Originally Posted by bluecoupe
I read the exterior rear view mirror heaters and the rear window defrost operate from the same switch. Could it be that the washer heaters are also integrated? That's be my guess.
It is my understanding that the washer fluid is heated due to the placement of the fluid reservoir. If the car is running, you should have heated windshield washer fluid.
And yes, I believe the side mirror heaters are activated with the rear defrost button.
Cheers.