GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2003 🢒 Ascender - 4WD 🢒 Body and Accessories 🢒 Wiring Systems 🢒 HVAC Connector End Views
Table 1: A/C Compressor Clutch Assembly
Table 2: A/C Low Pressure Switch
Table 3: A/C Refrigerant Pressure Sensor
Table 4: Air Temperature Actuator - Auxiliary
Table 5: Air Temperature Actuator - Left
Table 6: Air Temperature Actuator - Right
Table 7: Blower Motor
Table 8: Blower Motor - Auxiliary
Table 9: Blower Motor Control Processor - Auxiliary
Table 10: Blower Motor Fuse - Auxiliary
Table 11: Blower Motor Resistor Assembly
Table 12: Blower Motor Switch - Front Auxiliary
Table 13: Console Mode Actuator
Table 14: Coolant Bypass Valve
Table 15: Defrost Actuator
Table 16: HVAC Control Module C1
Table 17: HVAC Control Module C2
Table 18: HVAC Control Module - Auxiliary
Table 19: Mode Actuator
Table 20: Mode Actuator - Auxiliary
Table 21: Recirculation Actuator

A/C Compressor Clutch Assembly


Object Number: 684807 Size: CH

Connector Part Information
    • 12110293
    • 3-Way F Metri-Pack 150 Series Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

350

Ground

B

D-GN

59

A/C Compressor Clutch Supply Voltage

C

L-GN

2278

A/C Compressor Status Signal

A/C Low Pressure Switch


Object Number: 537107 Size: CH

Connector Part Information
    • 12052644
    • 2-Way F Metri-Pack 150 Series Sealed (GY)

Pin

Wire Color

Circuit No.

Function

A

D-BU

204

A/C Low Pressure Sensor Signal

B

BK

250

Ground

A/C Refrigerant Pressure Sensor


Object Number: 726824 Size: CH

Connector Part Information
    • 15344137
    • 3-Way F GT 150 Sealed 5.2 (BK)

Pin

Wire Color

Circuit No.

Function

1

BK

2751

Low Reference

2

GY

2700

5-Volt Reference

3

RD/BK

380

A/C Refrigerant Pressure Sensor Signal

Air Temperature Actuator - Auxiliary


Object Number: 258172 Size: CH

Connector Part Information
    • 12064982
    • 5-Way F Metri-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

1

GY

2598

Low Reference

2

D-BU

1199

Auxiliary Air Temperature Door Position Signal

3

GY/BK

598

5-Volt Reference

4

RD

2600

Auxiliary Actuator Door Control

5

YE

2214

Auxiliary Air Temperature Door Control

Air Temperature Actuator - Left


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6-Way F Micro-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

5

BN

341

Ignition 3 Voltage

6

D-BU

1199

Left Air Temperature Door Control

7

YE

1791

Low Reference

8

--

--

Not Used

9

L-BU

733

Left Air Temperature Door Position Signal

10

L-BU /BK

1688

5-Volt Reference

Air Temperature Actuator - Right


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6-Way F Micro-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

5

BN

341

Ignition 3 Voltage

6

WH/BK

1236

Right Air Temperature Door Control

7

YE

1791

Low Reference

8

--

--

Not Used

9

D-BU

1646

Right Air Temperature Door Position Signal

10

L-BU /BK

1688

5-Volt Reference

Blower Motor


Object Number: 62489 Size: CH

Connector Part Information
    • 12066681
    • 2-Way F Metri-Pack 630 Series, Sealed, Pull-to-Seat (BK)

Pin

Wire Color

Circuit No.

Function

A

PU

65

Blower Motor Supply Voltage

B

BK

850

Ground

Blower Motor - Auxiliary


Object Number: 695495 Size: CH

Connector Part Information
    • 15326870
    • 2-Way F GT 280 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

OG

840

Battery Positive Voltage

B

BK

250

Ground

Blower Motor Control Processor - Auxiliary


Object Number: 684908 Size: CH

Connector Part Information
    • 15326631
    • 4-Way F GT 280 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

1650

Ground

B

BK

250

Ground

C

GY

2604

Auxiliary Blower Motor Speed Control

D

OG

840

Battery Positive Voltage

Blower Motor Fuse - Auxiliary


Object Number: 350882 Size: CH

Connector Part Information
    • 12010105
    • Fuse Holder (BK)

Pin

Wire Color

Circuit No.

Function

A

OG

840

Battery Positive Voltage

B

OG

840

Battery Positive Voltage

OG

840

Battery Positive Voltage

Blower Motor Resistor Assembly


Object Number: 73146 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

TN

63

Medium 1 Blower Motor Control

B

YE

60

Low Blower Motor Control

C

PU

73

Medium 3 Blower Motor Control

D

L-BU

72

Medium 2 Blower Motor Control

E

BK

2250

Ground

F

OG

52

High Blower Motor Control

G

RD

542

Battery Positive Voltage

Blower Motor Switch - Front Auxiliary


Object Number: 333035 Size: CH

Connector Part Information
    • 12047781
    • 3-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

YE

2277

Auxiliary HVAC Enable Control

B

GY

2598

Low Reference

C

BN/WH

230

Instrument Panel Lamps Dimming Control

Console Mode Actuator


Object Number: 258172 Size: CH

Connector Part Information
    • 12064982
    • 5-Way F Micro-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

1

GY

2598

Low Reference

2

L-BU

5433

Console Mode Door Position Signal

3

GY

598

5-Volt Reference

4

GY

2599

Auxiliary Mode Door Control

5

L-GN

5434

Console Mode Door Control

Coolant Bypass Valve


Object Number: 635009 Size: CH

Connector Part Information
    • 12052641
    • 2-Way F Metri-Pack 150 Series Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

GY/BK

1596

Coolant Bypass Solenoid Control

B

BK

250

Ground

Defrost Actuator


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6-Way F Micro-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

5

BN

341

Ignition 3 Voltage

6

TN/BK

2274

Defrost Door Control

7

YE

1791

Low Reference

8

--

--

Not Used

9

L-GN /BK

2276

Defrost Door Position Signal

10

L-BU/BK

1688

5-Volt Reference

HVAC Control Module C1


Object Number: 130690 Size: CH

Connector Part Information
    • 12110206
    • 24-Way F Micro-Pack 100 Series (L-BU)

Pin

Wire Color

Circuit No.

Function

A1

D-GN

1614

Recirculation Door Control

A2

D-BU

1646

Right Air Temperature Door Position Signal

A3

L-BU

733

Left Air Temperature Door Position Signal

A4

L-GN/BK

2276

Defrost Door Position Signal

A5

L-GN

2275

Mode Door Position Signal

A6

--

--

Not Used

A7

BN/WH

230

Instrument Panel Lamps Dimming Control

A8

BK/WH

751

Ground

A9

GY/BK

1596

Coolant Bypass Solenoid Control

A10

YE

2277

Auxiliary HVAC Enable Control

A11

D-GN

71

OFF Blower Motor Control

A12

D-BU

204

A/C Low Pressure Sensor Signal

B1

WH/BK

1236

Right Air Temperature Door Control

B2

D-BU

1199

Left Air Temperature Door Control

B3

TN/BK

2274

Defrost Door Control

B4

TN

2273

Mode Door Control

B5

BN

341

Ignition 3 Voltage

B6

YE

1791

Low Reference

B7

OG

4340

Battery Positive Voltage

B8

L-BU/BK

1688

5-Volt Reference

B9

BK

2250

Ground

B10

--

--

Not Used

B11

WH

1038

HVAC Class 2 Serial Data

B12

L-GN

2278

A/C Compressor Status Signal

HVAC Control Module C2


Object Number: 556473 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

PU

73

Medium 3 Blower Motor Control

B

L-BU

72

Medium 2 Blower Motor Control

C

TN

63

Medium 1 Blower Motor Control

D

YE

60

Low Blower Motor Control

E

--

--

Not Used

F

OG

52

High Blower Motor Control

G

BN

141

Ignition 3 Voltage

H

D-GN

71

OFF Blower Motor Control

HVAC Control Module - Auxiliary


Object Number: 73156 Size: CH

Connector Part Information
    • 12110088
    • 24-Way F Micro-Pack 100 Series Sealed (GY)

Pin

Wire Color

Circuit No.

Function

A1

BN/WH

230

Instrument Panel Lamps Dimming Control

A2

OG

4340

Battery Positive Voltage

A3

GY

2603

TXV Solenoid Control

A4

GY

2599

Auxiliary Mode Door Control

A5

RD

2600

Auxiliary Actuator Door Control

A6

YE

2277

Auxiliary HVAC Enable Control

A7

D-BU

1199

Auxiliary Air Temperature Door Position Signal

A8

L-BU

5433

Console Mode Door Position Signal

A9

GY

598

5-Volt Reference

A10

--

--

Not Used

A11

GY

2289

Rear HVAC/Audio Class 2 Serial Data

A12

--

--

Not Used

B1

BK

2250

Ground

B2

GY

2598

Low Reference

B3

YE

2214

Auxiliary Air Temperature Door Control

B4

L-GN

5434

Console Mode Door Control

B5

BN/WH

2601

Auxiliary Mode Door Position Signal

B6-B11

--

--

Not Used

B12

GY

2604

Auxiliary Blower Motor Speed Control

Mode Actuator


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6-Way F Micro-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

5

BN

341

Ignition 3 Voltage

6

TN

2273

Mode Door Control

7

YE

1791

Low Reference

8

--

--

Not Used

9

L-GN

2275

Mode Door Position Signal

10

L-BU/BK

1688

5-Volt Reference

Mode Actuator - Auxiliary


Object Number: 258172 Size: CH

Connector Part Information
    • 12064982
    • 5-Way F Metri-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

1

GY

2598

Low Reference

2

BN/WH

2601

Auxiliary Mode Door Position Signal

3

GY/BK

598

5-Volt Reference

4

RD

2600

Auxiliary Actuator Door Control

5

GY/WH

2599

Auxiliary Mode Door Control

Recirculation Actuator


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6-Way F Micro-Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

5

BN

341

Ignition 3 Voltage

6

D-GN

1614

Recirculation Door Control

7

BK

2250

Ground

8-10

--

--

Not Used