The rotating function of certain Mercedes-Benz COMAND control knobs is known to stop working. The oftentimes broken internal plastic shaft causes this. All other functions will continue to work.
As suggested by Mercedes-Benz, there is no need to replace the entire COMAND unit. Save money by replacing the broken plastic shaft with a new aluminum version.
- TORX T10 Screwdriver
- TORX T8 Screwdriver
- Slotted 1/8″ Screwdriver
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- Aluminum Shaft
Step 1. Remove the unit from the center console of the vehicle. (This process will vary in different vehicles) When removing the switch assembly, be mindful of the wiring connector. Rough handling could lead to broken wires.
Step 2. Remove the knurled knob cover with a flat screwdriver. Rotate the knob and lift the cover from the knob incrementally. Often the cover is seized to the knob and may take time for it to shift. Avoid scratching the cover and top surface of the assembly. The assembly has sharp edges; wear protective gloves as the hand can slip during this step.
Step 3. Remove the ring and cap with a flat screwdriver. The cap holds on with an adhesive film. Handle with care as it will be reused.
Step 4. Remove the knob top screw with a T8 screwdriver.
Step 5. Remove the ten screws on the bottom with a T10 screwdriver.
Step 6. Lift and remove the stacked four components. Try to keep them in the same position for easier installation during assembly.
Step 7. Remove the four levers with a flat screwdriver. There are two tabs holding the lever. Lift the lever from the middle top section of each side.
Step 8. Remove the four lever holders with a flat screwdriver. Pry the tab from the top, then lift the lever holder.
Step 9. Lift the electrical board away from the bottom section. Push the wire harness through the brackets as you lift the board.
Step 10. Replace the broken plastic shaft with the new IE Works Shaft. Applying metal-to-plastic grease on both ends of the new shaft is recommended.
The stacked components in step six need to be installed in the same position as they were removed.
We hope you find the Mercedes-Benz Command Controller Unit Rotating Function Failure guide helpful. Check these troubleshooting and repair guides for more help on your Mercedes-Benz.