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

Rear Underbody


Object Number: 1409337  Size: LF
(1)C451
(2)Air Suspension Compressor 1 Connector
(3)Air Suspension Compressor 2 Connector
(4)Air Suspension Pressure Sensor
(5)Air Suspension Inlet Valve-LR
(6)Air Suspension Inlet Valve-RR
(7)Air Suspension Exhaust Valve Connector
(8)Air Suspension Air Dryer
(9)Air Suspension Compressor 1
(10)Air Suspension Compressor 2
(11)Air Suspension Module
(12)C450
Figure 2:

Chassis and Body Mounted Components


Object Number: 1506558  Size: LF
(1)Electronically Controlled Air Suspension Relay
(2)Chassis Harness
(3)I/P Compartment
(4)Traction Control Switch
(5)Tow/Haul Switch
(6)Ride Height Switch
(7)Air Suspension Sensor - Left Rear
(8)Air Suspension Inflator Switch
Figure 3:

Air Suspension Module Connections


Object Number: 1769001  Size: MF
(1)Air Suspension Module
(2)G402
(3)C451
(4)Rear Axle
(5)C450
Figure 4:

Right Rear Corner of Cargo Bed (SUT)


Object Number: 1489087  Size: LF
(1)Air Inflator Switch (ZM6)
(2)Auxiliary Power Outlet - Cargo (SUT)
Figure 5:

Electronically Controlled Air Suspension Relay


Object Number: 1824179  Size: MF
(1)Master Cylinder
(2)Electronically Controlled Air Suspension Relay
(3)Chassis Harness