Groundsmaster 4000--D/4010--D Page 5 -- 29 Electrical System
Parking Brake Switch
Theswitchusedfortheparkingbrakeisanormallyopen
switch that is located under the steering tower cover
(Fig. 32). The brake switch is used as an input for the
TEC--5002controller.Whentheparkingbrakeisnotap-
plied, the parking brake pawl depresses the switch
plunger to close the switch. When the parking brake is
applied,the parkingbrake pawlispositioned awayfrom
the switch plunger so the switch is in its normal, open
state.
Testing
1. Before disconnecting the parking brake switch for
testing,theswitch and itscircuit wiringshouldbetested
as a TEC--5002 input with the Diagnostic Display (see
DiagnosticDisplayintheTroubleshootingsectionofthis
chapter).IftheDiagnostic Display verifiesthatthe park-
ing brake switch and circuit wiring are functioning cor-
rectly,nofurtherswitchtestingisnecessary.If,however,
theDisplay determines that the brake switch andcircuit
wiring are not functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Locateparkingbrakeswitchfortesting( seeSteering
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis).
4. Disconnect wire harness connector from the brake
switch.
5. Check the continuity of the switch by connecting a
multimeter (ohms setting) across the connector termi-
nals.
6. When the brake switch plunger is extended there
should not be continuity between the switch terminals.
7. When the brake switch plunger is depressed, there
should be continuity between the switch terminals.
8. After testing, connect wire harness connector to
parking brake switch.
9. Secure all removed components to steering tower
(see Steering Tower Assembly in the Service and Re-
pairs section of Chapter 7 -- Chassis).
1. Parking brake switch
2. Parking brake rod
3. Parking brake pawl
Figure 32
1
3
2
Electrical
System
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