GM Service Manual Online
For 1990-2009 cars only
Rear Wiper:  Turn the end of the lever to low or high, to turn on the rear window wiper.

(Low): For steady rear wiping at low speed.

(High):  For steady rear wiping at high speed.

(Rear Washer): Turn the end of the lever up or down as far as it will go, to squirt washer fluid on the rear window. The knob automatically returns from these positions after it is released.

The windshield washer reservoir is used for the windshield and the rear window. Check the fluid level in the reservoir if either washer is not working. See Windshield Washer Fluid .

Caution: In freezing weather, do not use your washer until the windshield is warmed. Otherwise the washer fluid can form ice on the windshield, blocking your vision.