GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 TrailBlazer - 2WD 🢒 HVAC 🢒 HVAC Systems - Manual 🢒 HVAC Schematics
Figure 1:

Power, Ground, Serial Data, Blower Motor, and Coolant Bypass Valve
Object Number: 876391 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
A/C Compressor Controls and Pressure Sensors
B+ Bus - Underhood Fuse Block
ACCY/RUN/START, RUN, and START Bus Bars
HVAC I, BRAKE, and TBC RUN Fuses
B+ Bus - Rear Fuse Block
HVAC I, BRAKE, and TBC RUN Fuses
LGM/DSM, OH BATT/ONSTAR, RADIO, and HVAC B Fuses
DLC and SP205
G201 - 1 of 2
G101, G103, G106, and G110
G102, G104, G105, and G109
Figure 2:

A/C Compressor Control and Pressure Sensors
Object Number: 663274 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Actuators
Power, Ground, Serial Data, Blower Motor, and Coolant Bypass Valve
ACCY/RUN and RUN/START Bus Bars
B+ Bus - Underhood Fuse Block
IGN E, TBC IGN1, BACK UP, BTSI, and TRLR B/U Fuses
DLC and SP205
G107 and G108
G101, G103, G106, and G110
Figure 3:

Actuators
Object Number: 876406 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Rear Mode Controls - Body Type VIN 3
A/C Compressor Controls and Pressure Sensors
ACCY/RUN/START, RUN, and START Bus Bars
HVAC I, BRAKE, and TBC RUN Fuses
HVAC I, BRAKE, and TBC RUN Fuses
G201 - 1 of 2
Figure 4:

Rear Mode Controls - Body Type VIN 3
Object Number: 876445 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Rear HVAC - Body Type VIN 6
Actuators
ACCY/RUN/START, RUN, and START Bus Bars
HVAC I, BRAKE, and TBC RUN Fuses
G201 - 1 of 2
Figure 5:

Rear HVAC - Body Type VIN 6
Object Number: 876463 Size: FS
Master Electrical Component List
Air Delivery Description and Operation
Rear Mode Controls - Body Type VIN 3
I/P Dimming Supply - 1 of 2
B+ Bus - Rear Fuse Block
LGM/DSM, OH BATT/ONSTAR, RADIO, and HVAC B Fuses
DLC and SP205
G401, G402, and G403
G201 - 1 of 2