GM Service Manual Online
For 1990-2009 cars only
Table 1: A/C Compressor
Table 2: A/C Compressor High Pressure Cutout Switch
Table 3: A/C Compressor Low Pressure Cycling Switch (ALL)
Table 4: A/C Automatic Recirculating Switch
Table 5: A/C Air Temperature Sensor
Table 6: Rear A/C Air Temperature Sensor
Table 7: Heater Air Temperature Sensor
Table 8: Rear Heater Air Temperature Sensor (Suburban/Utility)
Table 9: Outside Ambient Air Temperature Sensor
Table 10: Sun Load Temperature Sensor
Table 11: Inside Air Temperature Sensor (Over Head )
Table 12: Blower Motor - Front/Rear
Table 13: Blower Motor Assembly (Front/Rear Module)
Table 14: HVAC Control Module - Front (Auto A/C)
Table 15: Rear Auxiliary HVAC Control- Front
Table 16: Rear Auxiliary HVAC Controls (Utilities)
Table 17: C-1 Rear Auxiliary A/C Heater Module/Harness Adapter (Utility)
Table 18: C-2 Rear Auxiliary A/C Heater Module/Harness Adapter (Utility)
Table 19: Mode Door Motor
Table 20: Mode Door Motor - Rear (Suburban)
Table 21: Recirculation Door Motor
Table 22: Auxiliary Recirculation Door Motor (Rear HVAC-Manual)
Table 23: Temperature Door Motor
Table 24: Auxiliary Temperature Door Motor (Rear HVAC-Manual )
Table 25: Temperature Door Motor (Uplevel / Auto A/C))
Table 26: Rear Temperature Door Motor (Suburban)

A/C Compressor


Object Number: 280759  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 Solenoid Feed

A/C Compressor High Pressure Cutout Switch


Object Number: 366093  Size: CH

Connector Part Information

    • 15317968
    • 2-Way F Micro-Pack 100 W Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

203

Air Conditioning Refrigerant High Pressure Cutout Switch

B

DK GRN/WHT

762

Air Conditioning Request Signal

A/C Compressor Low Pressure Cycling Switch (ALL)


Object Number: 35437  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

DK GRN

603

A/C Compressor Low Pressure Cycling Switch Output

B

BLK

550

Ground

A/C Automatic Recirculating Switch


Object Number: 35437  Size: CH

Connector Part Information

    • 12124037
    • 2-Way F Metri-Pack 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

604

A/C Automatic Recirculating Switch Output

B

BLK

150

Ground

A/C Air Temperature Sensor


Object Number: 82383  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

LT GRN

404

Discharge Air Temperature Sensor Signal - Upper

B

BRN

718

Sensor Return

Rear A/C Air Temperature Sensor


Object Number: 82383  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

TAN

517

Air Temperature Sensor Signal - Rear

B

BLK

808

Sensor Return

Heater Air Temperature Sensor


Object Number: 82383  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

LT GRN

405

Heater Air Temperature Sensor Signal

B

BRN

718

Heater Air Temperature Sensor Return

Rear Heater Air Temperature Sensor (Suburban/Utility)


Object Number: 82383  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

BLK

520

Heater Air Temperature Sensor Signal - Rear

B

BLK

808

Sensor Return

Outside Ambient Air Temperature Sensor


Object Number: 35437  Size: CH

Connector Part Information

    • 12047661
    • 2-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN/BLK

735

Outside Ambient Temperature Sensor Signal

B

BRN

718

Outside Ambient Temperature Sensor Return

Sun Load Temperature Sensor


Object Number: 82383  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

LT BLU/BLK

590

Sun Load Temperature Sensor Signal

B

BRN

718

Sun Load Temperature Sensor Return

Inside Air Temperature Sensor (Over Head )


Object Number: 130635  Size: CH

Connector Part Information

    • 12045813
    • 4-Way F Metri-Pack 150 (NAT)

Pin

Wire Color

Circuit No.

Function

A

DK GRN

734

Inside Temperature Sensor Signal

B

PNK

39

Fused Ignition Positive Voltage

C

BLK

1850

Ground

D

BRN

718

Inside Temperature Sensor Return

Blower Motor - Front/Rear


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 Feed

B

BLK

1050

Ground

Blower Motor Assembly (Front/Rear Module)


Object Number: 68737  Size: CH

Connector Part Information

    • 12129489
    • 3-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1050

Ground

A

BLK

1450

Ground (Suburban)

B

GRY/BLK

754

Blower Speed Signal - Control (Front)

B

PPL

374

Blower Speed Signal - Control (Rear-Suburban)

C

ORN

540

Fused Battery Positive Voltage

C

ORN

1740

Fused Battery Positive Voltage (Suburban)

HVAC Control Module - Front (Auto A/C)


Object Number: 73157  Size: CH

Connector Part Information

    • 12045575
    • 32-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

C1

LT BLU/BLK

590

Sun Load Sensor Input

C2

BRN

404

Discharge Air Temperature Sensor Signal -(Upper)

C3

LT GRN

405

Discharge Air Temperature Sensor Signal -(Lower)

C4

LT BLU

733

Air Temperature Valve Position Sensor Signal

C5

PPL

1838

Air Inlet Valve Position Sensor

C6

BRN

341

Fused Positive Ignition Voltage

C7

DK GRN

1614

Air Inlet Valve Motor Feed

C8

WHT

119

Mode Switch Output

C9

DK BLU

1199

Air Temperature Valve Motor Feed

C10

BLK

2450

Ground

C11

WHT

1038

SeriaData Signal - Class 2

C12

ORN

340

Fused Battery Positive Voltage

C13-C15

--

--

Not Used

C16

GRY/BLK

754

Blower Speed Signal - Speed Control

D1

DK GRN

734

Inside Air Temperature Sensor Input

D2

LT GRN/BLK

735

Outside Ambient Air Temperature Sensor Input

D3

RED

708

Mode Valve Position Sensor Signal - Upper

D4

--

--

Not Used

D5

GRY

598

5 Volt Reference

D6

--

--

Not Used

D7

GRY

8

Instrument Panel Lamp Feed

D8

LT BLU

203

A/C Conditioning Refridgerant High Pressure Cut-Out Switch Feed

D9

BRN

718

Sensor Return

D10

GRY/BLK

1798

Return

D11

LT BLU

2820

KDD Clock

D12

RED

2819

KDD Data

D13

--

--

Not Used

D14

WHT

193

Rear Defogger Relay Control - Coil

D15-D16

--

--

Not Used

Rear Auxiliary HVAC Control- Front


Object Number: 73152  Size: CH

Connector Part Information

    • 12084944
    • 16-Way Female Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

GRY

2821

Voltage Reference

A3 -A4

--

--

Not Used

A5

BLK

1050

Ground

A6 - A7

--

--

Not Used

A8

GRY

8

Instrument Panel Lamp Feed

B1

BLK

2930

Feedback Temperature

B2

--

--

Not Used

B3

WHT

454

Mode Switch Output

B4-B5

--

--

Not Used

B6

BLK/WHT

2933

Ground

B7

--

--

Not Used

B8

PPL/WHT

760

Blower Speed Signal- Speed Control

Rear Auxiliary HVAC Controls (Utilities)


Object Number: 73156  Size: CH

Connector Part Information

    • 12110088
    • 24-Way F Micro-Pack 100 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A1

--

--

Not Used

A2

PPL

374

Blower Motor Output- Speed Signal

A3

WHT/BLK

1236

Air Temperature Valve Motor Feed

A4

WHT

454

Mode Switch Output

A5

--

--

Not Used

A6

TAN

517

Air Temperature Sensor Signal - A/C Rear

A7

BLK

520

Air Temperature Sensor Signal - Heater Rear

A8

BLK

1450

Ground

A9

BLK

1050

Ground

A10

BLK

808

Sensor Return

A11

BLK

2930

Feedback Temperature

A12

PPL/WHT

760

Blower Speed Signal - Speed Control

B1

BRN

541

Fused Ignition Positive Voltage

B2

GRY

8

Instrument Panel Lamp Feed

B3

GRY

8

Instrument Panel Lamp Feed

B4

DK BLU

1646

Air Temperature Valve Position Sensor Signal

B5

YEL/BLK

1814

Mode Valve Position Sensor Signal

B6

GRY

598

5 Volt Reference Feed

B7

GRY

2821

Voltage Reference

B8

LT BLU

2820

KDD Clock

B9

LT BLU

2819

KDD Data

B10

GRY/BLK

1798

Return

B11

BLK/WHT

2933

Ground

B12

WHT

454

Mode Switch Output

C-1 Rear Auxiliary A/C Heater Module/Harness Adapter (Utility)


Object Number: 62455  Size: CF

Connector Part Information

    • 12064752
    • 6 - Way F Metri-Pack 280 Series (BLK)

Connector Part Information

    • 12064754
    • 6 - Way M Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

Pin

Wire Color

Circuit No.

Function

A

ORN

1740

Fused Battery Positive Voltage

A

ORN

1740

Fused Battery Positive Voltage

B

BRN

541

Low Reference

B

BRN

541

Low Reference

C

GRY

8

Instrument Panel Lamp Supply Voltage - 1

C

GRY

8

Instrument Panel Lamp Supply Voltage - 1

D

--

--

Not Used

D

--

--

Not Used

E

RED

2819

Driver HVAC Control Assembly Signal

E

RED

2819

Driver HVAC Control Assembly Signal

F

LT BLU

2820

Driver HVAC Control Assembly Clock Signal

F

LT BLU

LT BLU

Driver HVAC Control Assembly Clock Signal

C-2 Rear Auxiliary A/C Heater Module/Harness Adapter (Utility)


Object Number: 289409  Size: CF

Connector Part Information

    • 15304692
    • 18 - Way F GT 280 Series (BLK)

Connector Part Information

    • 15305201
    • 18 - Way M 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

Pin

Wire Color

Circuit No.

Function

A1 -A3

--

--

Not Used

A1-A3

--

--

Not Used

A4

GRY/BLK

1798

Return

A4

GRY/BLK

1798

Return

A5 -A8

--

--

Not Used

A5 -A8

--

--

Not Used

A9

PPL

374

Blower Motor Speed Signal - Output

A9

PPL

374

Blower Motor Speed Signal - Output

B1

DRK/BLU

1646

Air Temperature Valve Position Sensor Signal - Passenger

B1

DRK/BLU

1646

Air Temperature Valve Position Sensor Signal - Passenger

B2

WHT/BLK

1236

Air Temperature Valve Motor Feed - Passeger

B2

GRY

598

Reference Voltage Feed - 5 Volt

B3

YEL/BLK

1814

Mode Valve Position Sensor Signal - Lower

B3

YEL/BLK

1814

Mode Valve Position Sensor Signal - Lower

B4

--

--

Not Used

B4

--

--

Not Used

B5

BRN

541

Fused Ignition Positive Voltage

B5

BRN

541

Fused Ignition Positive Voltage

B6

GRY

598

Reference Voltage Feed - 5 Volt

B6

GRY

598

Reference Voltage Feed - 5 Volt

B7 -B8

--

--

Not Used

B7 -B8

--

--

Not Used

B9

WHT

454

Mode Switch Output

B9

WHT

454

Mode Switch Output

Mode Door Motor


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

Fused Ignition Positive Voltage

6

WHT

119

Mode Switch Output

7

BLK

2450

Ground

7

GRY/BLK

1798

Return (Auto A/C)

8

--

--

Not Used

9

RED

708

Mode Door Position Sensor Signal (Upper)

10

GRY

598

Reference Voltage Feed (5 Volt)

Mode Door Motor - Rear (Suburban)


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

541

Fused Ignition Positive Voltage

6

WHT

454

Mode Switch Output

7

GRY/BLK

1798

Return

8

--

--

Not Used

9

YEL/BLK

1814

Mode Valve Position Sensor Signal - Rear

10

GRY

598

Reference Voltage Feed (5 Volt)

Recirculation Door Motor


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

Fused Ignition Positive Voltage

6

DK GRN

1614

Air Inlet Valve Motor Feed

7

BLK

2450

Ground

7

GRY/BLK

1798

Return (Auto A/C)

8

--

--

Not Used

9

PPL

1838

Air Inlet Valve Position Sensor (Auto A/C)

10

GRY

598

Reference Voltage Feed - 5 Volt (Auto A/C)

Auxiliary Recirculation Door Motor (Rear HVAC-Manual)


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

454

Mode Switch Output

9

--

--

Not Used

10

BRN

541

Fused Ignition Positive Voltage

Temperature Door Motor


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

541

Fused Ignition Positive Voltage

6

DK BLU

1199

Temperature Door Motor (HVAC) Feed

7

BLK

2450

Ground

8

--

--

Not Used

9

LT BLU

733

Temperature Door Position Sensor Signal

10

GRY

598

Reference Voltage Feed (5 Volt)

Auxiliary Temperature Door Motor (Rear HVAC-Manual )


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

Air Temperature Valve Motor Feed-Passenger

9

--

--

Not Used

10

BRN

541

Fused Ignition Positive Voltage

Temperature Door Motor (Uplevel / Auto A/C))


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

Fused Ignition Positive Voltage

6

WHT

119

Mode Switch Output

6

DK BLU

1119

Air Inlet Valve Motor Feed (Auto A/C)

7

BLK

2450

Ground

7

GRY/BLK

1798

Return (Auto A/C)

8

--

--

Not Used

9

RED

708

Mode Door Position Sensor Signal (Upper)

9

LT BLU

733

Air Temperature Valve Position Sensor Signal

10

GRY

598

Reference Voltage Feed (5 Volt)

Rear Temperature Door Motor (Suburban)


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

541

Fused Ignition Positive Voltage

6

WHT/BLK

1236

Air Temperature Valve Motor Feed - Rear

7

GRY/BLK

1798

Return

8

--

--

Not Used

9

DK BLU

1646

Air Temperature Valve Position Sensor Signal - Rear

10

GRY

598

Reference Voltage Feed - 5 Volt