One problem related to headlight switch has been reported for the 2000 Chevrolet Blazer. The most recently reported issues are listed below.
While driving at night, headlights will flash on and off. This happens intermittently. Dealer contacted. Consumer states the shift indicator light and information console light go on and off or do not respond, daylight running lights switch from night to daytime mode at anytime, the headlight switch was replaced along with the sensor for the daylight running lights and consumer has not had any problems as of yet.