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

Driver Heated Seat


Object Number: 839893  Size: FS
Master Electrical Component List
Heated Seats Description and Operation Front
Front Passenger Heated Seat
Power Seats Schematics
Driver Memory Seat and Memory Switch
Power, Ground, DLC, and Splice Pack SP205
Splice Pack SP206, SP207 and Dedicated TAC Serial Data Circuits
Driver Memory Lumbar, Torso Bolster and Recline
Front Passenger Heated Seat
G302, G304, and G306
Figure 2:

Front Passenger Heated Seat


Object Number: 839895  Size: FS
Master Electrical Component List
Heated Seats Description and Operation Front
Left Rear Heated Seat
Driver Heated Seat
Splice Pack SP206, SP207 and Dedicated TAC Serial Data Circuits
Power, Ground, DLC, and Splice Pack SP205
Driver Memory Lumbar, Torso Bolster and Recline
Driver Heated Seat
Figure 3:

Left Rear Heated Seat


Object Number: 839896  Size: FS
Master Electrical Component List
Heated Seats Description and Operation Front
Right Rear Heated Seat
Front Passenger Heated Seat
B+ Bus
ACCY/RUN/START, RUN, and START Bus Bars, CRANK Fuse
BRAKE, 4WD, CRUISE, HVAC I, and IGN 3 Fuses
PCMB, TREC, IPC/DIC, TBC BATT, SEO B1, SEO B2, and HVAC/ECAS Fuses
Right Rear Heated Seat
Right Rear Heated Seat
CKT 1050, S203, S215, S302, S303, and S351
CKT 1050, S203, S215, S302, S303, and S351
G302, G304, and G306
Figure 4:

Right Rear Heated Seat


Object Number: 839897  Size: FS
Master Electrical Component List
Heated Seats Description and Operation Front
Left Rear Heated Seat
Left Rear Heated Seat
Left Rear Heated Seat
CKT 1050, S203, S215, S302, S303, and S351
CKT 1050, S203, S215, S302, S303, and S351
G302, G304, and G306