Parking Brake Switch - Toro Groundsmaster 4100-D Service Manual

Parking Brake Switch

The switch used for the parking brake is a normally open
switch that is located under the steering tower cover
(Fig. 33). The brake switch is used as an input for the
TEC--5002 controller. When the parking brake is not ap-
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 Display in the Troubleshooting section of this
chapter). If the Diagnostic Display verifies that the brake
switch and circuit wiring are functioning correctly, no fur-
ther switch testing is necessary. If, however, the Display
determines that the brake switch and circuit wiring are
not functioning correctly, proceed with test.
2. Make sure ignition switch is OFF. Remove key from
ignition switch.
3. Locate parking brake switch for testing (see Steering
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 steering tower components (see
Steering Tower Assembly in the Service and Repairs
section of Chapter 7 -- Chassis).
Groundsmaster 4100--D/4110--D
1
3
1. Parking brake switch
2. Parking brake rod
Page 5 - - 29
2
Figure 33
3. Parking brake pawl
Electrical System