GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 GMC K Pickup - 4WD 🢒 Body and Accessories 🢒 Lighting Systems 🢒 HVAC Connector End Views
Table 1: A/C Compressor Clutch
Table 2: A/C Compressor Cycling Switch (Gas)
Table 3: A/C Compressor Cycling Switch (Diesel)
Table 4: A/C Compressor High Pressure Cutoff Switch (Gas)
Table 5: A/C Compressor High Pressure Cutoff Switch (Diesel)
Table 6: A/C Compressor Low Pressure Cutout Switch (Gas)
Table 7: A/C Compressor Low Pressure Cutout Switch (Diesel)
Table 8: Auxiliary Blower Motor
Table 9: Auxiliary Blower Motor Resistor
Table 10: Auxiliary Blower Motor Relay, Low
Table 11: Auxiliary Blower Motor Relay, Medium
Table 12: Auxiliary Blower Motor Relay, High
Table 13: Auxiliary HVAC Control Module, Front (w/A/C or Heat)
Table 14: Auxiliary HVAC Control Module, Rear (w/A/C or Heat)
Table 15: Auxiliary HVAC Control Module, Front (w/A/C and Heater, w/o Rear Controller)
Table 16: Auxiliary HVAC Control Module, Front (w/A/C and Heater, w/Rear Controller)
Table 17: Auxiliary HVAC Control Module, Rear (w/A/C and Heater, w/Rear Controller)
Table 18: Auxiliary HVAC Control Logic Module
Table 19: Auxiliary Mode Door Motor
Table 20: Auxiliary Temperature Door Motor
Table 21: Blower Motor C1, Front
Table 22: Blower Motor C2, Front
Table 23: Blower Motor Relay, High
Table 24: Blower Resistor
Table 25: HVAC Control Module, Connector C1
Table 26: HVAC Control Module, Connector C2
Table 27: HVAC Control Module, Connector C3
Table 28: Mode Door Motor
Table 29: Recirculation Door Motor
Table 30: Temperature Door Motor
Table 31: Water Valve (Suburban/Utility, Gas)

A/C Compressor Clutch


Object Number: 280759 Size: CH

Connector Part Information
    • 12162017
    • 2F M/P 150 (GRY)

Pin

Wire Color

Circuit No.

Function

A

BLK

150

Ground

B

DK GRN

59

Air Conditioning Compressor Clutch Solenoid Feed

A/C Compressor Cycling Switch (Gas)


Object Number: 38562 Size: CH

Connector Part Information
    • 12162440
    • 2F 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK GRN

603

Air Conditioning Refrigerant Low Pressure Cut-Out Switch Output

B

BLK/WHT

451

Ground

A/C Compressor Cycling Switch (Diesel)


Object Number: 38562 Size: CH

Connector Part Information
    • 12162440
    • 2F 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN

66

Air Conditioning Switch Ouput

B

DK GRN

603

Air Conditioning Refrigerant Low Pressure Cut-Out Switch Output

A/C Compressor High Pressure Cutoff Switch (Gas)


Object Number: 38560 Size: CH

Connector Part Information
    • 12162438
    • 2F M/P 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK GRN/WHT

762

Air Conditioning Request Signal

B

LT GRN

66

Air Conditioning Switch Output

A/C Compressor High Pressure Cutoff Switch (Diesel)


Object Number: 38560 Size: CH

Connector Part Information
    • 12162438
    • 2F M/P 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK GRN/WHT

762

Air Conditioning Request Signal

B

DK GRN

603

Air Conditioning Refrigerant Low Pressure Cut-Out Switch Output

A/C Compressor Low Pressure Cutout Switch (Gas)


Object Number: 35437 Size: CH

Connector Part Information
    • 12124037
    • 2F M/P 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK BLU

604

Air Conditioning Refrigerant High Pressure Cut-Out Switch Output

B

BLK/WHT

451

Ground

A/C Compressor Low Pressure Cutout Switch (Diesel)


Object Number: 35437 Size: CH

Connector Part Information
    • 12124037
    • 2F M/P 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

DK GRN

1614

Air Inlet Valve Motor Feed

B

BLK

150

Ground

Auxiliary Blower Motor


Object Number: 35456 Size: CH

Connector Part Information
    • 12129939
    • 2F Metri-Pack 630 (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

1172

Auxiliary Blower Motor Feed

B

BLK

150

Ground

Auxiliary Blower Motor Resistor


Object Number: 428533 Size: CH

Connector Part Information
    • 02977940
    • 3F 56 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

1072

Auxiliary Blower Resistor Output - Medium

B

YEL

1172

Auxiliary Blower Motor Feed

C

YEL

1176

Auxiliary Blower Motor Output - Low

Auxiliary Blower Motor Relay, Low


Object Number: 281199 Size: CH

Connector Part Information
    • 12034003
    • 5F M/P 630 (BLK)

Pin

Wire Color

Circuit No.

Function

1

RED

542

Fuse Output - Battery - Type II Fuse

2

DK BLU

1926

Auxiliary HVAC Switch Output - Low

3

--

--

Not Used

4

YEL

1176

Auxiliary Blower Motor Resistor Output - Low

5

BRN

341

Fuse Output - Ignition 3 Type III Fuse

Auxiliary Blower Motor Relay, Medium


Object Number: 281199 Size: CH

Connector Part Information
    • 12034003
    • 5F M/P 630 SPL (BLK)

Pin

Wire Color

Circuit No.

Function

1

RED

542

Fuse Output - Battery - Type II Fuse

2

RED

1925

Auxiliary HVAC Switch Output - Medium

3

--

--

Not Used

4

LT BLU

1072

Auxiliary Blower Motor Resistor Output - Medium

5

BRN

341

Fuse Output - Ignition 3 Type III Fuse

Auxiliary Blower Motor Relay, High


Object Number: 281199 Size: CH

Connector Part Information
    • 12034003
    • 5F M/P 630 SPL (BLK)

Pin

Wire Color

Circuit No.

Function

1

RED

542

Fuse Output - Battery - Type II Fuse

2

WHT

1924

Auxiliary HVAC Switch Output - High

3

--

--

Not Used

4

YEL

1172

Auxiliary Blower Motor Resistor Output - Medium

5

BRN

341

Fuse Output - Ignition 3 Type III Fuse

Auxiliary HVAC Control Module, Front (w/A/C or Heat)


Object Number: 62464 Size: CH

Connector Part Information
    • 12064769
    • 10F Metri-Pack 150 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A

GRY

8

IP Lamp Feed

B

BLK

150

Ground

C

DK BLU

1926

Auxiliary HVAC Switch Output - Low

D

WHT

1924

Auxiliary HVAC Switch Output - High

E

RED

1925

Auxiliary HVAC Switch Output - Medium

F

ORN

1923

Auxiliary HVAC Switch Feed

G-K

--

--

Not Used

Auxiliary HVAC Control Module, Rear (w/A/C or Heat)


Object Number: 62464 Size: CH

Connector Part Information
    • 12064769
    • 10F Metri-Pack 150 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A

GRY

8

IP Lamp Feed

B

BLK

150

Ground

C

DK BLU

1926

Auxiliary HVAC Switch Output -- Low

D

WHT

1924

Auxiliary HVAC Switch Output -- High

E

RED

1925

Auxiliary HVAC Switch Output -- Medium

F

ORN

1923

Auxiliary HVAC Switch Feed

G-K

-

-

Not Used

Auxiliary HVAC Control Module, Front (w/A/C and Heater, w/o Rear Controller)


Object Number: 73217 Size: CH

Connector Part Information
    • 12089906
    • 10F Metri-Pack 150 Series (BLU)

Pin

Wire Color

Circuit No.

Function

A

BRN

341

Ignition Feed - Fused

B

DK BLU

1926

Auxiliary HVAC Switch Output - Low

C

WHT

1924

Auxiliary HVAC Switch Output - High

D

RED

1925

Auxiliary HVAC Switch Output - Medium

E

BLK

150

Ground

F

DK BLU

1199

Air Temperature Valve Motor Feed

G

WHT

454

Mode Switch Output

H

GRY

8

IP Lamp Feed

Auxiliary HVAC Control Module, Front (w/A/C and Heater, w/Rear Controller)


Object Number: 62464 Size: CH

Connector Part Information
    • 12064871
    • 10F Metri-Pack 150 Series (BLU)

Pin

Wire Color

Circuit No.

Function

A

GRY

8

IP Lamp Feed

B

BLK

150

Ground

C

DK BLU

1926

Auxiliary HVAC Switch Output - Low

D

WHT

1924

Auxiliary HVAC Switch Output - High

E

RED

1925

Auxiliary HVAC Switch Output - Medium

F

ORN

1923

Auxiliary HVAC Switch Feed

G

BRN

341

Fuse Output-Ignition 3-Type III Fuse

H

LT BLU

733

Air Temperature Valve Position Sensor Signal

J

LT BLU

919

Front Control Heat Input

K

--

--

Not Used

Auxiliary HVAC Control Module, Rear (w/A/C and Heater, w/Rear Controller)


Object Number: 62464 Size: CH

Connector Part Information
    • 12064871
    • 10F Metri-Pack 150 Series (BLU)

Pin

Wire Color

Circuit No.

Function

A

GRY

8

IP Lamp Feed

B

BLK

150

Ground

C

DK BLU

1926

Auxiliary HVAC Switch Output - Low

D

WHT

1924

Auxiliary HVAC Switch Output - High

E

RED

1925

Auxiliary HVAC Switch Output - Medium

F

ORN

1923

Auxiliary HVAC Switch Feed

G

BRN

341

Fuse Output-Ignition 3-Type III Fuse

H

DK BLU

1646

Air Temperature Valve Position Sensor Signal-Passenger

J

LT BLU

920

Front Control Heat Output

K

--

--

Not Used

Auxiliary HVAC Control Logic Module


Object Number: 281192 Size: CH

Connector Part Information
    • 12047887
    • 12 Way Printed Circuit Edgeboard Series Standard (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

733

Air Temperature Door Position Signal

B

DK BLU

1199

Air Temperature Door Motor - Feed

C

DK BLU

1646

Air Temperature Door Position Signal - Rear

D

LT BLU

920

Rear Control Output

E

LT BLU

919

Front Control Heat Input

F

WHT

119

Mode Switch Output

G

--

--

Not Used

H

BLK

150

Ground

J

BRN

341

Ignition Fused Feed

K

--

--

Not Used

L

DK BLU

77

A/C Select Switch - Rear

M

ORN

1923

A/C Select Switch - Front

Auxiliary Mode Door Motor


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6F M/P 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5 -  6

--

--

Not Used

7

BLK

150

Ground

8

WHT

119

Mode Switch Output

9

--

--

Not Used

10

BRN

341

Fuse Output - Ignition 3 Type III Fuse

Auxiliary Temperature Door Motor


Object Number: 281207 Size: CH

Connector Part Information
    • 12040953
    • 6F M/P 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

5 - 6

--

--

Not Used

7

BLK

150

Ground

8

DK BLU

1199

Air Temperature Valve Motor Feed

9

--

--

Not Used

10

BRN

341

Fuse Output - Ignition 3 Type III Fuse

Blower Motor C1, Front


Object Number: 82430 Size: CH

Connector Part Information
    • 08905615
    • 1F 56 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

PPL

65

Power Motor Feed

Blower Motor C2, Front


Object Number: 82430 Size: CH

Connector Part Information
    • 08905615
    • 1F 56 Series (GRY)

Pin

Wire Color

Circuit No.

Function

A

BLK

150

Ground

Blower Motor Relay, High


Object Number: 281201 Size: CH

Connector Part Information
    • 12110541
    • 6F Metri-Pack 280 Series Flexlock (BLK)

Pin

Wire Color

Circuit No.

Function

A1

BLK

150

Ground

A2

RED

542

Fuse Output Battery - Type II Fuse

B1

--

--

Not Used

B2

DK BLU

101

Blower Resistor Output

C1

PPL

65

Blower Motor Feed

C2

ORN

52

Blower Switch Output - High

Blower Resistor


Object Number: 73208 Size: CH

Connector Part Information
    • 12064877
    • 4F Metri-Pack 680 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

60

Blower Switch Output - Low

B

DK BLU

101

Blower Resistor Output

C

TAN

63

Blower Switch Output - Medium 1

D

LT BLU

72

Blower Switch Output - Medium 2

HVAC Control Module, Connector C1


Object Number: 62450 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

ORN

1440

Battery Fused Feed Fuse Output - Battery -Type III Fuse

B

BRN

141

Ignition Fused Feed Fuse Output - Ignition 3 - Type III Fuse

C

BLK

150

Ground

D

PPL

293

Rear Defogger Element Feed

HVAC Control Module, Connector C2


Object Number: 62469 Size: CH

Connector Part Information
    • 12064998
    • 8 Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

72

Blower Switch Output - Medium 2

B

TAN

63

Blower Switch Output - Medium 1

C

YEL

60

Blower Switch Output - Low

D

DK GRN

71

A/C Select Switch Output

E -  F

--

--

Not Used

G

BRN

141

Fuse Output - Ignition 3-Type III Fuse

H

ORN

52

Blower Switch Output - High

HVAC Control Module, Connector C3


Object Number: 362756 Size: CH

Connector Part Information
    • 12191271
    • 10 Way P/C Bow Series (GRY)

Pin

Wire Color

Circuit No.

Function

1

GRY

8

Instrument Panel Lamp Feed

2

BLK

150

Ground

3

DK GRN

71

Blower Switch Output-Off

4

DK GRN

1614

Air Inlet Valve Motor Feed

5

BRN

141

Fuse Output-Ignition 3-Type III Fuse

6

--

--

Not Used

7

GRY/BLK

1596

Water Heater Control Solenoid Output (Suburban/4dr Utility, Gas)

8

LT BLU

733

Air Temperature Valve Position Sensor Signal

9

WHT

454

Mode Switch Output

10

LT GRN

66

A/C Switch Output

Mode Door Motor


Object Number: 281207 Size: CH

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

Pin

Wire Color

Circuit No.

Function

5 -  6

--

--

Not Used

7

BLK

150

Ground

8

WHT

454

Mode Switch Output

9

--

--

Not Used

10

BRN

141

Fuse Output - Ignition 3 Type III Fuse

Recirculation Door Motor


Object Number: 281207 Size: CH

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

Pin

Wire Color

Circuit No.

Function

5

BRN

141

Fuse Output - Ignition 3 Type III Fuse

6

DK GRN

1614

Air Inlet Valve Motor Feed

7

BLK

150

Ground

8 -  10

--

--

Not Used

Temperature Door Motor


Object Number: 281207 Size: CH

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

Pin

Wire Color

Circuit No.

Function

5 -  6

--

--

Not Used

7

BLK

150

Ground

8

LT BLU

733

Air Temperature Valve Position Sensor Signal

9

--

--

Not Used

10

BRN

141

Fuse Output Ignition 3 Type III Fuse

Water Valve (Suburban/Utility, Gas)


Object Number: 35437 Size: CH

Connector Part Information
    • 12052641
    • 2F M/P 150 (BLK)

Pin

Wire Color

Circuit No.

Function

A

GRY/BLK

1596

Heater Water Control Solenoid Output

B

BLK

150

Ground