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

Driver Heat Controls


Object Number: 1778492  Size: FS
Master Electrical Component List
Heated Seats Description and Operation
Control Module References
Passenger Heat Controls
B+ Bus - Underhood Fuse Block - 1 of 2
HVAC BLWR, HVAC CNTRL HD, PWR HTR SWTCH, TCCM SWTCH, and VSES/ABS Fuses
Lumbar Controls and Power Seat
Lumbar Controls and Power Seat
G340 and G345
Figure 2:

Passenger Heat Controls


Object Number: 1778500  Size: FS
Master Electrical Component List
Heated Seats Description and Operation
Control Module References
Heated/Cooled Seat Schematics and Information
B+ Bus - Underhood Fuse Block - 1 of 2
HVAC BLWR, HVAC CNTRL HD, PWR HTR SWTCH, TCCM SWTCH, and VSES/ABS Fuses
Driver Seat Schematics
Driver Seat Schematics
G340 and G345