Dodge RAM TRUCK 1500 1995 Service Manual page 704

B R
8W-53 WIPERS 8W - 53 - 1
WIPERS
WIPERS
Fuse 8 in the fuse block powers the intermittent
wiper system. The intermittent wiper system oper­
ates at either DELAY, LOW or HIGH speeds.
In the ACCESSORY or RUN position, the ignition
switch connects circuit Al from fuse 3, a 40 amp, in
the Power Distribution Center (PDC) with circuit
A31. Circuit A31 supplies voltage to circuit V6
through fuse 10 in the fuse block.
Circuit ¥6 splices to supply power to the wiper
switch circuitry in the multi-function switch, the in­
termittent wiper module and the park switch in the
wiper motor. Ground for the wiper motor is supplied
on circuit Zl. Circuit Z3 provides ground for the in­
termittent wiper control module.
When the operator moves the wiper switch to the
LOW speed position, the switch passes voltage to cir­
cuit V3. Circuit V3 feeds the wiper motor LOW speed
brushes. If the operator selects wiper HIGH speed
operation, the wiper switch passes current to circuit
V4. Circuit V4 feeds the wiper motor HIGH speed
brushes.
If the operator selects wiper DELAY operation, the
wiper switch provides an input to the intermittent
wiper control module on circuit V9. The DELAY por­
tion of the wiper switch contains a variable resistor.
The variable resistor connects to the intermittent
wiper module on circuit V9. Voltage for the resistor is
supplied by circuit V6 through the wiper switch. The
amount of delay selected by the operator determines
the voltage drop through the resistor and the voltage
level received by the intermittent wiper module.
After the intermittent wiper control module deter­
mines the amount of delay selected, it cycles the wip­
ers by periodically energizing circuit VI7 which
connects to circuit V3 through the wiper switch. Cir­
cuit V3 powers the wiper motor LOW speed brushes.
As the windshield wiper motor turns, the park
switch, internal to the motor, moves from its
grounded position (down) to the powered RUN (up)
position. Circuit V7 provides an input to the inter­
mittent wiper control module when the wiper switch
is in the OFF position. The intermittent wiper con­
trol module powers the park switch in the wiper mo­
tor on circuit V5.
The intermittent windshield wiper system is also
equipped with a pulse wipe feature. To activate this
feature, the operator presses the washer switch mo­
mentarily. When the washer switch closes, voltage
from circuit V6 passes through the switch to circuit
V10. Circuit V10 provides a signal to the intermit­
tent wiper control module and supplies voltage for
the windshield washer pump. When the control mod­
ule receives the signal on circuit V10, it cycles the
wipers on circuit V3 while the washer fluid pump op­
erates.
The washer motor operates whenever the washer
switch CLOSES and supplies voltage to it on circuit
V10. Circuit Zl provides ground for the pump motor.
HELPFUL INFORMATION
• Circuit V3 is double crimped at the multi-function
switch to allow either the wiper switch or intermit­
tent wiper control module to power the wiper motor
LOW speed brushes
• Check the 40 amp fuse located in cavity 3 of the
PDC
• Check the 20 amp fuse located in cavity 8 of the
fuse block
LOW WASHER FLUID WARNING LAMP
The low washer fluid warning lamp is located in
the instrument cluster. Circuit G29 connects the
warning lamp to the low washer fluid sensor in the
washer fluid reservoir. The switch in the sensor
CLOSES when the fluid level drops below a cali­
brated level. When the switch CLOSES, voltage flows
through the warning lamp to ground on circuit Zl.
HELPFUL INFORMATION
• Check the grounding location for the sensor
• Check the continuity across the switch
DIAGRAM INDEX
Component ^ ^ Page
Fuse 3 (PDC) . . . . . 8W-53-2, 3
Fuse 8 (Fuse Block) 8W-53-2, 3
Ignition Switch . JW-53-2, 3
Intermittent Wiper Control Module .8W-53-2, 3
Intermittent Wiper Switch 8W-53-2
Low Washer Fluid Level Sensor .8W-53-3
Windshield Washer Pump Motor 8W-53-3
Windshield Wiper Motor 8W-53-3