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

Cruise Control Switch


Object Number: 743555  Size: FS
Master Electrical Component List
Cruise Control Description and Operation
Brake Switch Input
ACCY/RUN/START, RUN, and START Bus Bars
B+ Bus - Underhood Fuse Block
HVAC I, BRAKE, and TBC RUN Fuses
HVAC I, BRAKE, and TBC RUN Fuses
Stop Lamps
TRAILER, ABS, ATC, BLOWER, ELEK BRK, CIGAR, ST/LP, VEH CHMSL, and VEH STOP Fuses
TRAILER, ABS, ATC, BLOWER, ELEK BRK, CIGAR, ST/LP, VEH CHMSL, and VEH STOP Fuses
Figure 2:

Brake Switch Input


Object Number: 743557  Size: FS
Master Electrical Component List
Cruise Control Description and Operation
Cruise Control Switch
ACCY/RUN and RUN/START Bus Bars
IGN E, TBC IGN1, BACK UP, BTSI, and TRLR B/U Fuses