Horn
Pressa 
on the steering wheel pad
to sound the horn.
See also:
Interior
Depending on the Silverado Hybrid's seating configuration, the crew cab can
seat five or six people. Interior features include:
Hybrid badge on tachometer
Fuel economy gauge
Optional navigation ...
Windshield Wiper/Washer
The windshield wiper/washer lever is located on the left side of the steering column.
Turn the band with the wiper symbol to control the windshield wipers.
(Mist): Use for a single wiping cycle.
...
Rear Window Defogger
REAR (Rear Defogger): Press to turn
the rear window defogger on or off. The rear window defogger turns off after about
10 minutes. It can also be turned off by turning the ignition to ACC/ACCESSO ...