WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Power, Ground and PWM Circuits Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 2: AF Fuel Mode and Injector Power Relays Schematic - KL6
Courtesy of GENERAL MOTORS CORP.
Fig 3: AF Injector Power Relays Schematic - KL8
Courtesy of GENERAL MOTORS CORP.
Fig 4: AF Fuel Injectors Schematic
Courtesy of GENERAL MOTORS CORP.
Fig 5: AF Odd Bank Injector Relays Schematic - KL6
Courtesy of GENERAL MOTORS CORP.
Fig 6: AF Even Bank Injector Relays Schematic - KL6
Courtesy of GENERAL MOTORS CORP.
Fig 7: AF Odd Bank Injector Signal Schematic - KL6
Courtesy of GENERAL MOTORS CORP.
Fig 8: AF Odd Bank Injector Signal Schematic - KL8
Courtesy of GENERAL MOTORS CORP.
Fig 9: AF Even Bank Injector Signal Schematic - KL6
Courtesy of GENERAL MOTORS CORP.
Fig 10: AF Even Bank Injector Signal Schematic - KL8