System outline

With the power sw pushed to ig on position, the current flows to terminal (b) 2 of the wiper and washer sw, and terminal 2 of the front wiper motor through the wip fuse.

1. Low speed position 

   With the wiper and washer sw turned to lo position, the current flows from terminal (b) 2 of the wiper and washer sw to terminal (b) 3 to terminal 5 of the front wiper motor to terminal 4 to ground, which runs the front wiper motor at low speed.

2. High speed position 

   With the wiper and washer sw turned to hi position, the current flows from terminal (b) 2 of the wiper and washer sw to terminal (b) 4 to terminal 3 of the front wiper motor to terminal 4 to ground, which runs the front wiper motor at high speed.

3. Int position 

   With the wiper and washer sw turned to int position, the wiper relay operates and current flows from terminal (b) 2 of the wiper and washer sw to terminal (a) 2 to ground. This activates the intermittent circuit and the current flows from terminal (b) 2 of the wiper and washer sw to terminal (b) 3 to terminal 5 of the front wiper motor to terminal 4 to ground and then the wiper operates. Intermittent operation is controlled by a condenser's charge and discharge function in the relay.

4. Washer interlocking operation 

   With the wiper and washer sw pulled to washer position (washer sw on position), the current flows from the wsh fuse to terminal 1 of the front washer motor to terminal 2 to terminal (a) 3 of the wiper and washer sw to terminal (a) 2 to ground and runs the washer motor and the window washer to spray. Simultaneously, current flows from the wip fuse to terminal (b) 2 of the wiper and washer sw to terminal (b) 3 to terminal 5 of the front wiper motor to terminal 4 to ground, which activates the wiper.