GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2005 🢒 TopKick C-Series Commercial (Cutaway) C4/C5 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 HVAC Connector End Views
Table 1: A/C Compressor Clutch (C4/C5 w/C60)
Table 2: A/C Compressor Clutch (C6/C7/C8 w/C60)
Table 3: A/C Compressor Clutch Relay (C60)
Table 4: A/C High Pressure Switch (C60)
Table 5: A/C Low Pressure Switch (C60)
Table 6: Air Temperature Actuator
Table 7: Blower Motor - Auxiliary C1 (C36)
Table 8: Blower Motor - Auxiliary C2 (C36)
Table 9: Blower Motor (C40/C60)
Table 10: Blower Motor Relay - Auxiliary (C36)
Table 11: Blower Motor Resistor - Auxiliary (C36)
Table 12: Blower Motor Resistor Assembly (C40/C60)
Table 13: Coolant Bypass Valve Solenoid (C36)
Table 14: HVAC Control Assembly C1 (C40/C60)
Table 15: HVAC Control Assembly C2 (C40/C60)
Table 16: HVAC Control Assembly C3 (C49)
Table 17: HVAC Control Assembly - Auxiliary (C36)
Table 18: Vacuum Pump (w/o L18)

A/C Compressor Clutch (C4/C5 w/C60)


Object Number: 684852 Size: CH

Connector Part Information
    • 12124823 Body
    • 12066601 Seal
    • 12162017 Assembly
    • 2-Way F Metri-Pack 150 Series, Sealed (GY)

Pin

Wire Color

Circuit No.

Function

A

BK

250

Ground

B

D-GN

59

A/C Compressor Clutch Supply Voltage

A/C Compressor Clutch (C6/C7/C8 w/C60)


Object Number: 684795 Size: CH

Connector Part Information
    • 12052637 Body
    • 12103067 Seal
    • 12052643 Assembly
    • 2-Way F Metri-Pack 150 Series, Sealed (RD)

Pin

Wire Color

Circuit No.

Function

A

BK

250

Ground

B

D-GN

59

A/C Compressor Clutch Supply Voltage

A/C Compressor Clutch Relay (C60)


Object Number: 535912 Size: CH

Connector Part Information
    • 12110780 Body
    • 12065663 Seal
    • 12129716 Assembly
    • 4-Way F Metri-Pack 280 Series, Flexlock, Sealed (GY)

Pin

Wire Color

Circuit No.

Function

30

OG

1240

Battery Positive Voltage

85

D-GN

603

A/C Low Pressure Switch Signal (LG4/LG5)

D-GN/WH

459

A/C Compressor Clutch Relay Control (L18/LLY)

86

D-GN/WH

459

A/C Compressor Clutch Relay Control (LG4/LG5)

BN

441

Ignition 3 Voltage (L18/LLY)

87

D-GN

59

A/C Compressor Clutch Supply Voltage

A/C High Pressure Switch (C60)


Object Number: 874942 Size: CH

Connector Part Information
    • 12162434 Body
    • 12059639 Seal
    • 12162443 Assembly
    • 2-Way F Metri-Pack 150 Series, Pull To Seat, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

D-GN/WH

762

A/C Request Signal (L18/LLY)

L-GN

66

A/C Request Signal (LG4/LG5)

B

L-GN

66

A/C Request Signal (L18/LLY)

D-GN/WH

459

A/C Compressor Clutch Relay Control (LG4/LG5)

A/C Low Pressure Switch (C60)


Object Number: 537107 Size: CH

Connector Part Information
    • 12052638 Body
    • 12103067 Seal
    • 12052644 Assembly
    • 2-Way F Metri-Pack 150 Series, Sealed (L-GY)

Pin

Wire Color

Circuit No.

Function

A

BK

250

Ground (L18/LLY)

D-GN

603

A/C Low Pressure Switch Signal (LG4/LG5)

B

D-GN

603

A/C Low Pressure Switch Signal (L18/LLY)

BK

250

Ground (LG4/LG5)

Air Temperature Actuator


Object Number: 281207 Size: CH

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

Pin

Wire Color

Circuit No.

Function

5-6

--

--

Not Used

7

BK

450

Ground

8

L-BU

733

Left Air Temperature Door Control

9

--

--

Not Used

10

BN

141

Ignition 3 Voltage

Blower Motor - Auxiliary C1 (C36)


Object Number: 874943 Size: CH

Connector Part Information
    • 12040673
    • 1-Way F Metri-Pack 800 Series, Inset Molded (BK)

Pin

Wire Color

Circuit No.

Function

A

YE

1172

Auxiliary Blower Motor Supply Voltage

Blower Motor - Auxiliary C2 (C36)


Object Number: 35348 Size: CH

Connector Part Information
    • 12004267
    • 1-Way F 56 Series Lock Type (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

550

Ground

Blower Motor (C40/C60)


Object Number: 62488 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

PU

65

Blower Motor Supply Voltage

B

BK

450

Ground

Blower Motor Relay - Auxiliary (C36)


Object Number: 535912 Size: CH

Connector Part Information
    • 12110780 Body
    • 12065663 Seal
    • 12129716 Assembly
    • 4-Way F Metri-Pack 280 Series, Flexlock, Sealed (GY)

Pin

Wire Color

Circuit No.

Function

30

OG

540

Battery Positive Voltage

85

BK

550

Ground

86

BN

141

Ignition 3 Voltage

87

OG

1923

Auxiliary HVAC Switch Supply Voltage

Blower Motor Resistor - Auxiliary (C36)


Object Number: 284534 Size: CH

Connector Part Information
    • 12077384
    • 3-Way F 56 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

RD

1925

Auxiliary Blower Motor Medium Speed Control

B

YE

1172

Auxiliary Blower Motor Supply Voltage

WH

1924

Auxiliary Blower Motor High Control

C

D-BU

1926

Auxiliary Blower Motor Low Speed Control

Blower Motor Resistor Assembly (C40/C60)


Object Number: 535914 Size: CH

Connector Part Information
    • 12160485 Body
    • 12059301 Seal
    • 12160746 Assembly
    • 6-Way F Metri-Pack 280 Series, Flexlock, Sealed (L-GY)

Pin

Wire Color

Circuit No.

Function

A

RD

542

Battery Positive Voltage

B

OG

52

Blower Motor High Control

C

BK

450

Ground

D

TN

63

Blower Motor Medium 1 Control

E

YE

60

Blower Motor Low Control

F

L-BU

72

Medium 2 Blower Motor Control

Coolant Bypass Valve Solenoid (C36)


Object Number: 635009 Size: CH

Connector Part Information
    • 12052635 Body
    • 12103067 Seal
    • 12052641 Assembly
    • 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

550

Ground

HVAC Control Assembly C1 (C40/C60)


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

WH

119

Mode Door Control

B

BK

450

Ground

C

GY

8

Instrument Panel Lamp Supply Voltage - 1

HVAC Control Assembly C2 (C40/C60)


Object Number: 62469 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

YE

60

Blower Motor Low Control

B

TN

63

Blower Motor Medium 1 Control

C

L-BU

72

Medium 2 Blower Motor Control

D

OG

52

Blower Motor High Control

E

BN

141

Ignition 3 Voltage

F

L-BU

733

Left Air Temperature Door Control

G

WH

119

Mode Door Control

H

L-GN

66

A/C Request Signal

HVAC Control Assembly C3 (C49)


Object Number: 62450 Size: CH

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

Pin

Wire Color

Circuit No.

Function

A

PU

1093

Rear Defog Element Supply Voltage

B

BN

141

Ignition 3 Voltage

C

BK

450

Ground

D

PU

293

Rear Defog Element Supply

HVAC Control Assembly - Auxiliary (C36)


Object Number: 284533 Size: CH

Connector Part Information
    • 12162066
    • 8-Way F Metri-Pack 280 Series (GY)

Pin

Wire Color

Circuit No.

Function

A

WH

1924

Auxiliary Blower Motor High Speed Control

B

RD

1925

Auxiliary Blower Motor Medium Speed Control

C

GY/BK

1596

Coolant Bypass Solenoid Control

D

--

--

Not Used

E

BK

550

Ground

F

D-BU

1926

Auxiliary Blower Motor Low Speed Control

G

OG

1923

Auxiliary HVAC Switch Supply Voltage

H

GY

8

Instrument Panel Lamp Supply Voltage - 1

Vacuum Pump (w/o L18)


Object Number: 635009 Size: CH

Connector Part Information
    • 12052635 Body
    • 12103067 Seal
    • 12052641 Assembly
    • 2-Way F Metri-Pack 150 Series, Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

350

Ground

B

BN

141

Ignition 3 Voltage