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AIR CONDITIONING
Fig 1: Compressor Circuit
HOT AT
HOT W/ IGN MAIN
ALL TIMES
RELAY ENERGIZED
10A
RLY CTRL
CLASS 2 DATA
SENS SIG
5V REF 1
LOW REF
IGN
A/C REQ
CLASS
2 DATA
IGN
A/C REQUEST
IND CTRL
259347
A/C
CLTCH
FUSE 6
UNDERHOOD
FUSE BLOCK
ENGINE CONTROL
MODULE (ECM)
LOGIC
HVAC CONTROL
MODULE
9
17A
8B
C1
53
15
C1
57
37
21
C3
H
C1
1
2
3
DK GRN/WHT
DK GRNDK GRN
BLK BLK
DK GRN/WHT
DK GRN
ORG/BLK
GRY
BLK
WHT
BLK
GRY
ORG/BLK
COMPUTER
DATA LINES
SYSTEM
G115
A/C COMPRESSOR
CLUTCH
DIODE 3
A/C CLTCH RELAY
A/C REQUEST
SWITCH
A/C REQUEST
IND
A/C REFRIGERANT
PRESSURE SENSOR
459
1049
380
2700
2751
1038
(PART OF A/C COMPRESSOR,
BEHIND A/C COMPRESSOR
PULLEY)
(AT ENGINE TO
TRANSMISSION STUD
NEAREST STARTER,
BELOW G113)
(IN UNDERHOOD
COMPT, ABOVE
RIGHT FRONT
WHEEL WELL)
(IN AIR CLEANER
ASSEMBLY)
(IN DASH CENTER
TRIM PANEL, BENEATH RADIO)
(ON HIGH PRESSURE HOSE,
NEAR HIGH PRESSURE
HOSE CONNECTION TO
A/C COMPRESSOR)
YMMS: Apr 6, 2021
Engine: 3.9L Eng License:
VIN: Odometer:
2007 Chevrolet Uplander LT
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Fig 2: Manual A/C Circuit (1 of 2)
HOT AT
HOT ATHOT W/ IGN MAIN
ALL TIMES
RELAY ENERGIZED ALL TIMES
40A 10A
10A
AUX FAN
AUX
IGNIGN
SPEED
TEMP
SELECT
SELECT
CLASS 2
SERIAL
DATA
M
OFF
1
2
1
3
4
5
IGN
SPEED 3 REQ
3
2
GROUND
SPEED 2 REQ
1
SPEED 1 REQ
0
MOTOR OFF REQ
HVAC AUX CNTRL
BATT
AUX
IGN 1
LO REF
MODE SIG
SPEED SIG
5 VOLT
CLASS 2 DATA
REF
2
3
GROUND
LO REF
SUPP VOLT
CTRL SIG
SENS SIG
5 VOLT REF
LOW REF
MOTOR CTRL
AUX MODE
4
DR CTRL
LO REF
5
DR CTRL
CTRL SIG
6
DR CTRL
5V REF
7
COMMOM DR CTRL
8
BLOWER MTR HI CTRL
9
REC DR CTRL
10
RH AIR TEMP DR CTRL
VENT & FLOOR DR CTRL
DEFROST DR CTRL
IGN
SPEED CTRL
A/C
REQUEST
IGN
OFFOFF
HIGH LOWHIGHLOW
DEFOGGER
IGN
REQUEST
A/C REQUEST
DR SEATDR SEATLOW PASS SEATPASS SEAT LOW
IND CTRL
REF REF HTR LOWHTR LOW HTR HIGHHTR HIGH
MMM
DEFOGGER
REQUEST REQUESTREQUEST REQUEST
IGNCTRL IND
259345
UNDERHOOD
FUSE
BLOCK
I/P
FUSE
BLOCK
DIGITAL
VIDEO
DISC
(DVD)
PLAYER
FRT
BLWR HI
FUSE 34
CLSTR/
HVAC
FUSE 8
HVAC/
RPA/
CRUISE
FUSE 17
LOGIC
C1
30
45 C227
B
A
7
D
C
G
F
E
BB
A
A
B
C
D
E
F
G
C3
A
B
C
D
E
F
G
H
J
K
A
L
B
M
C1
A
B
C
D
E
F
G
H
J
K
L
M
C2
1
1
1
6
6
6
PNK RED/WHTRED/BLK
YEL
TAN
LT BLU
BRN/
WHT
PPL
RED/BLK
RED
ORG
BLK
BLK/WHT
RED
ORG
PPL
LT BLU
TAN
YEL
DK GRN
BLK
BRNBRN
BLK
BLK/WHT BLK/WHT
RED/WHT
PNK
WHT
WHT
DK GRN
BLK WHT
GRY
WHT
WHT
TAN
TAN
DK GRN
GRY GRY
ORG ORG
DK BLUDK BLU
YELYEL
YELORG
TAN/BLK YEL
WHT/
BLKWHT/BLK
TAN
WHT
DK GRN
WHT
TAN/BLK
YEL
YEL
TAN
YEL
COMPUTER
DATA LINES
SYSTEM
COMPUTER
DATA LINES
SYSTEM
INTERIOR
LIGHTS
SYSTEM
G200
TEMPERATURE
SELECT
SWITCH
FAN
SPEED
SWITCH
BLOWER MOTOR
RESISTOR ASSEMBLY
BLOWER
MOTOR RELAY
BLOWER MOTOR
HVAC CONTROL MODULE
FRONT BLOWER
MOTOR SWITCH
LOGIC
AUX
BLWR
MOTOR
SWITCH
MODE
SWITCH
TEMPERATURE
CONTROL SWITCH
EVAPORATIVE
TEMPERATURE
SENSOR
DRIVER
TEMPERATURE
CONTROL SWITCH
PASSENGER
TEMPERATURE
CONTROL SWITCH
DEFOGGER
SWITCH
A/C REQUEST
SWITCH
FRONT
PASSENGER
HEATED SEAT
SWITCH
DRIVER
HEATED
SEAT
SWITCH
A/C REQUEST
IND
RECIRCULATION
ACTUATOR
DEFROST
ACTUATOR
VENT & FLOOR
ACTUATOR
PASSENGER
HIGH IND
PASSENGER
LOW IND
DEFOGGER
CONTROL IND
DRIVER
HIGH IND
DRIVER
LOW IND
52
73
72
63
60
71
41
1551
1040
739
2613
1038
1450
8
2622
552
71
2614
2215
1199
1791
52
2274
1236
2273
119
2211
(IN UNDERHOOD
COMPT, ABOVE
RIGHT FRONT
WHEEL WELL)
(RIGHT SIDE OF
DASH, BEHIND
ACCESS PANEL)
(BELOW RIGHT SIDE
OF DASH, IN FRONT
HVAC MODULE)
(BELOW RIGHT SIDE
OF DASH, IN FRONT
HVAC MODULE)
(IN DASH CENTER TRIM
PANEL, BENEATH RADIO)
(IN DASH
HARNESS
BEHIND RADIO,
20 CM FROM
MAIN BUNDLE
TOWARD RIGHT
SIDE OF DASH)
(IN DASH HARNESS,
MAIN BUNDLE,
9 CM FROM BREAKOUT
FOR APP SENSOR
TOWARD LEFT
SIDE OF DASH)
(IN DASH HARNESS,
12.5 CM FROM BREAKOUT
FOR RECIRCULATION ACTUATOR
TOWARD LEFT SIDE OF DASH)
(ON RIGHT SIDE
OF DASH SUPPORT
BEAM, ABOVE DASH
COMPT)
(IN DASH HARNESS,
MAIN BUNDLE,
9 CM FROM
BREAKOUT FOR VENT
& FLOOR ACTUATOR
TOWARD RIGHT
SIDE OF DASH)
(IN FRONT HVAC
MODULE, MOUNTED
TO EVAPORATOR CORE)
(ABOVE BLOWER
MOTOR, ON RIGHT
SIDE OF FRONT
HVAC MODULE)
(BEHIND CENTER
OF DASH, ON LEFT
SIDE OF FRONT
HVAC MODULE)
(BEHIND CENTER
OF DASH, ON LEFT
SIDE OF FRONT
HVAC MODULE)
S271
S246
S255
S253
(IF
EQUIPPED)
(W/ FRONT
A/C)
(W/ AUXILIARY
A/C)
(W/ AUXILIARY
A/C)
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Fig 3: Manual A/C Circuit (2 of 2)
HOT ATHOT AT
HOT W/ IGN MAIN
HOT AT ALL TIMES
ALL TIMESALL TIMES
RELAY ENERGIZED
30A40A
10A
25A
25A
RUN RLY
CTRL
CLASS 2
SERIAL DATA
M
1
M
M
BLWR MOTOR SPEED CTRL
2
AUX BLWR MOTOR SPEED CTRL
3
AUX BLWR MOTOR SPEED SIG
GROUND
RLY CTRL
RLY CTRL
CLASS 2 DATA
RLY CTRL
4
LOW REF
5
ECT SENSOR
6
SENS SIG
7
5V REF 1
8
LOW REF
9
10
CLASS 2
SERIAL DATA
CLASS 2
M
SERIAL
CLASS 2
B+
DATA
B+
SERIAL DATA
M M M
A/C OFF FOR
ENGINE PROTECTION
ENGINE COOLANT HOT
259346
UNDERHOOD
FUSE
BLOCK
A/C
CLTCH
FUSE 6
FAN 1
FUSE 29
FAN 2
FUSE 33
BODY CONTROL
MODULE (BCM)
UNDERHOOD
FUSE
BLOCK
ENGINE CONTROL
MODULE (ECM)
LOGIC
INSTRUMENT PANEL
CLUSTER (IPC)
9
17A
C2
3
1229
8B
6
5
C1
A
38
44
C1
C3
B
32
C1
46
47
B
A
45
C3
B
A
1
2
3
4
53
54
15
C1
49
35
55
57
37
21
C3
25
1
6
1
2
2
1
1
6
1
6
B
A
3
DK GRN/WHT
DK GRN
BLK BLK
PNK BRNBRN
DK GRN
PNK
BRN
LT GRN
WHT
GRY/
DK BLU
BLK
GRY
GRY
WHT
BLK
BLK
BLK
RED
BRN
BLK
LT BLU
GRN
BLK
GRY/BLK
DK GRN
DK GRN
WHT
WHT
BLK BLK
DK GRN/WHT
DK BLU
DK GRN
DK GRN
TANORG/BLK
GRY
ORG
YEL
ORG/BLK
DK BLU
GRY
YEL
YEL
BLK
YEL
YEL
WHT/BLK
GRY
DK BLU
YEL
YEL
WHT/BLK
YEL
ORG
GRY
YEL
BLK
GRY
YEL
ORG/BLK
ORG/BLK
COMPUTER
DATA LINES
SYSTEM
COMPUTER
DATA LINES
SYSTEM
G115
G100
G401
RUN RLY
RELAY
RR
BLWR/
110VAC
FUSE 26
FRT/
BLWR
FUSE 27
A/C
COMPRESSOR
CLUTCH
DIODE 3
A/C CLTCH
RELAY
AUXILIARY
BLOWER
MOTOR
FAN 1 RELAY
FAN 2 RELAY
LEFT COOLING
FAN
FAN 3 RELAY
RIGHT COOLING FAN
AUXILIARY BLOWER MOTOR CONTROL MODULE
AIR TEMPERATURE
ACTUATOR
A/C REFRIGERANT
PRESSURE SENSOR
RIGHT AIR
TEMPERATURE
ACTUATOR
AUXILIARY MODE
ACTUATOR
AUXILIARY AIR
TEMPERATURE
ACTUATOR
LEFT AIR
TEMPERATURE
ACTUATOR
ENGINE COOLANT
TEMPERATURE
(ECT) SENSOR
MESSAGE CENTER
HOT COOLANT
IND
739
1037
754
2211
2613
350
459
473
1049
335
2761
410
380
2700
2751
(IN UNDERHOOD
COMPT, ABOVE
RIGHT FRONT
WHEEL WELL)
(PART OF A/C
COMPRESSOR,
BEHIND A/C
COMPRESSOR
PULLEY)
(AT ENGINE TO
TRANSMISSION STUD NEAREST
STARTER, BELOW G113)
(BELOW LEFT SIDE
OF DASH, LEFT OF
STEERING COLUMN)
(BEHIND LEFT
REAR INTERIOR
BODY PANEL)
(IN FORWARD
LAMP HARNESS,
6.5 CM FROM
BREAKOUT FOR
G100,
TOWARD C110)
(BEHIND LEFT
SIDE OF RADIATOR)
(IN FORWARD
LAMP HARNESS,
6 CM FROM
BREAKOUT FOR
C104
TOWARD C110)
(RIGHT SIDE OF ENGINE
COMPT ON UPPER FRONT
OF RADIATOR SUPPORT)
(IN UNDERHOOD
COMPT, ABOVE
RIGHT FRONT
WHEEL WELL)
(BEHIND RIGHT
SIDE OF RADIATOR)
(IN BODY HARNESS, 6.5 CM
FROM BREAKOUT FOR
C479 TOWARD LEFT "C" PILLAR)
(ON LOWER
LEFT "D"
PILLAR)
(IN REAR HVAC MODULE, BEHIND
LEFT REAR INTERIOR BODY PANEL)
(IN AIR CLEANER
ASSEMBLY)
(ON HIGH PRESSURE HOSE,
NEAR HIGH PRESSURE HOSE
CONNECTION TO A/C COMPRESSOR)
(IN REAR HVAC
MODULE, BEHIND
LEFT REAR INTERIOR
BODY PANEL)
(BEHIND LEFT REAR
INTERIOR
BODY PANEL)
(TOP REAR
OF ENGINE)
(RIGHT SIDE
HVAC MODULE)
(BEHIND CENTER
OF DASH)
S102
S106
S413
(W/ REAR
A/C)
(W/ REAR A/C)
(W/ FRONT A/C)
(W/ REAR A/C)
(W/ AUXILIARY
A/C)
(W/ REAR A/C)
(W/ AUXILIARY
A/C)
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