Convenience System, Initiating On Board Diagnostic (OBD)

On Board Diagnosis (OBD) For The Central Locking System, Initiating

Test prerequisites:
- Voltage supply and fuses for the respective system OK.
- To initiate the On Board Diagnosis (OBD) the ignition must be switched on "Terminal 15 on".

NOTE:
- If the display remains blank, check V.A.G 1551 voltage supply referring to Electrical Wiring Diagram.
- Additional operating information can be printed out depending on the program by pressing the HELP button of V.A.G 1551.
- The -> button serves to advance the program sequence.
- The PRINT button is used for switching on the printer (warning lamp in key lights up).
- Connecting scan tool. Scan Tool, Connecting

- Switch on ignition.
- Switch on printer with the Print button (indicator lamp in button lights up).

Indicated on display:

Rapid data transfer HELP
Enter address word XX

Address word for central locking: 35

Indicated on display:

Rapid data transfer HELP
Enter address word XX

- Press buttons -3- and -5-.

Indicated on display after entering address word 35:

Rapid data transfer Q
35 Central locking

- Confirm entry with -Q- button.

and the following is indicated on display:

Indicated on display:

Rapid data transfer
Tester sends address word 35

The scan tool V.A.G 1551 display will show the control unit identification, e.g.:

1C0962258F Central locking 0044 ->
Coding 00256 WSC 06037

- Press -> button.

Indicated on display:

Rapid data transfer HELP
Select function XX

NOTE:

Rapid data transfer HELP
Control unit does not answer

- If one of the malfunction messages opposite appears in the display, the possible causes of the malfunction can be printed out with the HELP button.

Rapid data transfer HELP
K wire not switching to positive.

- When doing this the ignition must be switched on.

Rapid data transfer ->
No signal from control unit.

- Malfunctions have occurred at the start of or during the program (external interference?).

Rapid data transfer ->
Fault in communication build up

- Check diagnosis wires as well as voltage supply and ground (GND) connection.

- After correcting the possible causes of the fault, once again enter the address word 35 for "Central locking" and confirm with the -Q- button.

Indicated on display after entering the address word 35:

Rapid data transfer
Tester sends address word 35

The scan tool V.A.G 1551 display will show the control unit identification, e.g.:

1C0962258F Central locking 0044 ->
Coding 00256 WSC 06037

- Press -> button.

Indicated on display:

Rapid data transfer HELP
Select function XX

List of selectable functions
01 - Checking control unit version
02 - Check DTC memory
03 - Output Diagnosis Test Mode (DTM)
05 - Erasing DTC memory
06 - Ending output
07 - Code control unit
08 - Read measured value block
10 - Adaptation

Indicated on display:

Rapid data transfer HELP
Select function XX

NOTE:
- A list of possible functions is printed out after pressing the HELP key.
- Do not select further functions, which can be printed out after pressing the HELP button.
- After the functions have been completed the V.A.G 1551 returns to the mentioned start position.