Wife just home with all DWD's symptoms. Found both battery terminals with very heavy buildup of "white" powder. Same cleaned and after alarm reset all working well. Also had Engine light (yellow) illuminated. Now need to get SRS light cleared. Thanks jimmy57 for info. Regards Hans Johannes...

Had the same on my xc70 awd and was told by Volvo dealer to diconnect the battery to clear all codes. Apparently when you brake hard (what happened to me ) the system "starts to arm" for a potential accident.
My code has not come back again. Regards Hans