ON AUGUST 23, 1999, VOLVO NOTIFIED NHTSA THAT IT WOULD CONDUCT A SAFETY RECALL (99V235) ON CERTAIN 1997 MODEL YEAR (MY) 850 VEHICLES AND CERTAIN 1998 S/V/C 70 SERIES VEHICLES FOR FAILURE OF THE HEADLIGHT SWITCH.THE DEFECT REPORT STATED IN PART: OPERATION OF THE HEADLIGHT SWITCH, OVER AN EXTENDED PERIOD OF TIME, CAN RESULT IN INCONSISTENT OPERATION OF THE SWITCH.VOLVO'S REMEDY FOR THIS RECALL WAS TO REPLACE THE HEADLIGHT SWITCH.THIS RECALL QUERY INVESTIGATION WAS OPENED ON JUNE 8, 2004, BASED ON 13 REPORTS OF HEADLIGHT FAILURE ON 1998 AND 1999 S/V/C 70 SERIES VEHICLES THAT WERE NOT INCLUDED IN THE EARLIER RECALL.BY LETTER OF OCTOBER 18, 2004, VOLVO HAS NOTIFIED THE AGENCY THAT IT WILL NOW CONDUCT A SAFETY RECALL OF AN ADDITIONAL 97,000 MY 1998 THROUGH 2000 S70/V70/V70XC AND C70 VEHICLES BUILT FROM JUNE 5, 1997 THROUGH JANUARY 11, 2000. VOLVO DEALERS WILL REPLACE THE ORIGINAL EQUIPMENT MASTER LIGHT SWITCH WITH ONE OF AN IMPROVED DESIGN. SEE SAFETY RECALL 04V504 FOR DETAILS.