Well, this is all very weird. Spend the complete day to figure out what is going on.
First of all: I had to find out the real wiring of my tail and head lamps. Unfortunately I have no diagram of those and could not find one online. Anyway, figured that out.
Then like Ross said, Black is Ground and Brown is Running light. Yellow is the Turn light.
However, before I even came to this point, I switched the car on this morning and the tail lights were illuminated right away. First I thought, the stop switch must be bad. Disconnected the stop switch, but no change. Then I found out that on the top side of the switch I have 12V as supposed to and on the bottom side around 8V coming from somewhere. I checked the connection back to the BCM C2 54 was also getting the 8V and that seems to be enough to switch on the tail lights. Hmm, then I looked for the C201 plug which I could not find until I remembered that this was one of the plugs which were cut of of the harness.
Then I disconnected the C3 Plug of the FBU. And the 8V were gone. For the moment... Aha, so something from the FBU was feeding voltage back to the system. Tried to figure out where it came from and ended up cutting the wires to C3 F3 and F4 one by one.
I have now identified the cable which comes from the 3rd brake light and the cable which comes from the Stop lamp switch, I also found the wire which goes to the Engine Control Module. Now the tail light works as expected. Running, Turn, Stop and Reverse. The 3rd currently can't work due to the cable being cut. However, all the sudden my front lights stop working at all and it seems like I forgot to pull the ground wire. I have 3 wires high, low and park. No ground. I pulled temporarily a ground to the front lights and now they are working again. My front lights don't have a parking lamp so this cable is not used in my goblin, but the wire has voltage when park lamps are on. To be sure I pulled the high and low beam fuses and confirmed that the front lights are connected correctly.
Well the story continues. All the functions, park, turn, brake, hi and low beam are working. But when the car is off the park wire has 8V again.... Furthermore when I turn on the turn signal, the little park LED in the turn signal goes off when the turn signal goes on. They are blinking opposite. Well, I thought maybe not a good ground at the turn signal and pulled another temp ground, but no change.
For some odd reason the Park fuse now has 8V on both sides. I wonder if the Park Relay on the PCB board is damaged. The manual says it's not serviceable, but I don't believe that
Has someone done that? Or any better idea where this 8v could come from? If I pull the park fuse, the park lights in the mirrow and front are not working as expected. But also the running lights on the rear lights are not working. I wonder if I should just pull another cable and put the rear running lamps parallel to the front lights.
Anyone any good ideas what to check now?
I first thought the problem with the 8V came from here, but now I find out that the 8V seems to come from the park light.
