Parking Brake Switch
The parking brake switch is a normally open proximity
switch. The parking brake switch is attached to the bot-
tom of the brake pedal (Fig. 32). The parking brake
switch is used as an input for the TEC controller.
D. Turn ignition switch to the ON position (do not
start engine) and verify with a multimeter that ma-
chine wire harness connector terminal for pink wire
has system voltage (12 VDC) present.
Whentheparkingbrakeisnotapplied,theparkingbrake
detent is positioned near the target end of the parking
brake switch so the switch is closed. The parking brake
detent is moved away from the switch when the parking
brake is applied causing the switch to open.
E. If black wire is closed to ground, pink wire has
system voltage present and switch LED did not func-
tion, replace parking brake switch. Adjust switch af-
ter installation (see Parking Brake Switch in the
Adjustments section of this chapter).
Testing
5. If the parking brake switch tests correctly and a cir-
cuit problem still exists, check wire harness (see Electri-
cal Schematic and Circuit Drawings in Chapter 8 --
Foldout Drawings).
1.
Before disconnecting the parking brake switch for
testing, the switch and its circuit wiring should be tested
as a TEC controller input with the Diagnostic Display
(see Diagnostic Display in the Troubleshooting section
ofthischapter).IftheDiagnostic Displayverifies thatthe
parking brake switch and circuit wiring are functioning
correctly, no further switch testing is necessary. If, how-
ever,theDiagnostic Displaydetermines thattheparking
brake switch and circuit wiring are not functioning cor-
rectly, proceed with testing procedure.
6. Make sure that parking brake switch is connected to
wire harness when testing is complete.
2.
Turn ignition switch to the ON position (do not start
engine) and check LED on cable end of brake switch
(Fig. 32). LED should be illuminated when the parking
brake is not applied.
5
3.
With the ignition switch still in the ON position (do not
start engine), apply parking brake and check LED on
cable end of parking brake switch. LED should not be
illuminated when the parking brake is applied.
3
4.
If the brake switch LED did not function correctly:
2
4
A. Make sure that brake switch is properly adjusted
(see Parking Brake Switch in the Adjustments sec-
tion of this chapter). If necessary, adjust switch and
return to step 2 above.
3
1
B. Make sure ignition switch is OFF and disconnect
the parking brake switch connector from the ma-
chine wire harness.
6
Figure 32
C. Verify that the machine wire harness connector
terminal for black wire is closed (continuity) to
ground.
1.
2.
3.
Parking brake switch
Lock washer (2 used)
Jam nut (2 used)
4.
5.
6.
Parking brake detent
Brake pedal
Switch LED location
Electrical System
Page 5 -- 30
Groundsmaster 4300--D
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