NHTSA Engineering Analysis EA02012

THE SUBJECT VEHICLE'S AIR BAG ELECTRONIC CONTROL MODULE CONTAINS PROGRAMMABLE LOGIC FOR DEPLOYING THE SIDE-IMPACT AIR BAGS.BMW REVISED THE MODULE SEVERAL TIMES OVER THE SPAN OF THE MODEL YEARS 1999 THROUGH 2002 (IDENTIFIED AS MRS2.CA, MRS2.BB, MRS3, MRS3+ AND MRS4).ALTHOUGH MODEL YEAR 1999.5 VEHICLES WITH VERSION MRS2.BB HAD 6.5% OF THE SUBJECT POPULATION, IT ACCOUNTED FOR 29% OF THE TOTAL REPORTS RECEIVED.THE MRS2.BB EXPOSURE ADJUSTED REPORT RATE WAS ALMOST 4 TIMES HIGHER THAN OTHER 3 SERIES AIR BAG MODULE VERSIONS.IN AUGUST 2002, BMW INITIATED A RECALL CAMPAIGN FOR 20,500 MODEL 323I AND 328I VEHICLES WITH VERSION MRS2.BB (NHTSA RECALL # 02V223000).IN ADDITION TO EXPERIENCING A LOWER RATE OF NON-CRASH DEPLOYMENTS, MOST OF THE NON-RECALLED VEHICLES ALSO SHOWED EVIDENCE OF SIGNIFICANT POTHOLE/CURB IMPACT WITH SOME HAVING ADDITIONAL UNDERCARRIAGE CONTACT/SCRAPE OR SUSPENSION DAMAGE.SEE ADDITIONAL INFORMATION