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

Blower Control


Object Number: 785583  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
A/C Compressor Control
WASH, RR WIP, WIPER, ECU-IG, GAUGE, HEATER, and DEF Fuses
S221
SP200 and G200
Heater Relay, Right Instrument Panel Junction Block
SP201 and G201
SP201 and G201
IP Lamp Dimmer
Figure 2:

A/C Compressor Control


Object Number: 785586  Size: FS
Master Electrical Component List
Air Temperature Description and Operation
Cooling Fan
Blower Control
WASH, RR WIP, WIPER, ECU-IG, GAUGE, HEATER, and DEF Fuses
Heater Relay, Right Instrument Panel Junction Block
Right Instrument Panel Junction Block
SP201 and G201
IP Lamp Dimmer
Figure 3:

Cooling Fan Control


Object Number: 785588  Size: FS
Master Electrical Component List
Air Temperature Description and Operation
A/C Compressor Control
WASH, RR WIP, WIPER, ECU-IG, GAUGE, HEATER, and DEF Fuses
ALT, ABS-2, RDI, ABS-1 and FR FOG Fuses
G100, G101, G102 and G103
S103 and G103