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

Under Front Fascia


Object Number: 1877895  Size: LF
(1)Horn - Right
(2)Horn - Left
Figure 2:

Entertainment Components


Object Number: 1865882  Size: LF
(1)Speaker - Left Tweeter
(2)Steering Wheel Control Switch - Right (UK3)
(3)Radio/Navigation Unit (U2K)
(4)Speaker - Right Tweeter
(5)Windshield Side Molding Garnish - Right
(6)Speaker - Right Front Door
(7)Digital Radio Antenna (U2K)
(8)Speaker - Right Rear
(9)Instrument Panel Body Harness
(10)Speaker - Subwoofer (UQ3)
(11)X401 (U2K)
(12)Digital Radio Receiver (U2K)
(13)Cellular and Navigational Antenna (U2K)
(14)Audio Amplifier (UQ3)
(15)Speaker - Left Rear
(16)Speaker - Left Front Door
(17)Steering Wheel Control Switch - Left (K34)
(18)Windshield Side Molding Garnish - Left
(19)Horn Switch