Airbag diagnostic socket - Yes where is it

Hello us nice day V8 enthusiast, my airbag light has been burning since season start. I wanted to read out the bug memory. But unfortunately I can't find a diagnostic book. Punishable but true, which is a V8 Bj 89. Therefore, my question is whether I can read it at all ¿ I know that the later models have the jack in the passenger footroom, which can also be without function by a recall action. Then you have to read out directly on the control unit. The control unit I have also been able to expose via the driver's footroom panel, but I find nothing appropriate there. Or is a special diagnostic device needed? How's it going with the bj. 89. somehow this must be set back after all ? The vehicle is a 3.6-year-old. 89 about 226500 km. Please excuse the formatting of the text, this was unfortunately written with a tray which resists a bit. Greetings Jens Peschel