Sorry in advance for resurrecting an old thread.
I had an issue related to this on the highway today but I need some guidance. I was cruising at ~60 mph (night time, 6:30pm) and all of the interior lights in the cabin came on at once and my tachometer and speedometer needles dropped to zero while I was still moving. The DIC said “Service Air Bag” briefly but it went away after a split second. The airbag light came on but disappeared just as fast as the DIC message. The engine went dead as did the entire center stack, no hazards, turn signals (from what I could tell), brake lights, radio shut off.
At the time I had my backpack on the seat which has my laptop, key fob, headphones, etc. in it. It’s heavy enough to trip the weight sensor to activate the passenger airbag. I managed to get over to the shoulder and the center stack came back on, hazards worked, engine started, seemingly back to normal.
I drove home no problem and did another test drive with no problems either. Could this be related to the airbag module? I’m really at a loss here.
This happened once before in my 2005 CTS, whole interior electronics turned off. No lights on dash, needles dropped to 0 but engine kept running and I drove home without a hitch. That happened almost 6 years ago and it has never happened again. Im wondering if it’s just a fluke?