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

Under Right Side of I/P


Object Number: 1382406  Size: LF
(1)Blower Motor
(2)Blower Motor Resistor (C60 or CJ3) or Blower Motor Control Module (CJ2)
(3)Auxiliary Drop Connector
Figure 2:

Left Rear of Passenger Compartment


Object Number: 1685135  Size: MF
(1)Speaker - LR Subwoofer (UQ3) (RR Similar)
(2)Auxiliary Power Outlet - Rear
(3)Trim Panel