TestingtheParkingBrakeSwitch(continued)
3.IftheSCMveriîš¿esthatthesensorandcircuitwiringarefunctioningcorrectly,
thennomoreswitchtestingisnecessary.
4.IftheSCMdeterminesthattheparkingbrakeswitchandcircuitwiringarenot
functioningcorrectly,proceedwiththetest.
5.Removetheknobfromtheparkingbrakerodandthescrewsfromthe
steeringtowercover(Figure149).
6.Slidethesteeringtowercoverupthesteeringcolumn.
7.Locatetheparkingbrakeswitch(Figure150).
Note:Ensurethattheparkingbrakeisnotset.
8.Disconnecttheswitchconnectorfromthemachinewireharness.
9.Connectamultimeter(ohmssetting)acrosstheswitchconnectorterminals
tocheckthecontinuityoftheswitchasfollows:
A.Whentheswitchplungerisextended,thereshouldnotbecontinuity
betweentheswitchterminals.
B.Whentheswitchplungerispressed,thereshouldbecontinuitybetween
theswitchterminals.
10.Replacetheswitchiftestingdeterminesthattheswitchisdamaged.
11.Iftheparkingbrakeswitchtestingiscorrectandacircuitproblemstillexists,
checkthemainwireharness;refertotheElectricalSchematicsandWire
HarnessDrawings/DiagramsinAppendixA(pageA–1).
12.Afteryoucompletetheparkingbrakeswitchtesting,connecttheswitch
connectortothemachinewireharness.
13.Installthesteeringtowercoverandparkingbrakeknob.
Groundsmaster
®
3280-D/3320
Page6–51
ElectricalSystem:TestingtheElectricalComponents
05138SLRevB
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