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

Center of the I/P


Object Number: 826775  Size: LF
(1)Marker Lamp Switch (RQ2 and U86 or RQ3)
(2)Air Brake Pressure Gage (JE4)
(3)High Idle Switch (UF3)
(4)Automatic Transmission Fluid Temperature (TFT) Gage (Allison® LCT/UTX)
(5)Traction Control Switch (NW9)
(6)Outside Heated Mirror Switch (DB6/DB8)
(7)Exhaust Brake Switch (K40)
(8)Rear Axle Driver Control Switch (HPZ/Automatic Transmission)
(9)Inflatable Restraint I/P Module Disable Switch (AK5 w/o AQR)
(10)Air Suspension Dump Switch (G40/G45/GSJ)
(11)Power Take-Off (PTO) Switch
(12)Driver Information Center (DIC)
Figure 2:

Center of Vehicle


Object Number: 822020  Size: LF
(1)Fuel Pump and Sender Assembly
(2)Primary Fuel Tank
(3)C420
(4)Fuel Sender - Secondary
Figure 3:

Chime Module


Object Number: 1430187  Size: LF
(1)Chime Module
Figure 4:

Fuel Senders, G400, Low Air Alarms, Splice Pack SP400 (Ground Block) - LG4/LG5


Object Number: 953488  Size: LF
(1)Fuel Sender - Primary
(2)Fuel Tank
(3)Low Air Pressure Switch - Primary
(4)Low Air Pressure Switch - Secondary
(5)Splice Pack SP400 (Ground Block - 6 cavities)
(6)Fuel Sender - Secondary Connector
(7)Ground G400
(8)Fuel Sender - Secondary
(9)Fuel Tank - Secondary
Figure 5:

Front Left of the I/P


Object Number: 826805  Size: LF
(1)Radio
(2)Park Brake Release Switch
(3)HVAC Control Module
(4)Overdrive Defeat Switch
(5)Headlamp Switch
(6)Instrument Panel Cluster
Figure 6:

Lower Back of Engine


Object Number: 1702248  Size: LF
(1)Knock Sensor (KS) Bank 2
(2)Engine Oil Level Switch
(3)Starter Solenoid
(4)Engine Chassis Harness