The fuse box of your Mercedes Benz W124 holds important fuses for the electrical components of your vehicle. There are times when you need to go into the fuse box to change a blown fuse so the electrical currents can run properly. Once you locate the fuse box, you need to remove the plastic lid that protects the fuses inside. Once you've done that, you will be able to locate the proper fuse, pull it out with your fingers or a needle-nose pliers, and replace it with a new one.
Open the bonnet of your Mercedes Benz W124 and stand in front of the bumper.
Look in the upper right corner of the engine compartment. Locate the small sealed plastic box near the firewall and brake fluid reservoir.
Grab the lid of the plastic box and pull it. The clasps that hold it in place should release when you pull the lid off.