Output Diagnostic Test Mode (DTM) (Function 03)

Output Diagnostic Test Mode (DTM) (Function 03)


NOTE:
- Output Diagnostic Test Mode (DTM) must be performed with engine not running, ignition switched on and Climatronic switched off (Switch Climatronic off by pressing button to reduce blower speed.
- For definitive results, output DTM must be performed when the outside temperature is at least 12 °C (53 °F) as displayed on the A/C control head.
- Automatic regulation of Climatronic does not take place during output DTM.
- If necessary, output DTM can be repeated several times.


Output Diagnostic Test Mode (DTM), initiating
- Connect VAG 1551 Scan Tool (ST) and enter address word "08 AC/Heating electronics" and then press -> button, until "Select function XX" appears in display. Initiating and Checking Control Module Versions

Indicated on display (function selection):


Rapid data transfer HELP
Select function XX


- Press buttons -0- and -3- to select function 03 Output Diagnostic Test Mode (DTM).

Indicated on display:


Rapid data transfer Q
03 - Output Diagnostic Test Mode


- Confirm input with -Q- button.

Indicated on display:


Output Diagnostic Test Mode
Self test


The following tests are performed:
- A/C control head -E87- display. Refer to Relays and Modules / Control Module HVAC under Heating and Air Conditioning. Testing and Inspection

- Functional test of the 4 flap motors
- Electrical circuit to fresh air blower -V2- is tested.
- Climatronic control module switching sequence for A/C clutch - N25- is tested.
- All sensors are checked.

After approx. 30 seconds, the checks are completed.

Indicated on display:


Function is not recognized or cannot ->
be performed at the moment!


- If "Function is not recognized or cannot be performed at the moment" appears in display, output DTM has been concluded.
- Press -> button.


NOTE: After completing output DTM, always check DTC memory.