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

Blower Controls


Object Number: 1275043  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Compressor Controls
Fuse Block - I/P LOW BLWER, CRUISE, and HVAC Fuses
Fuse Block - Underhood IGN 2 Fuse
Fuse Block - Underhood BAT 1 Fuse, Fuse Block - I/P RADIO, HVAC, RFA, CLSTR ALDL, BCM PWR, ACCY PWR BUS, RADIO PREM SOUND, and LTR Fuses
Fuse Block - Underhood BAT 2 Fuse, Fuse Block - I/P HI/BLWR, HAZRD, STOP LAMPS, DR/LCK, and PWR/MIR Fuses
Fuse Block - Underhood BAT 1 Fuse, Fuse Block - I/P RADIO, HVAC, RFA, CLSTR ALDL, BCM PWR, ACCY PWR BUS, RADIO PREM SOUND, and LTR Fuses
G200
Figure 2:

Compressor Controls


Object Number: 1378702  Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Temperature Actuators
Blower Controls
Fuse Block - I/P TRN/SIG, AIRBAG, CLSTR, and PCM, BCM, U/H Fuses, Fuse Block-Underhood CRANK and IGN MAIN Relays
Fuse Block - I/P TRN/SIG, AIRBAG, CLSTR, and PCM, BCM, U/H Fuses, Fuse Block-Underhood CRANK and IGN MAIN Relays
G100, G113, and G171
G100, G113, and G171
Fuse Block-Underhood B+ Bus
G100, G113, and G171
EVAP Controls
G100, G113, and G171
Figure 3:

Temperature Actuators


Object Number: 1275046  Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Compressor Controls
Fuse Block - I/P LOW BLWER, CRUISE, and HVAC Fuses
Fuse Block - I/P LOW BLWER, CRUISE, and HVAC Fuses
G200