Mist Operation
WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
In the MIST position, voltage is supplied through a internal 562 Ω resistor to the signal circuit of the windshield wiper/washer switch for the BCM. The BCM will momentarily energizes the Wiper 1 relay which will operate the windshield wiper motor at low speed.
The windshield wipers make one sweep at low speed and returns to the park position. If the windshield wiper/washer switch is held in MIST mode, the windshield wipers will continue to operate until the switch is released.