GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2003 🢒 Impala 🢒 Body and Accessories 🢒 Wiring Systems 🢒 HVAC Schematics
Figure 1:

Compressor Control
Object Number: 786476 Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Blower Control
A/C Cruise, A/C Fan, CRUISE, PCM/BCM CLSTR, and PCM Fuses
Junction Block-Underhood [Bottom View]
Junction Block-Underhood [Top View]
A/C Cruise, A/C Fan, CRUISE, PCM/BCM CLSTR, and PCM Fuses
B/U LP, DIL/RKE, PWR DROP, and RT HTD ST Fuses
FRT PARK LP, and REAR PK LP Fuses
A/C RLY (CMPR), A.I.R PMP RLY, BCM, CIG/AUX, EXT LTS, IGN
FRT PARK LP, and REAR PK LP Fuses
G201 [2 of 2]
G201 [1 of 2]
DLC
G100, G111, G113 [1 of 2], G117, G151, and G171
Figure 2:

Blower Control
Object Number: 677935 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Temperature Control
Compressor Control
A/C Cruise, A/C Fan, CRUISE, PCM/BCM CLSTR, and PCM Fuses
AUX PWR, BRK SW, C/LTR, DRL/EXT LTS, HAZ SW, HVAC BLO
G202
Figure 3:

Temperature Control
Object Number: 786478 Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Blower Control
A/C Cruise, A/C Fan, CRUISE, PCM/BCM CLSTR, and PCM Fuses
A/C Cruise, A/C Fan, CRUISE, PCM/BCM CLSTR, and PCM Fuses
G202
G202