GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Isuzu 🢒 2004 🢒 Ascender - 4WD 🢒 HVAC 🢒 HVAC Systems - Automatic 🢒 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 (Long Wheelbase)
Table 5: Air Temperature Actuator - Left
Table 6: Air Temperature Actuator - Right
Table 7: Air Temperature Sensor - Lower Left
Table 8: Air Temperature Sensor - Lower Right
Table 9: Air Temperature Sensor - Upper Left
Table 10: Air Temperature Sensor - Upper Right
Table 11: Air Temperature Sensor Assembly - Inside
Table 12: Ambient Air Temperature Sensor
Table 13: Ambient Light/Sunload Sensor Assembly
Table 14: Blower Motor
Table 15: Blower Motor - Auxiliary (Long Wheelbase)
Table 16: Blower Motor - Auxiliary (Short Wheelbase)
Table 17: Blower Motor Control Module
Table 18: Blower Motor Control Processor - Auxiliary (Long Wheelbase)
Table 19: Blower Motor Fuse - Auxiliary (Long Wheelbase)
Table 20: Blower Motor Switch - Front Auxiliary (Long Wheelbase)
Table 21: Console Mode Actuator - Auxiliary (Short Wheelbase)
Table 22: Console Mode Actuator - Auxiliary (Long Wheelbase)
Table 23: Coolant Bypass Valve (Long Wheelbase)
Table 24: Defrost Actuator
Table 25: Fan/Temperature Switch
Table 26: HVAC Control Module C1
Table 27: HVAC Control Module C2
Table 28: HVAC Control Module - Auxiliary (Short Wheelbase)
Table 29: HVAC Control Module - Auxiliary (Long Wheelbase)
Table 30: Mode Actuator
Table 31: Mode Actuator - Auxiliary (Long Wheelbase)
Table 32: 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 (Long Wheelbase)


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/RD

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

Air Temperature Sensor - Lower Left


Object Number: 82383 Size: CH

Connector Part Information
    • 12052642
    • 2-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BN

718

Low Reference

B

WH/BK

2339

Lower Left Air Temperature Sensor Signal

Air Temperature Sensor - Lower Right


Object Number: 82383 Size: CH

Connector Part Information
    • 12052642
    • 2-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BN

718

Low Reference

B

GY/BK

2337

Lower Right Air Temperature Sensor Signal

Air Temperature Sensor - Upper Left


Object Number: 82383 Size: CH

Connector Part Information
    • 12052642
    • 2-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BN

718

Low Reference

B

WH

2338

Upper Left Air Temperature Sensor Signal

Air Temperature Sensor - Upper Right


Object Number: 82383 Size: CH

Connector Part Information
    • 12052642
    • 2-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BN

718

Low Reference

B

GY

2336

Upper Right Air Temperature Sensor Signal

Air Temperature Sensor Assembly - Inside


Object Number: 39661 Size: CH

Connector Part Information
    • 12047786
    • 4-Way M Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

D-GN

734

Inside Air Temperature Sensor Signal

B

WH/BK

1236

Inside Air Temperature Sensor Assembly Control

C

BK

1350

Ground

D

BN

718

Low Reference

Ambient Air Temperature Sensor


Object Number: 684793 Size: CH

Connector Part Information
    • 12052642
    • 2-Way F Metri-Pack 150 Series Sealed (L-GN)

Pin

Wire Color

Circuit No.

Function

A

L-GN/BK

735

Ambient Air Temperature Sensor Signal

B

BN

718

Low Reference

Ambient Light/Sunload Sensor Assembly


Object Number: 130637 Size: CH

Connector Part Information
    • 12064760
    • 4-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

L-BU/BK

2519

Left Sunload Sensor Signal

B

GY

2521

Right Sunload Sensor Signal

C

BK

279

Ambient Light Sensor Low Reference

D

WH

278

Ambient Light Sensor Signal

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 (Long Wheelbase)


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 - Auxiliary (Short Wheelbase)


Object Number: 646420 Size: CH

Connector Part Information
    • 15332135
    • 4-Way F GT 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

D-GN

2347

Auxiliary Blower Motor High Speed Control

B

D-BU

2348

Auxiliary Blower Motor Medium Speed Control

C

BK

2250

Ground

D

--

--

Not Used

Blower Motor Control Module


Object Number: 68737 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

RD

542

Battery Positive Voltage

B

PU/WH

760

Blower Motor Speed Control

C

BK

2250

Ground

Blower Motor Control Processor - Auxiliary (Long Wheelbase)


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 (Long Wheelbase)


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 Switch - Front Auxiliary (Long Wheelbase)


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 - Auxiliary (Short Wheelbase)


Object Number: 258172 Size: CH

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

Pin

Wire Color

Circuit No.

Function

1

BN

341

Ignition 3 Voltage

2

WH

119

Auxiliary Mode Door Control

3

BK

2250

Ground

4-5

--

--

Not Used

Console Mode Actuator - Auxiliary (Long Wheelbase)


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

D-BU

5433

Console Mode Door Position Signal

3

GY

598

5-Volt Reference

4

GY

2599

Auxiliary Mode Door Control

5

D-GN

5434

Console Mode Door Control

Coolant Bypass Valve (Long Wheelbase)


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

Fan/Temperature Switch


Object Number: 605511 Size: CH

Connector Part Information
    • 50-57-9405
    • 5-Way F (BK)

Pin

Wire Color

Circuit Number

Function

1

L-GN

1011

Remote Radio Control Signal

2

BN

230

Instrument Panel Lamps Dimming Control

3

BK

2250

Ground

4

--

--

Not Used

5

L-GN

1011

Remote Radio Control Signal

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 (Long Wheelbase)

A10-A11

--

--

Not Used

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

Class 2 Serial Data

B12

L-GN

2278

A/C Compressor Status Signal

HVAC Control Module C2


Object Number: 684939 Size: CH

Connector Part Information
    • 15336594
    • 12-Way F Micro Pack 100 (L-GY)

Pin

Wire Color

Circuit No.

Function

A

D-GN

734

Inside Air Temperature Sensor Signal

B

L-GN/BK

735

Ambient Air Temperature Sensor Signal

C

WH

2338

Upper Left Air Temperature Sensor Signal

D

GY

2336

Upper Right Air Temperature Sensor Signal

E

WH/BK

2339

Lower Left Air Temperature Sensor Signal

F

GY/BK

2337

Lower Right Air Temperature Sensor Signal

G

PU

1838

Recirculation Door Position Signal

H-J

--

--

Not Used

K

BN

718

Low Reference

L

WH/BK

1236

Inside Air Temperature Sensor Control

M

PU/WH

760

Blower Motor Speed Control

HVAC Control Module - Auxiliary (Short Wheelbase)


Object Number: 744295 Size: CH

Connector Part Information
    • 12084944
    • 16-Way F Micro Pack 100 Series (BK)

Pin

Wire Color

Circuit No.

Function

A1

OG

4340

Battery Positive Voltage

A2

GY

2289

Rear HVAC/Audio Class 2 Serial Data

A3

--

--

Not Used

A4

BK

2250

Ground

A5

BN/WH

230

Instrument Panel Lamps Dimming Control

A6

WH

119

Auxiliary Mode Door Control

A7

D-GN

2347

Auxiliary Blower Motor High Speed Control

A8

D-BL

2348

Auxiliary Blower Motor Medium Speed Control

B1

BN

199

Left Rear Speaker Output (+)

B2

D-BL

46

Right Rear Speaker Output (+)

B3

BN

599

Left Rear Low Level Audio Signal (+)

B4

D-BL

546

Right Rear Low Level Audio Signal (+)

B5

YE

116

Left Rear Speaker Output (-)

B6

L-BU

115

Right Rear Speaker Output (-)

B7

BN

1547

Left Rear Low Level Audio Signal (-)

B8

BK

1946

Right Rear Low Level Audio Signal (-)

HVAC Control Module - Auxiliary (Long Wheelbase)


Object Number: 258912 Size: CH

Connector Part Information
    • 12110113
    • 32-Way F Micro-Pack 100 Series Sealed (RD)

Pin

Wire Color

Circuit No.

Function

A1

BN

1547

Rear Low Level Audio Signal (-)

A2

BK

1946

Right Rear Low Level Audio Signal (-)

A3

YE

116

Left Rear Speaker Output (-)

A4

L-BU

115

Right Rear Speaker Output (-)

A5

BN

199

Left Rear Speaker Output (+)

A6

D-BU

46

Right Rear Speaker Output (+)

A7

BN

599

Left Rear Low Level Audio Signal (+)

A8

D-BU

546

Right Rear Low Level Audio Signal (+)

A9

--

--

Not Used

A10

D-BU

5433

Console Mode Door Position Signal

A11

GY

2599

Auxiliary Mode Door Control

A12

YE

2214

Auxiliary Air Temperature Door Control

A13

GY

598

5-Volt Reference

A14

GY

2603

TXV Solenoid Control

A15

--

--

Not Used

A16

OG

4340

Battery Positive Voltage

B1

BN/WH

230

Instrument Panel Lamps Dimming Control

B2

GY

2289

Rear HVAC/Audio Class 2 Serial Data

B3

--

--

Not Used

B4

GY

2604

Auxiliary Blower Motor Speed Control

B5-B9

--

--

Not Used

B10

BN/WH

2601

Auxiliary Mode Door Position Signal

B11

YE

2277

Auxiliary HVAC Enable Control

B12

D-BU

1199

Auxiliary Air Temperature Door Position Signal

B13

D-GN

5434

Console Mode Door Control

B14

RD

2600

Auxiliary Actuator Door Control

B15

GY

2598

Low Reference

B16

BK

2250

Ground

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 (Long Wheelbase)


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/RD

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

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

YE

1791

Low Reference

8

--

--

Not Used

9

PU

1838

Recirculation Door Position Signal

10

L-BU/BK

1688

5-Volt Reference