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

Power, Ground, Warning Lamps, Stop Lamp Switch


Object Number: 1257035  Size: FS
Master Electrical Component List
Wheel Speed Sensors, Electronic Brake Control Module (EBCM)
Underhood Fuse Block - IGN2 Fuse, Ignition Switch, I/P Fuse Block - AUTO A/C BCM, HVAC EPS, ABS and HTD MIR Fuses
I/P Fuse Block - WPR, TCM BTSI, BCM ABS, CLSTR AUTO A/C and WSWA Fuses
Underhood Fuse Block - A/C and IP Fuse BATT, I/P Fuse Block - RADIO CRUISE, AUTO HVAC CLSTR, and DLC Fuses
Underhood Fuse Block - IGN2 Fuse, Ignition Switch, I/P Fuse Block - AUTO A/C BCM, HVAC EPS, ABS and HTD MIR Fuses
Underhood Fuse Block - A/C and IP Fuse BATT, I/P Fuse Block - RADIO CRUISE, AUTO HVAC CLSTR, and DLC Fuses
Stop Lamps
Brake Lamp Warning Circuit
Power, Ground, Hold Switch and DLC
Data Link Connector
Stop Lamps
Data Link Connector
G201, G202
Figure 2:

Wheel Speed Sensors, Electronic Brake Control Module (EBCM)


Object Number: 1257042  Size: FS
Master Electrical Component List
Traction Control System (TCS) Switch, Serial Data
Power Ground, Warning Lamps, Stop Lamp Switch
Figure 3:

Traction Control System (TCS) Switch, Serial Data


Object Number: 1461101  Size: FS
Master Electrical Component List
Transmission Control Module (TCM) - Engine Control Module (ECM) Communications
G201, G202