	Press → key.

1H0 959 656                 AIRBAG IS 55

Indicated on display:

Note

An overview of the possible functions will be printed out when the HELP key is pressed:

Rapid data transfer                 HELP

Select function XX

Overview of functions	Page
01 - Interrogate control unit version	→ Chapter
02 - Read fault memory	→ Chapter
05 - Erase fault memory	→ Chapter
06 - End output	→ Chapter

Only the functions listed can at present be used for self-diagnosis.

When the → key is pressed, the fault reader -V.A.G 1551- program will return to its initial position.

Shown in display (function selection, e.g. 02 - Read fault memory):

Rapid data transfer                   ->

Fault in communication

Rapid data transfer                 HELP

Select function XX

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Body self-diagnosis / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of airbag system ? 08.94 / nction/">Function
Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version)

Reading fault memory > < Function

Volkswagen Workshop Service and Repair Manuals

Golf Mk3

Body Body self-diagnosis / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of airbag system ? 08.94 / nction/">Function Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version)

Body Body self-diagnosis / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of airbag system ? 08.94 / nction/">Function Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version)

Body
Body self-diagnosis / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of airbag system ? 08.94 / nction/">Function
Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version)

Body
Body self-diagnosis / Self diagnosis, V.A.G Inspection Service / Self-diagnosis of airbag system ? 08.94 / nction/">Function
Connecting fault reader V.A.G 1551 and selecting function (reading out control unit version)