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

Left Heated Seat


Object Number: 755943  Size: FS
Master Electrical Component List
Heated Seats Description and Operation
RH Heated Seat
HTD SEAT, ATC, HVAC and A/C Fuses
B+ Bus Bar
S313 and S419
G420,G450 and S427 (Utility and Crew Cab)
Ign ACC, RUN and RAP Bus Bar
HVAC and CRUISE Fuses
HVAC and CRUISE Fuses
Figure 2:

Right Heated Seat


Object Number: 755944  Size: FS
Master Electrical Component List
Heated Seats Description and Operation
LH Heated Seat
HTD SEAT, ATC, HVAC and A/C Fuses
B+ Bus Bar
Ign ACC, RUN and RAP Bus Bar
HVAC and CRUISE Fuses
HVAC and CRUISE Fuses
S320 and S420
G420,G450 and S427 (Utility and Crew Cab)