Preliminary Work
- Remove luggage compartment lamp. → 964019 REMOVING AND INSTALLING LUGGAGE COMPARTMENT LAMP
- Fold carpet lining in luggage compartment at the left aside.
- If you are replacing the control unit for all-wheel drive (PTM), the values and coding must be read out using PIWIS Tester II 9818 before removing the faulty control unit for all-wheel drive (PTM). → WM 399555 REPLACING CONTROL UNIT FOR ALL-WHEEL DRIVE (PTM)