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

Front Frame Rail


Object Number: 1870627  Size: LF
(1)X300
(2)G300
(3)Automatic Transmission Turbine Speed Sensor
(4)Automatic Transmission Input Shaft Speed (AT ISS) Sensor
(5)Automatic Transmission
(6)Vehicle Speed Sensor (VSS)
(7)X124
(8)Power Take Off (PTO) Module
(9)X175
Figure 2:

Front of the I/P -YE9


Object Number: 1855926  Size: LF
(1)Driver Information Center (DIC) Switch (UK3)
(2)Instrument Panel Cluster (IPC)
(3)Radio
(4)Ambient Light/Sunload Sensor Assembly (CJ2)/Ambient Light Sensor (C67/C42)
(5)HVAC Control Module
(6)Inflatable Restraint I/P Module Disable Switch (C99)
(7)Power Take-Off (PTO) Switch
(8)Auxiliary Power Outlet - Front 2
(9)I/P Multifunction Switch Assembly (JL4/JF4/UD7/XA7)
(10)Auxiliary Power Outlet - Front 1
(11)Transfer Case Shift Control Switch (NQF/NQH)
(12)Trailer Brake Control Panel Switch (JL1)
(13)Headlamp and Panel Dimmer Switch