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

Power, Ground and Blower Motor Controls


Object Number: 1786794  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Control Module References
Compressor Controls
Underhood Fuse Block DRL, HI/BEAM and LO/BEAM Relays, ABS, DRL, EPS, IBCM 1, IBCM 2, LT HI BEAM, LT LOW BEAM, RT HI BEAM, RT LOW BEAM, PCM and TCM Fuses
Underhood Fuse Block RBEC 2, RUN RLY, Body Control Module (BCM), HVAC BLOWER HIGH Relay, RUN Relay, HVAC BLOWER, HVAC CTRL (IGN) Rear Fuse Block FUEL/PMP Relay, PARK LP Relay, TRUNK Relay, DRV ST
Underhood Fuse Block IBCM 1, Body Control Module (BCM) AIRBAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR and RADIO Fuses
Underhood Fuse Block IBCM 1, Body Control Module (BCM) AIRBAG (BATT), CLUSTER/THEFT, HVAC CTRL (BATT), IGN SENSOR and RADIO Fuses
G201
G203
Figure 2:

Compressor Controls


Object Number: 1786801  Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Control Module References
Air Temperature and Mode Controls
Power, Ground and Blower Motor Controls
Underhood Fuse Block A/C CLUTCH and PWR/TRN Relays, A/C CLU, EMISSION 1, ETC and INJ Fuses
Low Speed Serial Data
Underhood Fuse Block A/C CLUTCH and PWR/TRN Relays, A/C CLU, EMISSION 1, ETC and INJ Fuses
Power, Ground and High Speed Serial Data
G106
Figure 3:

Air Temperature and Mode Controls


Object Number: 1786803  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Control Module References
Compressor Controls