135i cars in Europe come equipped with Rear Foglights. I assume BMW NA thinks American’s don’t know the proper time to use Rear Foglights so this feature is not on the US spec cars. Since the Rear Foglights work off of the Adaptive Brake Lights, the bulbs are already in place. In order to activate the Rear Foglights on the 135i, you need to replace the headlight switch with the European version.
Installation
Installation requires a T-20 Torx driver.
To begin installation, locate and remove the 2 T-20 Torx screws at the bottom of the headlight switch panel.
Remove the driver side vent cover by pulling up.
Once the vent cover is removed, you will find 2 more T-20 Torx screws. Remove them.
With the screws removed, you can lower the panel. Pull the leading edge of the side panel away from the dash. There are 2 clips that will free themselves. You do not need to remove the panel entirely, just enough to un-dock these clips.
The Headlight Switch panel will lower down. You only need to lower it, you do not need to remove it.
With the screws removed, you can lower the panel. Pull the leading edge of the side panel away from the dash. There are 2 clips that will free themselves. You do not need to remove the panel entirely, just enough to un-dock these clips.
With the panel lowered enough to see the back of the switch, you will see the electrical connector. The connector has a gray lock that when you move it toward the passenger side of the car, will unlock the connector. Unlock the connector and disconnect the wiring harness.
With the harness unconnected, you can remove the switch from the panel. There are 4 clips that hold the switch in place. You will need to press in the clips and remove the switch. With the switch removed, install the new switch into the panel. Make sure all 4 clips fully dock. Listen for the clip sounds and push on the switch from the front to make sure they are docked.
With the switch installed, reconnect the wiring harness and lock it in place. Raise the front of the panel up and install the 2 T-20 screws at the base of the vent. Install the side panel making sure the 2 clips engage. Re-install the vent trim panel and re-install the 2 T-20 screws at the bottom of the headlight trim panel.
You are done. when the Rear Foglights are active, you will get a rear foglight indicator in the instrument cluster.
Tail lights on
Rear Foglights on
