How to Change Fog Lamps on a BMW 540

1. Remove the plastic mesh located just to the right of the left fog-lamp housing and to the left of the right housing. Locate the small pin screws on the inner, top part of the fog-lamp assemblies. Use the flat-head screwdriver to carefully pull the small, inner round tab on the screw down a little.
2. Pull the larger round tab located around the smaller tab down as well to remove the pin screws. Set the screws aside so they are not misplaced. Pull the top part of the mesh away from the car so that it pivots on the base. Remove the mesh piece and set it aside.
3. Remove the 7 mm bolts that hold the fog-light assembly in place with a socket and a ratchet. Set the bolts aside. Remove the fog-light assembly by pulling the part nearest to the center of the car outward. The assembly will pivot on the edge near the outer part of the car so that it can be removed.
4. Disconnect the electrical connector that goes to the back of the fog-light assembly. Connect the wires to the new fog-light assembly. Install the new fog-light assembly by sliding the edge that goes towards the outer part of the car in first and then rotating the other side of the assembly into place. Replace the bolts. Reinstall the plastic mesh by installing the bottom first and then rotating it up. Press the two plastic pin screws into the holes.