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

Power, Ground, and DLC


Object Number: 674594  Size: FS
Master Electrical Component List
Brake Warning System Description and Operation
Brake Switch
IGN SW-BATT 1, HTR A/C IGN, ERLS, PCM, ACC, IPC/BFC Fuses
RH BEC BATT, ABS, COOL FAN (V6) GROUND, INT LPS, RADIO BATT, FOG LPS Fuses
G103 and G105
Figure 2:

Brake Switch


Object Number: 674596  Size: FS
Master Electrical Component List
Brake Warning System Description and Operation
Power, Ground, and DLC
RH HDLP, LH HDLP, GEN BATT, LH BEC BATT 2, STOP LPS, HAZARD LPS, IPC/HVACBATT, BFC BATT Fuses
High Mounted Stop Lamp Assembly