GM Service Manual Online
For 1990-2009 cars only
Figure 1:

Horn Location


Object Number: 1653144  Size: MF
(1)Horn
(2)Forward Lamp Harness
(3)G101
Figure 2:

Steering Wheel Components (3-Spoke)


Object Number: 1692464  Size: LF
(1)Steering Wheel Controls - Left
(2)Steering Wheel Controls - Right
(3)Horn Switch