Workman HDX Auto Page 6 − 15 Electrical System
Parking Brake Switch
The parking brake switch is a normally closed proximity
switch that is attached to the control lever support (Fig.
16). The switch is in its normal closed position when the
parking brake is applied. When the parking brake is not
applied, the parking brake lever is positioned close to the
brake switch causing the switch to open. The closed
brake switch is used in the starting interlock system to
make sure that the drive system is disengaged during
engine starting.
NOTE: When the parking brake is applied, the rear dif-
ferential relay is energized which opens the circuit to the
rear differential locking solenoid. The de−energized so-
lenoid locks the rear differential while the vehicle is sta-
tionary with the parking brake applied.
Testing
1. Park vehicle on a level surface, shut engine off, re-
move key from ignition switch and apply parking brake.
Locate the parking brake switch (Fig. 16).
2. Remove seat base to gain access to parking brake
switch (see Seat Base in the Service and Repairs sec-
tion of Chapter 5 − Chassis).
3. Disconnect the wire harness connector from the
parking brake switch.
4. With the use of a multimeter (ohms setting), test for
continuity across the two (2) switch terminals. There
should be continuity (zero ohms) when the parking
brake is applied and there should not be continuity (infi-
nite ohms) when the parking brake is released.
5. Replace parking brake switch if testing proves it to be
faulty.
6. After switch testing is completed, connect the wire
harness connector to the parking brake switch.
7. Install seat base to machine (see Seat Base in the
Service and Repairs section of Chapter 5 − Chassis).
Figure 16
1. Parking brake lever
2. Parking brake switch
3. Screw (2)
1
2
3
FRONT
Electrical
System
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