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

PCM Power, Ground, Serial Data, and MIL


Object Number: 1237508  Size: FS
Underhood Fuse Block B+ Bus - 4.6L
Underhood Fuse Block B+ Bus - 4.6L
DIM, PCM, and EBCM Signals Traction, ABS, Brake, Battery and MIL Indicators
Serial Data Class 2
Ignition Switch Positions
Starting Control
Rear Fuse Block - B+ Bus
G108, G110, and G111 - 4.6L
Master Electrical Component List
Automatic Transmission Inline 20-Way Connector Description
Stop Lamp Switch and Transaxle Solenoids
OBD II Symbol Description Notice
Figure 2:

Stop Lamp Switch and Transaxle Solenoids


Object Number: 1239671  Size: FS
Rear Fuse Block - B+ Bus
IGN-1, Vent Sol, and SIR Fuses
Power and Ground - 3.8L
Underhood Fuse Block B+ Bus - 4.6L
Master Electrical Component List
Automatic Transmission Inline 20-Way Connector Description
Sensors
PCM Power, Ground, Serial Data, and MIL
OBD II Symbol Description Notice
Figure 3:

Sensors


Object Number: 1239680  Size: FS
Master Electrical Component List
Automatic Transmission Inline 20-Way Connector Description
Transmission Internal Mode Switch (IMS) and VSS
Stop Lamp Switch and Transaxle Solenoids
OBD II Symbol Description Notice
Figure 4:

Transmission Internal Mode Switch (IMS) and VSS


Object Number: 1239684  Size: FS
G108, G110, and G111 - 4.6L
Master Electrical Component List
Automatic Transmission Inline 20-Way Connector Description
Sensors
OBD II Symbol Description Notice