282 VEHICLE CARERelays Usage50 Child door locksecurity51 Rear closure52 Rear closure 254 Door lock security56 Fuel doorWheels and TiresTiresEvery new GM vehicle hashigh-quality tires made by aleading tire manufacturer. See thewarranty manual for informationregarding the tire warranty andwhere to get service. Foradditional information refer to thetire manufacturer.{ Warning. Poorly maintained andimproperly used tires aredangerous.. Overloading the tires cancause overheating as aresult of too much flexing.There could be a blowoutand a serious crash. SeeVehicle Load Limits 0 183.(Continued)Warning (Continued). Underinflated tires posethe same danger asoverloaded tires. Theresulting crash could causeserious injury. Check alltires frequently tomaintain therecommended pressure.Tire pressure should bechecked when the tiresare cold.. Overinflated tires are morelikely to be cut, punctured,or broken by a suddenimpact — such as whenhitting a pothole. Keeptires at the recommendedpressure.. Worn or old tires cancause a crash. If the treadis badly worn,replace them.(Continued)