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- switch on the drive switch (step 2, drive position),
- Turn system selector switch to heating-ventilation-climate control (HLK) position (see electrical key),
- Press check key, climate on/off key and reheat key simultaneously.
- After 10 seconds, four segments and the text "Ac" appear in the display.
- Press the "−" key to switch in the ventilation function (no climate control). Press the "+" key to switch in the climate control function.
- After 30 seconds, the control unit accepts the relevant setting and is then configured for the corresponding function.
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