EA04035 · EA
EXTERIOR LIGHTING:TURN SIGNAL Investigation
THE COMBINATION FRONT TURN SIGNAL/DRL IN MY 2003 SATURN ION COUPES EXPERIENCED SIGNIFICANT EARLY-LIFE FAILURES DUE TO VARIOUS BULB QUALITY ISSUES DUE TO INADEQUATE DESIGN AND MANUFACTURE.THIS PROBLEM TREND APPEARS TO HAVE DISAPPEARED AFTER THE FALL OF 2003.THE CHANGE OF LEAD WIRE MATERIAL NEAR THE START OF MY 2004 VEHICLE PRODUCTION APPEARS TO HAVE REDUCED THE FAILURE RATE FOR MY 2004 SATURN ION COUPES.ALTHOUGH OPERATING TEMPERATURES IN THE SUBJECT VEHICLES' LAMP ASSEMBLIES ARE BELOW THE SOCKET MATERIAL MAXIMUM TEMPERATURE SPECIFICATION, THEY ARE ONLY SLIGHTLY BELOW THE SPECIFICATION.IN DECEMBER 2004, GM REDUCED THE VOLTAGE TO THE LAMP ASSEMBLY IN ORDER TO REDUCE THE TEMPERATURE IN THE ASSEMBLY OF THE SUBJECT VEHICLES.WARRANTY CLAIMS ON THE SUBJECT VEHICLES DO NOT INDICATE AN INCREASING TREND OVER TIME.WARRANTY CLAIM RATE OF SUBJECT VEHICLES (EXCLUDING EARLY MY 2003 CLAIMS) IS NOT SIGNIFICANTLY HIGHER THAN OTHER GM VEHICLES THAT USE COMBINATION TURN SIGNAL/DRLS.A SAFETY-RELATED DEFECT TREND HAS NOT BEEN IDENTIFIED AT THIS TIME.FURTHER USE OF AGENCY RESOURCES DOES NOT APPEAR TO BE WARRANTED.ACCORDINGLY, THIS INVESTIGATION IS CLOSED.THE CLOSING OF THIS INVESTIGATION DOES NOT CONSTITUTE A FINDING BY NHTSA THAT A SAFETY-RELATED DEFECT DOES NOT EXIST.THE AGENCY WILL TAKE FURTHER ACTION IF WARRANTED BY THE CIRCUMSTANCES.SEE ATTACHED SUMMARY REPORT.
PE04061 · PE
EXTERIOR LIGHTING:TURN SIGNAL Investigation
ON NOVEMBER 16, 2004, GM NOTIFIED NHTSA THAT IT WILL CONDUCT A SAFETY RECALL OF 178,798 MODEL YEAR (MY) 2003 AND 2004 SATURN ION SEDAN VEHICLES FOR INOPERATIVE FRONT TURN SIGNAL/DRL BULBS.GM STATED THAT TEMPERATURES IN THE LAMP ASSEMBLY EXCEED THE MATERIAL SPECIFICATION FOR THE BULB SOCKETS AND BULB BASE SLEEVES, WHICH CAUSE DEFORMATION.THE DEFORMED SOCKETS CAN CAUSE LOSS OF BULB AND SOCKET CONTACT.THE DEFORMED SLEEVES CAN CAUSE STRESS CRACKS TO FORM ON THE BULB THAT CAN LEAD TO PREMATURE BULB FAILURE.THE RECALL REMEDY IS TO REPLACE THE FRONT TURN SIGNAL/DRL BULBS AND INSPECT FOR VOLTAGE-REDUCING JUMPER (WHICH REDUCES TEMPERATURE IN LAMP ASSEMBLY) AND ADD IF NOT PRESENT.SEE NHTSA RECALL NO. 04V547 FOR DETAILS.THE BULBS FOR THE TURN SIGNAL/DRL IN THE SATURN ION SEDAN AND ION COUPE ARE IDENTICAL IN DESIGN AND MADE BY THE SAME SUPPLIER.BUT THE TURN SIGNAL/DRL SOCKETS, WIRING AND HOUSING ARE DIFFERENT IN DESIGN FOR THE SEDAN AND COUPE, AND WERE MADE BY DIFFERENT SUPPLIERS.GM'S DATA SHOWS A LOWER OPERATING TEMPERATURE FOR THE COUPE'S LAMP ASSEMBLY THAT DOES NOT EXCEED THE MATERIAL SPECIFICATION FOR THE BULB SOCKET AND THE BULB BASE SLEEVE.COMPLAINT AND WARRANTY RATE IS ALSO LOWER FOR THE COUPE.HOWEVER, GM'S WARRANTY DATA SHOWS A CONTINUING TREND FOR THE COUPE.THIS PRELIMINARY EVALUATION HAS BEEN UPGRADED TO AN ENGINEERING ANALYSIS (EA04-035) FOR FURTHER INVESTIGATION OF THE MY 2003 AND 2004 SATURN ION COUPE VEHICLES.