Checked the fuses and the likes?

Fuse 4 20amp is the supply for the rear wiper relay and rear motor.
Fuse 5 10amp is for the wash wipe stalk and supply to intermittent relay.
Fuse 24 is for front wiper relay and supplies wiper motor, it is immediately to the right of K175 on the bottom of the vertical row of four fuses.

K11 intermittent wiper relay, bottom row 2nd from left.
K64 rear wiper relay, above K11.
K175 is the front wiper relay, top row 3rd from left.

Bad contacts on the wiper stalk?

Ginge