Output Diagnostic Test Mode (DTM) (Function 03)

Output Diagnostic Test Mode

The function "Crash output" is checked with Output Diagnostic Test Mode.

When airbags are ignited the central locking is switched to "unlock" and the interior lights are switched "on."


NOTE:
- Before performing the Output Diagnostic Test Mode, switch central locking to "lock" (operate interior light switch).
- Switch interior light switch to position "door contact."
- After completing the Output Diagnostic Test Mode the central locking controls are not active until the ignition has been switched off and on again.


- Connect Scan Tool. Scan Tool Connecting and Initial Checks

Perform function "03 Output Diagnostic Test Mode"

Indicated on display


Rapid data transfer HELP
Select function XX


- Press keys -0- and -3-.

Indicated on display


Rapid data transfer Q03
Output Diagnostic Test Mode


- Confirm with -Q- key.

Indicated on display


Output Diagnostic Test Mode ->
Unlock central locking signal


Central locking must switch to "unlock" and the interior lights must switch "on."

Indicated on display


Output Diagnostic Test Mode ->
End


- Press -> key.

During test and assembly work DTC can be recognized from other control modules like e.g. plug disconnected. Therefore, check all control module DTC memory and erase, as follows:


- Press -0- key twice for address word "Automatic test sequence" and confirm with -Q- key. VAG 1551 transmits all known address words one after the other.

When a control module answers with its identification the number of stored DTCs appears on the display or "No DTC recognized".

System DTCs will be displayed one after another and printed out. Scan Tool (ST) VAG 1551 will then transmit the next address word.

Automatic Test sequence has ended when the following is indicated on display:


VAG - On Board Diagnostic HELP
1 - Rapid data transfer
2 - Blink code output


NOTE:
If a DTC is recognized:
- Correct DTC
- Erase DTC memory (function 05).
- Interrogate DTC memory again (function 02).