AIRBAG WARNING LAMP ILLUMINATED This Service Information bulletin Replaces SI B65 18 16 dated July 2016.. The airbag warning lamp in the instrument cluster lights up while the vehicle is in motion. The airbag control unit (ACSM4) contains the following fault(s): 930904 - Drivers airbag interval stage 1, resistance too high 93090A - Drivers airbag interval stage 2, resistance too high Tension caused by harness cable tie on short jumper harness located between steering column slip ring and driver's airbag creates excess resistance.