GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2003 🢒 Yukon - 4WD 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 HVAC Connector End Views
Table 1: A/C Compressor Clutch
Table 2: A/C Low Pressure Switch
Table 3: A/C Refrigerant Pressure Sensor
Table 4: Air Temperature Actuator - Left
Table 5: Air Temperature Actuator - Right
Table 6: Ambient Light Sensor
Table 7: Auxiliary Temperature Actuator
Table 8: Auxiliary Mode Actuator
Table 9: Blower Motor
Table 10: Blower Motor Resistor Assembly
Table 11: Blower Motor Resistor Assembly - Auxiliary - C1
Table 12: Blower Motor Resistor Assembly - Auxiliary - C2
Table 13: Blower Motor - Auxiliary
Table 14: HVAC Control Module - C1
Table 15: HVAC Control Module - C2
Table 16: HVAC Control Assembly - Front Auxiliary - w/ A/C
Table 17: HVAC Control Assembly - Rear Auxiliary - w/ A/C
Table 18: HVAC Control Assembly - Front Auxiliary - w/ Heat and A/C
Table 19: HVAC Control Assembly - Rear Auxiliary - w/ Heat and A/C
Table 20: HVAC Control Processor - Auxiliary
Table 21: Mode Actuator
Table 22: Recirculation Actuator

A/C Compressor Clutch


Object Number: 684852 Size: CH

Connector Part Information
    • 12162017
    • 2-Way F Metri-Pack 150 Series (MD GRY)

Pin

Wire Color

Circuit No.

Function

A

BLK

550

Ground

B

DK GRN

59

A/C Compressor Clutch Supply Voltage

A/C Low Pressure Switch


Object Number: 537107 Size: CH

Connector Part Information
    • 12052644
    • 2-Way F Metri-Pack 150 Series (LT GRY)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

204

A/C Low Pressure Sensor Signal

B

BLK

550

Ground

A/C Refrigerant Pressure Sensor


Object Number: 726824 Size: CH

Connector Part Information
    • 15344137
    • 3-Way F GT 150 Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

1

BLK

2751

Low Reference

2

GRY

2700

5 Volt Reference

3

RED/BLK

380

A/C Refrigerant Pressure Sensor Signal

Air Temperature Actuator - Left


Object Number: 280764 Size: CH

Connector Part Information
    • 12064993
    • 6-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5

BRN

341

Ignition 3 Voltage

6

DK BLU

1199

Left Air Temperature Door Control

7

YEL

1791

Ground

8

--

--

Not Used

9

LT BLU

733

Air Temperature Door Position Signal

10

LT BLU/

BLK

1688

5 Volt Reference

Air Temperature Actuator - Right


Object Number: 280764 Size: CH

Connector Part Information
    • 12064993
    • 6-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5

BRN

341

Ignition 3 Voltage

6

WHT/BLK

1236

Right Air Temperature Door Control

7

YEL

1791

Ground

8

--

--

Not Used

9

DK BLU

1646

Right Air Temperature Door Position Signal

10

LT BLU/

BLK

1688

5 Volt Reference

Ambient Light Sensor


Object Number: 82383 Size: CH

Connector Part Information
    • 12047662
    • 2-Way F Metri Pack 150 Series (BLK)

Pin

Wire Color

Circuit Number

Function

A

WHT

278

Ambient Light Sensor Signal

B

BLK

279

Ambient Light Sensor Low Reference

Auxiliary Temperature Actuator


Object Number: 280764 Size: CH

Connector Part Information
    • 12064993
    • 6-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5-6

--

--

Not Used

7

BLK

1450

Ground

8

WHT/BLK

1236

Auxiliary Air Temperature Door Control

9

--

--

Not Used

10

BRN

541

Ignition 3 Voltage

Auxiliary Mode Actuator


Object Number: 280764 Size: CH

Connector Part Information
    • 12064993
    • 6-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5-6

--

--

Not Used

7

BLK

1450

Ground

8

WHT

454

Auxiliary Mode Door Control

9

--

--

Not Used

10

BRN

541

Ignition 3 Voltage

Blower Motor


Object Number: 62488 Size: CH

Connector Part Information
    • 12084957
    • 2-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

PPL

65

Blower Motor Supply Voltage

B

BLK

1050

Ground

Blower Motor Resistor Assembly


Object Number: 73146 Size: CH

Connector Part Information
    • 12052854
    • 7-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

TAN

63

Medium 1 Blower Motor Control

B

YEL

60

Blower Motor Low Control

C

PPL

73

Medium 3 Blower Motor Control

D

LT BLU

72

Medium 2 Blower Motor Control

E

BLK

1050

Ground

F

ORN

52

Blower Motor High Control

G

RED

542

Battery Positive Voltage

Blower Motor Resistor Assembly - Auxiliary - C1


Object Number: 68737 Size: CH

Connector Part Information
    • 12129489
    • 3-Way F Metri-Pack 280 Series Flexlock (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

1926

Auxiliary Blower Motor Low Control

B

RED

1925

Auxiliary Blower Motor Medium Control

C

WHT

1924

Auxiliary Blower Motor High Control

Blower Motor Resistor Assembly - Auxiliary - C2


Object Number: 62450 Size: CH

Connector Part Information
    • 12052856
    • 4-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1450

Ground

B

ORN

1740

Battery Positive Voltage

C

BRN

541

Ignition 3 Voltage (w/Heat and A/C)

BRN

541

Ignition 3 Voltage (w/Heat and A/C)

--

--

Not Used (w/ A/C)

D

BRN

541

Ignition 3 Voltage

Blower Motor - Auxiliary


Object Number: 62488 Size: CH

Connector Part Information
    • 12084957
    • 2-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

RED

65

Blower Motor Supply Voltage

B

BLK

1050

Ground

HVAC Control Module - C1


Object Number: 130690 Size: CH

Connector Part Information
    • 12110206
    • 24-Way F Micro-Pack 100 (LT BLU)

Pin

Wire Color

Circuit No.

Function

A1

DK GRN

1614

Recirculation Door Control

A2

DK BLU

1646

Right Air Temperature Door Position Signal

A3

LT BLU

733

Left Air Temperature Door Position Signal

A4

--

--

Not Used

A5

LT GRN

2275

Mode Door Position Signal

A6

--

--

Not Used

A7

BRN/WHT

230

Instrument Panel Lamps Dimming Control

A8

BLK

1851

Ground

A9-A10

--

--

Not Used

A11

DK GRN

71

OFF Blower Motor Control

A12

DK BLU

204

A/C Low Pressure Sensor Signal

B1

WHT/BLK

1236

Right Air Temperature Door Control

B2

DK BLU

1199

Left Air Temperature Door Control

B3

--

--

Not Used

B4

TAN

2273

Mode Door Control

B5

BRN

341

Ignition 3 Voltage

B6

YEL

1791

Low Reference

B7

ORN

4340

Battery Positive Voltage

B8

LT BLU/

BLK

1688

5 Volt Reference

B9

BLK

1050

Ground

B10

--

--

Not Used

B11

WHT

1038

HVAC Class 2 Serial Data

B12

--

--

Not Used

HVAC Control Module - C2


Object Number: 556473 Size: CH

Connector Part Information
    • 15326924
    • 8-Way F GT 280 (BLK)

Pin

Wire Color

Circuit Number

Function

A

PPL

73

Medium 3 Blower Motor Control

B

LT BLU

72

Medium 2 Blower Motor Control

C

TAN

63

Blower Motor Medium 1 Control

D

YEL

60

Blower Motor Low Control

E

--

--

Not Used

F

ORN

52

Blower Motor High Control

G

BRN

141

Ignition 3 Voltage

H

DK GRN

71

OFF Blower Motor Control

HVAC Control Assembly - Front Auxiliary - w/ A/C


Object Number: 73152 Size: CH

Connector Part Information
    • 12110259
    • 16-Way F Micro-Pack 100 Series (GRN)

Pin

Wire Color

Circuit No.

Function

A1

BRN/WHT

230

Instrument Panel Lamps Dimming Control

A2-A3

--

--

Not Used

A4

ORN

1923

Rear Auxiliary Enable Control

A5

WHT

1924

Auxiliary Blower Motor High Control

A6

RED

1925

Auxiliary Blower Motor Medium Control

A7

DK BLU

1926

Auxiliary Blower Motor Low Control

A8

BLK

1450

Ground

B1-B8

--

--

Not Used

HVAC Control Assembly - Rear Auxiliary - w/ A/C


Object Number: 356307 Size: CH

Connector Part Information
    • 12092632
    • 16-Way F Micro-Pack 100 Series (RED)

Pin

Wire Color

Circuit No.

Function

A1

BRN/WHT

230

Instrument Panel Lamps Dimming Control

A2-A4

--

--

Not Used

A5

WHT

1924

Auxiliary Blower Motor High Control

A6

RED

1925

Auxiliary Blower Motor Medium Control

A7

DK BLU

1926

Auxiliary Blower Motor Low Control

A8

BLK

1450

Ground

B1

BRN/WHT

230

Instrument Panel Lamps Dimming Control

B2-B3

--

--

Not Used

B4

ORN

1923

Rear Auxiliary Enable Control

B5

WHT

1924

Auxiliary Blower Motor High Control

B6

RED

1925

Auxiliary Blower Motor Medium Control

B7

DK BLU

1926

Auxiliary Blower Motor Low Control

B8

BLK

1450

Ground

HVAC Control Assembly - Front Auxiliary - w/ Heat and A/C


Object Number: 73152 Size: CH

Connector Part Information
    • 12084945
    • 16-Way F Micro-Pack 100 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A1

BRN/WHT

230

Instrument Panel Lamps Dimming Control

A2

--

--

Not Used

A3

LT BLU

733

Auxiliary Front Mode 1 Signal

A4

ORN

1923

Rear Auxiliary Enable Control

A5

WHT

1924

Auxiliary Blower Motor High Control

A6

RED

1925

Auxiliary Blower Motor Medium Control

A7

DK BLU

1926

Auxiliary Blower Motor Low Control

A8

BLK

1450

Ground

B1

--

--

Not Used

B2

BRN

541

Ignition 3 Voltage

B3

RED/BLK

2822

Auxiliary Front Mode 1 Signal

B4-B8

--

--

Not Used

HVAC Control Assembly - Rear Auxiliary - w/ Heat and A/C


Object Number: 73152 Size: CH

Connector Part Information
    • 12092629
    • 16-Way F Micro-Pack 100 Series (BLU)

Pin

Wire Color

Circuit No.

Function

A1

BRN/WHT

230

Instrument Panel Lamps Dimming Control

A2

BRN

541

Ignition 3 Voltage

A3

BRN

2383

Auxiliary Rear Mode 2 Signal

A4

--

--

Not Used

A5

WHT

1924

Auxiliary Blower Motor High Control

A6

RED

1925

Auxiliary Blower Motor Medium Control

A7

DK BLU

1926

Auxiliary Blower Motor Low Control

A8

BLK

1450

Ground

B1

BRN/WHT

230

Instrument Panel Lamps Dimming Control

B2

BRN

541

Ignition 3 Voltage

B3

DK BLU

1646

Auxiliary Rear Air Temperature 2 Signal

B4

GRY

778

Auxiliary Blower Motor Speed Control

B5

WHT

1924

Auxiliary Blower Motor High Control

B6

RED

1925

Auxiliary Blower Motor Medium Control

B7

DK BLU

1926

Auxiliary Blower Motor Low Control

B8

BLK

1450

Ground

HVAC Control Processor - Auxiliary


Object Number: 328486 Size: CH

Connector Part Information
    • 12040747
    • 12-Way P/C Edgeboard - STD (BLK)

Pin

Wire Color

Circuit No.

Function

A

RED/BLK

2822

Auxiliary Front Mode 1 Signal

B

WHT/BLK

1236

Auxiliary Air Temperature Door Control

C

DK BLU

1646

Auxiliary Rear Air Temperature 2 Signal

D

BRN

2823

Auxiliary Rear Mode 2 Signal

E

LT BLU

733

Auxiliary Front Mode 1 Signal

F

WHT

454

Auxiliary Mode Door Control

G

--

--

Not Used

H

BLK

1450

Ground

BLK

1450

Ground

J

BRN

541

Ignition 3 Voltage

BRN

541

Ignition 3 Voltage

K

--

--

Not Used

L

GRY

778

Auxiliary Blower Motor Speed Control

M

ORN

1923

Rear Auxiliary Enable Control

Mode Actuator


Object Number: 280764 Size: CH

Connector Part Information
    • 12064993
    • 6-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5

BRN

341

Ignition 3 Voltage

6

TAN

2273

Mode Door Control

7

YEL

1791

Low Reference

8

--

--

Not Used

9

LT GRN

2275

Mode Door Position Signal

10

LT BLU/

BLK

1688

5 Volt Reference

Recirculation Actuator


Object Number: 280764 Size: CH

Connector Part Information
    • 12064993
    • 6-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5

BRN

341

Ignition 3 Voltage

6

DK GRN

1614

Recirculation Door Control

7

BLK

1050

Ground

8-10

--

--

Not Used