Parking Brake Switch
Theswitchusedfortheparkingbrakeisanormally open
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 parking brake pawl is positioned away from
the switch plunger so the switch is in its normal, open
state.
Testing
1.
Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a TEC--5002 input with the Diagnostic Display (see
Diagnostic DisplayintheTroubleshootingsectionofthis
chapter). If the Diagnostic Display verifies that the park-
ing brake switch and circuit wiring are functioning cor-
rectly,nofurtherswitchtestingisnecessary.If,however,
the Display determines that the brake switch and circuit
wiring are not functioning correctly, proceed with test.
1
3
2
2.
Make sure ignition switch is OFF. Remove key from
ignition switch.
Figure 32
3.
Locateparkingbrakeswitch fortesting (seeSteering
Tower Disassembly in the Service and Repairs section
of Chapter 7 -- Chassis).
1.
2.
Parking brake switch
Parking brake rod
3.
Parking brake pawl
4.
Disconnect wire harness connector from the brake
switch.
5.
multimeter (ohms setting) across the connector termi-
nals.
Check the continuity of the switch by connecting a
6.
should not be continuity between the switch terminals.
When the brake switch plunger is extended there
7.
should be continuity between the switch terminals.
When the brake switch plunger is depressed, there
8.
After testing, connect wire harness connector to
parking brake switch.
9.
(see Steering Tower Assembly in the Service and Re-
pairs section of Chapter 7 -- Chassis).
Secure all removed components to steering tower
Groundsmaster 4000--D/4010--D
Page 5 -- 29
Electrical System
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