Yellow Windshield Washer Icon Blinking Off and On.

[Betrivent]

It wouldn't come on with the ignition. The reason you're seeing it flickering is because it's low enough that the fluid moving around while driving causes it to set the light off - but it's full enough that when completely still the sensor still detects fluid.

If it was below the sensor at a standstill, then you would see it come on when you start the car.

[bronsin]

Originally Posted by Betrivent

It wouldn't come on with the ignition. The reason you're seeing it flickering is because it's low enough that the fluid moving around while driving causes it to set the light off - but it's full enough that when completely still the sensor still detects fluid.

If it was below the sensor at a standstill, then you would see it come on when you start the car.

Interesting! I just filled the tank but before I did it was staying on for long periods but still not on when turning on the ignition. I thought all warning lights came on when you turned on the ignition to test the bulb...