1998 S420 W140,BAS/ESP and occasional stall

[92300SE]

On my old S420/1998,the BAS/ESP light will come on and stay on at start up.The problem is that the car will stall while waiting at the light,or lose and regain power on occasion.I don't know what relay is responsible for the BAS,the heater blower is dead,that might be related if those two are wired thru the same k30 relay or fuse?I thought about the brake light switch,however,the W140's don't really have that problem...