ELECTRICAL ACCESSORIES CHAPTER 11

WINDSHIELD WIPERS SYSTEMS OPERATION CHAPTER 11

OBJECTIVES Explain operation of 2 and 3 speed wiper motors, permanent magnet and electromagnetic field designs Describe intermittent wipers Explain depressed wipers Explain washer pump systems

TYPES OF WIPER SYSTEMS STANDARD TWO & THREE SPEED SYSTEM TWO OR THREE SPEED WITH INTERMITTENT OPERATION BOTH CAN INCLUDE DEPRESSED FEATURE INTERMITTENT WIPER SYSTEMS

PERMANENT WIPER MOTORS MOTORS USE PERMANENT MAGNET FIELDS SPEED IS CONTROLLED BY BRUSH PLACEMENT 3 BRUSHES, COMMON, LOW , HIGH FIG 11-12

ELECTROMAGNETIC FIELD MOTORS SPEED CONTROLLED BY SHUNT FIELD USUALLY GROUND TYPE SWITCH CONTROLLED OFF POSITION 11-19

LOW SPEED 2 SPEED SYSTEM

HIGH SPEED 2 SPEED SYSTEM

PARKING 2 SPEED SYSTEM 11-22

3 SPEED SYSTEM MEDIUM POSITION 11-25

INTERMITTENT WIPERS Power for wiper motor is supplied by module (capacitor) Module uses low speed circuit Motor uses park contact to make one sweep per activation FIG 11-29. CLASS MANUAL

INTERMITTENT WIPERS

DEPRESSED WIPER SYSTEM CURRENT TRAVELS THROUGH WIPER/WASHER SWITCH TWICE. DOUBLE PARK SWITCHES PROVIDE REVERSE CURRENT THROUGH IN PARK POSITION ALLOWING 15 DEGREES REVERSE MOTOR ROTATION. SEE C338 - 339

DEPRESSED IN LOW SPEED

DEPRESSED WHEN PARKING

DEPRESSED OFF AFTER PARKING

WASHER PUMPS PUMPS CAN BE EXTERNAL OR INTERNAL TO WIPER MOTOR ASSY. INTERMITTENT WIPERS HAVE TIMED WASHER 11-36 C341

THE END OF WIPERS SYSTEMS