Parking Brake Switch
Theswitchusedfortheparkingbrakeisanormally open
switch that is located under the steering tower cover
(Fig. 33). 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). Ifthe Diagnostic Display verifies thatthebrake
switch andcircuit wiring arefunctioning correctly,nofur-
ther switch testing is necessary. If, however, the Display
determines that the brake switch and circuit wiring are
not functioning correctly, proceed with test.
1
3
2.
Make sure ignition switch is OFF. Remove key from
2
ignition switch.
Figure 33
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.
Steering Tower Assembly in the Service and Repairs
section of Chapter 7 -- Chassis).
Secure all removed steering tower components (see
Groundsmaster 4100--D/4110--D
Page 5 -- 29
Electrical System
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