Wiper Operation

The front wiper switch is controlled by a lever built into the combination switch.

There are three wiper switch positions:

LO speed

HI speed

INT (Intermittent)

With the ignition switch in the ACC or ON position, power is supplied

through 20A fuse [No. 19, located in the fuse block (J/B)]

to front wiper motor terminal 1, 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 E13 and E41.

When the front wiper switch is placed in the LO position, ground is supplied

through terminal 14 of the front wiper switch

to front wiper motor terminal 5.

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

When the front wiper switch is placed in the HI position, ground is supplied

through terminal 16 of the front wiper switch

to front wiper motor terminal 3.

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

Auto Stop Operation 

With front wiper switch turned OFF, front wiper motor will continue to operate until wiper arms reach windshield base.

When wiper arms are not located at base of windshield with front wiper switch OFF, ground is provided from terminal 14 of the front wiper switch

to front wiper motor terminal 5, in order to continue front wiper motor operation at low speed.

Ground is also supplied

to terminal 13 of the front wiper switch

through front wiper motor terminal 4

through terminal 6 of the front wiper motor, and

through body grounds M77 and M111.

When wiper arms reach base of windshield, front wiper motor terminals 1 and 4 are connected instead of terminals 4 and 6. Front wiper motor will then stop wiper arms at the PARK position.

Intermittent Operation 

The front wiper motor operates the wiper arms one time at low speed at a set interval of approximately 2 to 13 seconds. This feature is controlled by the wiper amplifier built in the front wiper switch.

When the front wiper switch is placed in the INT position, ground is supplied

to wiper amplifier (INT SW)

from front wiper switch terminal 17

through body grounds E13 and E41, and

to front wiper motor terminal 5

through the front wiper switch terminal 14

through wiper amplifier (OUTPUT)