Wiper and Washer Systems: Description and Operation

WIPER OPERATION

Models without Intermittent Wipers
The front wiper switch is controlled by a lever built into the combination switch.

There are two front wiper switch positions:
- LO speed
- HI speed

With the ignition switch in the ON or START position power is supplied
- through 20 A fuse [No.6 located in the fuse block (J/B)]
- to front wiper motor terminal B.

Low and High Speed Wiper Operation
Ground is supplied to front wiper switch terminal 17 through body grounds E12 and E54.

With the front wiper switch in the LO position ground is supplied
- to front wiper motor terminal L
- through front wiper switch terminal 14.

With power and ground supplied the front wiper motor operates at low speed.

With the front wiper switch in the HI position ground is supplied
- to front wiper motor terminal H
- through front wiper switch terminal 16.

With power and ground supplied the front wiper motor operates at high speed.

Auto Stop Operation
When the front wiper switch is turned OFF the front wiper motor will continue to operate at low speed until wiper blades reach windshield base.

When wiper blades are not located at base of windshield with front wiper switch OFF ground is supplied
- to front wiper motor terminal L
- through front wiper switch terminal 14
- through front wiper switch terminal 13
- through front wiper motor terminal P.

Ground is supplied to front wiper motor terminal E through body grounds E12 and E54.

Models with Intermittent Wipers
The front wiper switch is controlled by a lever built into the combination switch.

There are three front wiper switch positions:
- LO speed
- HI speed
- INT (Intermittent).

With the ignition switch in the ON or START position power is supplied
- through 20 A fuse [No.6 located in the fuse block (J/B)]
- to front wiper motor terminal B and
- to front wiper switch terminal 15.

Low and High Speed Wiper Operation
Ground is supplied to front wiper switch terminal 17 through body grounds E12 and E54

With the front wiper switch in the LO position ground is supplied
- to front wiper motor terminal L
- through front wiper switch terminal 14.

With power and ground supplied the front wiper motor operates at low speed.

With the front wiper switch in the HI position ground is supplied
- to front wiper motor terminal H
- through front wiper switch terminal 16.

With power and ground supplied the front wiper motor operates at high speed.

Auto Stop Operation
When the front wiper switch is turned OFF the front wiper motor will continue to operate at low speed until wiper blades reach windshield base.

When wiper blades are not located at base of windshield with front wiper switch OFF ground is supplied
- from wiper switch terminal 14
- to wiper motor L.
- to front wiper switch terminal 13
- through front wiper motor terminal P
- through front wiper motor terminal E
- through body grounds E12 and E54.

When wiper blades reach base of windshield front wiper motor terminals B and P are connected instead of terminals P and E. Wiper motor will then stop wiper arms at the stop position.

Intermittent Operation
The wiper motor operates the wiper arms one time at low speed at a set interval of approximately 3 to 13 seconds. This feature is controlled by the wiper amplifier (INT SW) combined with wiper switch. When the wiper switch is placed in the INT position ground is supplied to wiper amplifier. The desired interval time is input to wiper amplifier (INT VR) from wiper volume switch combined with wiper switch.

Ground is supplied intermittently
- to front wiper motor terminal L
- through front wiper switch terminal 14
- through front wiper amplifier OUTPUT (located within the front wiper switch)
- through front wiper amplifier GND (located within the front wiper switch)
- through front wiper switch terminal 17
- through body grounds E12 and E54.

WASHER OPERATION
With the ignition switch in the ON or START position power is supplied
- through 20 A fuse [No.6 located in the fuse block (J/B)]
- to front washer motor terminal +.

When the lever is pulled to the WASH position ground is supplied
- to front washer motor terminal -, and
- from front wiper switch terminal 18
- through front wiper switch terminal 17
- through body grounds E12 and E54.

With power and ground supplied the front washer motor operates.

Models with Intermittent Wipers
When the lever is pulled to the WASH position for one second or more the wiper motor operates at low speed for approximately 3 seconds to clean windshield. This feature is controlled by the wiper amplifier in the same manner as the intermittent operation.