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1、WelcomeToLightingSystemOperation&DiagnosisSECTION10ObjectivesExplaintheoperatingprinciplesofthevariouslightingsystems.Describethedifferenttypesofheadlightsandhowtheyarecontrolled.Replaceheadlightsandotherburnedoutbulbs.Explainhowtoaimheadlights.continued…ObjectivesUnderstandthefunctionsofturn,sto
2、p,andhazardwarninglights.Knowhowback-uplightsoperate.Explainthepurposeofauxiliaryautomotivelighting.Describetheoperationandconstructionofthevariousautomotivelamps.Diagnoselightingproblems.LightingPurposesThevariouslightingsystemsallowforsaferdrivingconditionsduringdaytimeandnightdriving.Somelight
3、ingsystemsareessentialfordrivingsuchas;headlights,parkinglights,markerlights,taillights,turnsignal,hazardwarning,backup,andstoplights.Otherlightingsystemsofferconveniencetothedriverandpassengerssuchas;thecourtesylights,dome/maplights,instrumentilluminationordashlights,coachlights,vanitymirrorligh
4、ts,underhoodlight,gloveboxlight,andthetrunkcompartmentorcargolights.TypesofHeadlightsStandardsealedbeamIsaself-containedandair-tightassemblywithafilament,reflector,andlensfusedtogether.Theparabolicreflectorintensifiesthelightproducedbythefilament,andthelensdirectsthelighttoformtherequiredlightbea
5、mpattern.Thelightfromthereflectorispassedthroughconcaveprismsintheglasslens.continued…TypesofHeadlightsHalogensealedbeamWiththehalogenaddedtotheinnerbulb,thetungstenfilamentiscapableofwithstandinghighertemperaturesthanthatofstandardsealed-beamlights.Sinceitcanwithstandhighertemperatures,itcanburn
6、brighter.Providesabout25%morelightingpowerthanconventionalbulbs.TypesofHeadlightsAtypicalhalogensealedbeamheadlamp.TypesofHeadlightsCompositeToday’scarsusehalogenheadlightsystemsthatuseareplaceablebulb.Allowsthemanufacturertoproduceanystyleofheadlightlenstheydesiretoimprovetheaerodynamics,fueleco
7、nomy,andstylingofthevehicle.TypesofHeadlightsAtypicalcompositeheadlampassemblyTypesofHeadlightsHighintensitydischarge(HID)HIDorxenonheadlightsareelectronicallycontrolledgas-dischargelights.Anelectricalarciscreatedbetwe