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

L18 Throttle Actuator Control Power, Ground and Data Circuits


Object Number: 650749  Size: FS
Master Electrical Component List
Cruise Control Description and Operation W/ETC
L18 Cruise Control Input Circuits
IGN A Fuse and Ignition Switch
ENG I and IGN-E Fuse - L18
G104, L18, 1 of 2, All Except HO2S Circuit
Figure 2:

L18 Cruise Control Input Circuits


Object Number: 650750  Size: FS
Master Electrical Component List
Cruise Control Description and Operation W/ETC
L18 Throttle Actuator Control Power, Ground and Data Circuits
ABS, Blower, Stop-Haz, and IGN B Fuses, and Ignition Switch
EBCM Power, Grounding, DLC, and Indicator Lamps
PTO Control Provisions
Lighting and Battery Fuses
Stop/Haz, Radio Batt, Aux Pwr, and Cig Ltr Fuses
Stop and Turn/Hazard Lamps Controls
PTO Control Provisions
PTO Control Provisions
EBCM Stoplamp Switch and Wheel Speed Inputs
Figure 3:

L65 Cruise Control Circuit


Object Number: 650751  Size: FS
Master Electrical Component List
Cruise Control Description and Operation Diesel
Lighting and Battery Fuses
Stop/Haz, Radio Batt, Aux Pwr, and Cig Ltr Fuses
ABS, Blower, Stop-Haz, and IGN B Fuses, and Ignition Switch
EBCM Power, Grounding, DLC, and Indicator Lamps
VSS Circuit
EBCM Stoplamp Switch and Wheel Speed Inputs
Stop and Turn/Hazard Lamps Controls