Here are the step-by-step instructions for opening the trunk of a Mercedes S600:
1. Press the trunk release button on the driver's door. This is the most common way to open the trunk.
2. If the trunk does not open, try using the key fob. Press the trunk release button on the key fob twice within three seconds.
3. If the trunk still does not open, you can try opening it manually. Pull on the trunk release lever, which is located in the trunk.
If the trunk does not open using any of these methods, there may be a problem with the trunk release mechanism. In this case, you should take your car to a qualified mechanic to have the problem diagnosed and repaired.