Troubleshooting ABS

Hello, I have a question regarding the troubleshooting of the ABS. My Audi V8 3.6L BJ91 has been standing for the last 8 years, I'm just getting him out on the road again.

At one of the regular engine starts, the battery was accidentally connected to the polarized grid for a fraction of a second. I'm not 100% sure, but since this incident, I think my ABS lamp has been lit and I can't turn it off via the switch either.

I bought a tested ABS control unit and I already installed it without any improvement.
With the VAG Com I read out the transmission control grotto, because according to my research, there at least the speed sensors should be reported in case of errors, all i.o.

I now have no choice but to carry out measurements based on the circuit diagrams.

Now to my problem. According to the RLF's circuit diagrams, at least for vehicles from August 1991 (my EZL 09/91) the combined relay for ABS J156 should be on slot 2.

With me this place is empty, I can't remember having consciously removed the relay and if I had, I would have put it in the Audi. Well, eight years is a long time, but I'm getting a bit of a fuss about this.

I would therefore like to ask if another owner can see a 91 V8 time, if this relay is occupied and if necessary can also give me the part number of the relay?

Thank you for your help.