Space Star SRS lamp lights – Airbag Error memory cannot be deleted

Hello, with my Space Star 1.8 GDI Built. 2000 the SRS lamp has been lit for a long time. Was already in the workshop and there was an error stored in the airbag control unit, however, it could not be deleted. Had last year due to defective alternator overvoltage and therefore suspect that the STG is defective. Or would it not be possible to read out the error memory if it was defective due to overvoltage? Would you also like to see a circuit diagram from the airbag so that I can also see the Lei MfG edition-driver