[caveat: I am working on the assumption that the Z4M and Z4 share the same rear light cluster. If this is wrong please let me know and I will try and get the posting moved to the M section of the forum]
For a wiring project I am working on with my Z4MC I am trying to figure out what each of the wires from the car into the rear light fitting are. I have established which wire is negative/ground. I have a DC power supply and an open ended connector block so I can provide power to each of the wires into the light fitting individually and watch which light comes on in the cluster. Each wire into the light fitting, when given power, is turning on a different section of the light cluster. Using the cars controls and trial and error I can figure out what some but not all of the bulbs in the light cluster are.
Given the sketch of the rear left light cluster below you can see I have identified some but not all of the light cluster sections. Could someone tell me what sections labelled B and D are please? I am guessing one should be the rear fog light? I have tried the "rear fog light" button in the cabin but dont see any noticeable difference in the cluster.

For a wiring project I am working on with my Z4MC I am trying to figure out what each of the wires from the car into the rear light fitting are. I have established which wire is negative/ground. I have a DC power supply and an open ended connector block so I can provide power to each of the wires into the light fitting individually and watch which light comes on in the cluster. Each wire into the light fitting, when given power, is turning on a different section of the light cluster. Using the cars controls and trial and error I can figure out what some but not all of the bulbs in the light cluster are.
Given the sketch of the rear left light cluster below you can see I have identified some but not all of the light cluster sections. Could someone tell me what sections labelled B and D are please? I am guessing one should be the rear fog light? I have tried the "rear fog light" button in the cabin but dont see any noticeable difference in the cluster.
