Output Diagnostic Test Mode (DTM) (Function 03)

Output Diagnostic Test Mode (DTM)

The components displayed in the Output Diagnostic Test Mode (DTM) can differ depending upon the equipment fitted to the vehicle. For example on vehicles without ATA there will be no step "1" as listed in the table below.

The Output Diagnostic Test Mode (DTM) activates the following components in the stated sequence:







Special tools, testers and auxiliary items

- Scan tool VAG 1551 or vehicle system tester VAG 1552 with cable VAG 1551/3
- Adapter set VAG 1594
- Diode test lamp VAG 1527
- wiring diagram

Work sequence

- Connecting scan tool, initiating On Board Diagnostic (OBD).
Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks", under "Restraint Systems", Testing and Inspection
Convenience System, Initiating on Board Diagnostic (OBD)

Indicated on display:


Rapid data transfer HELP
Select function XX


- Operate scan tool taking into account the information on the display:
- Input 03 for "Output Diagnostic Test Mode (DTM)" function.
- Switch off ignition and remove ignition key from ignition lock.

Indicated on display:


Rapid data transfer Q
03 Output Diagnostic Test Mode (DTM)


- Confirm entry with the Q button.

Indicated on display:


Output Diagnostic Test Mode (DTM) ->


Perform press button individual tests:
See table.

Output Diagnostic Test Mode (DTM) can be terminated by pressing the "C" button.

- Press -> button.

If a component does not function:

- Continue Output Diagnostic Test Mode (DTM) to the end.