Frage, PDC v/h und e-sitze/heizung funktioniert nicht?

check the fuses in the engine bay

Possibly somewhere one or more cables defective

Zitat von ACE1

put a testlamp on the poles of FB1

What do you mean by that? Did you check the two poles with pulled fuse against mass? Of course, one of them has to offer 12 volts.

Zitat von ACE1

tried some other poles near FB1

Does that mean you have FB3, FB4, FB5 and FB7 in the rear Box checked ? However, test them with the method as described (-> "poles with pulled fuse against mass")

Zitat von ACE1

test lamp on the fusepoles...against mass !

Do it with the place of the F 20 in the Engine Box.

Another Question:
As you can see in the two pictures there are a lot of DTC codes. What are there for additional comments: "DTC available at the time of the request" or "...not available at the time of the request"?

FB1, and alle other fuses in rear junction box are switched by a relay placed there, too (4BR02). Ask someone to switch ignition, while putting your ear on the relay. Do you hear it "clicking"? Again you can pull this out and check any pin for 12V. There should be at least one pin should have 12V if ignition is off. This pin comes directly from engine fusebox F20 (60A). If you can't measure it on the relay socket, we can continue search in your engine bay

You did measure in rear fuse box? Check relay.

Well, thats good. The left one is relay RB1, which is the one in question to give power to all fuses in this section.
So if it "clicks" it seems(!) to work. But you have to mease power to be shure its closer contacts are okay!
When you pull it out with ignition off, one of its (5?) pins should carry +12V. If you find only one, it's pin 3. You can cross-check by pulling Fuse F20 from engine fusebox.

Near the battery there are some big main fuses, not described in the manuals.
Ich have no wiring plan, but I think there are some of these.

Zitat von gobang

there are some big main fuses, not described in the manuals.

Du meinst die hier? (Seitlich unter der schwarzen Abdeckung versteckt, F3 bis F5 und F16 bis F21, rot umrahmt) Doch die stehen drin in der BA.

Zitat von ACE1

i did check F17 - F21, all fine..

You mean this Fuses here in the Engine Box? (marked red, hidden under the black cover)

Zitat von ACE1

the big one makes click when pulled in/out with ignition on. the small one does not

[Blockierte Grafik: https://imageshack.com/a/img922/8236/HS6Vu8.jpg]

Zitat von Go4IT

Well, thats good. The left one is relay RB1, which is the one in question to give power to all fuses in this section.
So if it "clicks" it seems(!) to work. But you have to mease power to be shure its closer contacts are okay!
When you pull it out with ignition off, one of its (5?) pins should carry +12V. If you find only one, it's pin 3. You can cross-check by pulling Fuse F20 from engine fusebox.

@Go4IT
Das Ding hat 4 Pole, ist bloß ein einfaches Standard-Schaltrelais

Zitat von Dermon4

Du meinst die hier? (Seitlich unter der schwarzen Abdeckung versteckt, F3 bis F5 und F16 bis F21, rot umrahmt) Doch die stehen drin in der BA.

Ja, diese - stehen also doch in der BA.
Sind also auch alle OK.

Denke, ohne Stromlaufplan kommt ACE1 da nicht weiter.

And did you test the RB1 relay outside as stand alone?

Yes, as i said, its a simple „closer“.
If its not labeled, check for coil using Ohmmeter and give power to it to measure ON-restistance if closer contacts. Maybe you could remove the plastic cover to look inside...