Jeep 2013 Grand Cherokee - Manual (Page 209)

Windshield Wiper Operation
Rotate the end of the lever to one of the first four detent
positions for intermittent settings, the fifth detent for low
wiper operation and the sixth detent for high wiper
operation.
Multifunction Lever
Windshield Wiper Operation
3
UNDERSTANDING THE FEATURES OF YOUR VEHICLE 207