Thank you Mickster,
you are quite right, scarce for this IC. The information you sent I knew already, with every link.
To give still another idea: it was used in the years end 80est by VDO-Swiss, for even this door-locking device. I have a lot of difficulty to accept that this IC was used only by VDO, even if it possible that it was made custom taylored. If so, why there are still such a lot of units in the market? BTW, my IC was made by Philips but nothing to find on the site of Philips.
Hopefully that a "know-all" will help me still.