Step 1: Check the Sunroof Fuse

• Locate the fuse box in your 2016 Mercedes-Benz C-Class. The most common location is under the dashboard or in the engine compartment.
• Consult your owner's manual to identify the specific fuse associated with the sunroof. Ensure the diagram matches your car's layout.
• Inspect the fuse for the sunroof. If the metal wire inside the fuse is broken, replace it with a new fuse of the same amperage.

 
Step 2: Try a Sunroof Reset

• Turn on the ignition without starting the engine.
• Press and hold the sunroof open switch until the sunroof fully opens, then release.
• Immediately press and hold the sunroof close switch until the sunroof fully closes, then hold the switch for an additional 5 seconds.
• This process may reset the sunroof mechanism, allowing it to function properly again.

 
Step 3: Inspect the Sunroof Track

• Open the sunroof if possible, or carefully try to access it partially.
• Visually inspect the sunroof tracks for debris such as leaves, dirt, or small objects that could impede movement.
• Use a soft brush or compressed air to clean the tracks and remove any obstructions.
• Apply a small amount of lubricant specifically designed for sunroof tracks to help smooth its operation.

 
Step 4: Check for Electrical Issues

• If the sunroof motor isn't working, check the wiring connections associated with the sunroof switch and motor.
• Remove the interior panel where the sunroof switch is located, often near the overhead lights.
• Inspect the wiring for any visible damages or loose connections and correct them as necessary.
• If you have a multimeter, check for power at the sunroof motor when the switch is pressed to ensure electricity is reaching the motor.

 
Step 5: Consult a Professional

• If none of these steps resolve the issue, it may be best to consult a professional mechanic or a Mercedes-Benz specialist.
• Complex issues with the sunroof motor or the control module may require specialized tools and expertise.
• A professional inspection can prevent further damage and ensure the sunroof is safely repaired.