jcb JS300 Service Manual page 561

Wires and Connectors
K Fig 15. ( T C-138)
Upper/Main Wiper Switch and Motor
24V connects to the upper wiper switch (C116) via fuses
26 and 3 in the main fuse board (C100 X4).
The upper wiper switch has three positions:
– Position 1 - is the ON position for intermittent wiper
– Position 2 - is the ON position for continuous wiper
– Position 3 - is the OFF position.
To energise the washer and wiper relay (R3) and so supply
the wipers/washer with power the upper screen must be
closed. Fuse 3 supplies 24V to the upper screen micro
switch (C142).
When the screen is closed the contacts on the switch
(C142) close. Power connects to the wash/wipe relay (R3),
closing the contacts and connecting power via fuse 26 to
the wash/wipe circuit.
Fuse 26 connects power via the relay and wire 8100 to the
lower wiper switch, screen wash switch, upper wiper motor
and main wiper switch.
Intermittent wipe - When the switch (C116) is set to
intermittent, 24V connects via wire 8007 to the wiper motor
park/intermittent controller A at pin 1(C058). The controller
connects power from wire 8100A at pin3 through its
contact to pin 2 and wire 8009 to the wiper switch at pin 4
(C116). The switch connects power to pin 5 and to the
wiper motor, via wire 8006, the wiper motor operates. The
park/intermittent controller will control the delay between
each wipe by opening and closing its internal contact.
Continuous wipe - for continuous wipe, 24V connects to
the wiper motor at pin 5 (C058) via wire 8100D from pin 6
pin 5 wire 8006 direct to the wiper motor bypassing the
Park/Intermittent controller. When the wiper switch is set to
OFF, power is restored from pin 4 to pin 5 of the switch until
the park position is achieved which opens the internal
contact between pins 3 and 2 of the wiper motor.
C-136
C116
Fig 12. Harness connectors
Lower Wiper Switch and Motor
24V is supplied to the lower wiper switch (C118) via fuses
26 and 3 in the main fuse board (C100 X3).
The lower wiper switch has two positions:
– Position 1 - is the OFF position
– Position 2 - is the ON position for wipers
When the lower wiper switch is set to ON, a 24V supply
from pin 2 of the switch energises the lower wiper motor
(C125) via wire 8033 at pin 3.
When the switch is set to OFF and the wiper arm is not in
the park position the wiper motor operates until the park
position is achieved. The wiper motor assembly has a
switch B connected to the motor cam that opens when the
park position is reached.
When the wiper motor is not in the park position the switch
B contacts are closed, allowing the 24V from pin 2 to
connect to pin 1 of the wiper motor. Power is connected to
pin 1 at the lower wiper switch (C118) via wire 8034. When
the switch is set to OFF the switch contacts connect from
pin 1 to 2 and the wiper motor continues to operate until the
park position is achieved.
9813/5100-1
Section C - Electrics
Cab Systems and Lighting
Wipers and Washers
C058 C142-1,
C142-2
C129480-C6.eps
C-136