Yes, constant power at one of the wires, but I'm not sure what your measurement results were at the others.with the car running and the switch on, using a multi-meter i put ground to black on the plug then red to the different wires, one is constant power for "ON", one is intermediate and the 4th i assume triggers the wiper with the sprayer (this one would have needed 2 people for testing) but since it doesnt work on full on or inter then can kinda guess what the last result would be. . . .
When measuring with the negative meter test lead to the black wire, there should be constant battery voltage at the wire that's yellow with a green stripe (connector pin #1 , as long as the ignition switch is at ACC or ON. (Rear wiper switch can be Off.)
When the ignition switch is at ACC or On (engine need not be running) and the rear wiper switch at the On (continuous) there should be battery voltage at the wire that's light green (pin #2). This is critical. If there isn't battery voltage at pin #2, the motor won't run.
The voltage at the fourth wire (blue with white stripe, pin #4) isn't important until the motor starts to run, at which time it will be at battery voltage when the wiper is in its sweep, and no voltage when the wiper is down at the park position.
It's also important that the black wire (pin #3) has good continuity to the car body (ground). This should be measured using the lowest resistance range (Ohms) on the meter. The reading should ideally be zero Ohms, but might show a few tenths of an Ohm.