After checking every single wire and finding some important differences compared to the closest wiring diagram, “Schaltplan der Klimaanlage (ab Modell 73)”, I suspect that some variations apply to the well-known ’73 ½ and later models.
Yesterday, we had a video call with
@alprada70 , during which we identified and clarified several points. I’d like to document everything here so that if someone runs into the same situation, this information can be helpful.
First, I am using this wiring diagram along with the translation that
@sfdon kindly shared with me, which has been extremely helpful. One important clarification: when the car is equipped with A/C, there are additional wiring harnesses (at least in my case).
I’m attaching a photo of these harnesses for documentation purposes:
One internal harness, shown in one of the photos.
A second external harness, which is already integrated into the taped main harness.
The internal harness connects to connectors 12 and 15 in the diagram. Part of the confusion initially came from not realizing that these connectors are 3-wire connectors. Once that became clear, it was easier to understand the wiring path between the Temperature Control Switch (#22) (black wire) and connector #21, where another black wire comes from the diode (#20).
That diode was unfortunately lost or removed by mistake during disassembly, likely because we assumed it was uncommon to have only black wires in the harness. We later had to restore it and add it back correctly.
As I had mentioned before, regarding #6 (the fuse box): in my car, the GN-BR wires go to fuse #10, not fuse #4 as shown in the diagram. This is another difference worth noting for anyone using this schematic as a reference.
After all these findings, I’m also attaching a photo showing the A/C blower. Underneath it, there appear to be two connectors. Could this be device #17 (resistor) in the diagram? I’d appreciate it if someone could confirm this.
Thanks in advance, and I hope this helps others working through similar wiring issues.
