GM Service Manual Online
For 1990-2009 cars only

HVAC Schematics C40


Object Number: 1800120  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Batteries - LG4/LG5 and B+ Bus
Ignition Switch - RUN and ACC/RUN Bus Bars and IGN 3 Fuse
AXL/4WD, BRK, HTR/AC, and HYD/AIR BRK Fuses/Circuit Breakers
Interior Lights Dimming Schematics
G103, G105, and G106
G103, G105, and G106
G112, G113, G203 - 4 of 4, G204, G205, and G400

HVAC Schematics C60

Figure 1:

Blower Controls


Object Number: 1800125  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
A/C Compressor Controls - L18/LLY
Batteries - LG4/LG5 and B+ Bus
Ignition Switch - RUN and ACC/RUN Bus Bars and IGN 3 Fuse
AXL/4WD, BRK, HTR/AC, and HYD/AIR BRK Fuses/Circuit Breakers
A/C Compressor Controls - L18/LLY
A/C Compressor Controls - LG4/LG5
Interior Lights Dimming Schematics
G103, G105, and G106
G103, G105, and G106
G112, G113, G203 - 4 of 4, G204, G205, and G400
Figure 2:

A/C Compressor Controls - L18/LLY


Object Number: 1800129  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
A/C Compressor Controls - LG4/LG5
Blower Controls
Blower Controls
Ignition Switch - RUN and ACC/RUN Bus Bars and IGN 3 Fuse
AXL/4WD, BRK, HTR/AC, and HYD/AIR BRK Fuses/Circuit Breakers
Batteries - LG4/LG5 and B+ Bus
G100 - L18
G100 - LLY
Figure 3:

A/C Compressor Controls - LG4/LG5


Object Number: 1800219  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
A/C Compressor Controls - L18/LLY
Blower Controls
Batteries - LG4/LG5 and B+ Bus
G100 - LG4
G100 - LG5

HVAC Schematics C36


Object Number: 1800134  Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Ignition Switch - RUN and ACC/RUN Bus Bars and IGN 3 Fuse
AXL/4WD, BRK, HTR/AC, and HYD/AIR BRK Fuses/Circuit Breakers
BAT/HAZ, HAZRD, PWR/ACCY, STOP, and TRLR Fuses/Circuit Breakers
G102 - 2 of 2