Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Output Diagnostic Test Mode (DTM) (function 03)
The Output Diagnostic Test Mode (DTM) is part of the electrical check.
The DTC memory must be checked after the Output Diagnostic Test Mode (DTM).
Output Diagnostic Test Mode (DTM), initiating
- Output Diagnostic Test Mode cannot be initiated, or will be interrupted if engine is running or vehicle is moving,
- Use the -C- button to exit the test sequence at any time.
- Connect VAG 1551 Scan Tool (ST), input address word 56 "Radio" and then press → button, until "Select function XX" is shown in display.
| Rapid data transfer HELP Select function XX |
Indicated on display (select function):
- Press buttons -0- and -3- to select "Output Diagnostic Test Mode" function 03.
| Rapid data transfer Q 03 - Output Diagnostic Test Mode |
Indicated on display
- Press -Q- button to confirm input.
| Output Diagnostic Test Mode → Segment test |
Indicated on display:
"AAAABBBBCCCCDDDD" will appear in the instrument cluster display.
- Switch on radio system, tune in radio program and set to middle volume.
- Press → button.
| Output Diagnostic Test Mode → Radio louder |
Indicated on display:
The volume increases.
- Press → button.
| Output Diagnostic Test Mode → Radio quieter |
Indicated on display:
The volume decreases.
- Press → button.
| Output Diagnostic Test Mode → Station search up-band |
Indicated on display:
Station search for the next radio station up-band which will appear in radio display (and in display in instrument cluster where applicable).
- Press → button.
| Output Diagnostic Test Mode → Station search down-band |
Indicated on display:
Station search for next radio station down-band which will appear in radio display and (and in display in instrument cluster where applicable).
- Press → button.
| Output Diagnostic Test Mode → END |
Indicated on display:
- Press → button.
| Rapid data transfer HELP Select function XX |
Indicated on display:
- End Output (function 06). Refer to End Output (function 06) .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.