GM Service Manual Online
For 1990-2009 cars only
Table 1: Air Temperature Valve Sensor and Motor
Table 2: Blower Motor
Table 3: Heater and A/C Control Module (Electronic Climate Control (EEC) Module)
Table 4: Inside Air Temperature Sensor
Table 5: HVAC Solenoid Assembly
Table 6: Lower Discharge Air Temperature Sensor
Table 7: Outside Ambient Temperature Sensor
Table 8: Sun Load Temperature Sensor
Table 9: Upper Discharge Air Temperature Sensor

Air Temperature Valve Sensor and 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

341

Fuse Output - Ignition

6

DK BLU

1199

Air Temperature Valve Motor Feed

7

YEL

1791

Air Temperature Valve Motor Return

9

LT BLU

733

Air Temperature Valve Position Sensor Signal

10

LT BLU/BLK

1688

Reference Voltage Feed - 5 Volt Reference

Blower Motor


Object Number: 73229  Size: CH

Connector Part Information

    • 12129565
    • 4-Way F Metri-Pack 280 Series, Sealed (MD GRY)

Pin

Wire Color

Circuit No.

Function

A

BLK

850

Ground

B

ORN

540

Fuse Output-Battey-Type III Fuse

C

760

PPL/WHT

Blower Speed Signal-Speed Control-Low Energy

D

--

--

Not Used

Heater and A/C Control Module (Electronic Climate Control (EEC) Module)


Object Number: 73157  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

Component Connector Cavity

DTC(s) Affected

Possible Symptoms From a Faulty Circuit

C1

LT BLU/BLK

590

Solar Sensor Input

Solar Sensor Terminal A

B0185

B0186

Degraded Temperature Control During High Sun Load

C2

BRN

404

Output Air Temperature (Upper) Input

Output Air Temperature (Upper) Terminal A

B0175

B0176

Failure Will Force Temp to Cold (Loss of Temp Control)

C3

LT GRN

405

Output Air Temperature (Lower) Input

Output Air Temperature (Lower) Terminal A

B0180

B0181

May Force Temp Hot or Cold (Degraded Temp Control)

C4

LT BLU

733

Elect Actuator ASM Position Feedback

Elect Actuator ASM Terminal 9

B0408

B0415

B0416

Degraded Temp Control

C5

--

--

Not Used

--

--

--

C6

BRN

341

IGN 3 Input (Hot in RUN Only)

IP Fuse Block Terminal G1

--

--

C7

GRY

1220

Dimming Input for Illumination

SP205

--

--

C8

--

--

Not Used

--

--

--

C9

DK BLU

1199

Elect Actuator ASM Position Direction Control

Elect Actuator ASM Terminal 6

B0409

Degraded Temp Control

C10

BLK

1050

Module Ground

SP204 Terminal K

--

System Inoperative

C11

WHT

1038

Class 2

SP201 Terminal L

--

Degraded Temp Control (Especially During Vehicle Warm-Up)

C12

ORN

340

Battery Input (Hot at All Times)

IP Fuse Block Terminal C1

--

System Inoperative

C13

LT BLU

706

Air Inlet Solenoid 5 (Low Side Driver)

Heater and A/C Solenoid Assembly Terminal 5

--

Degraded Mode Actuator Control

C14

TAN

363

Air Inlet Solenoid 3 (Low Side Driver)

Heater and A/C Solenoid Assembly Terminal 3

--

Degraded Mode Actuator Control

C15

PPL

361

Air Inlet Solenoid 1 (Low Side Driver)

Heater and A/C Solenoid Assembly

--

Degraded Mode Actuator Control (Defrost Performance)

C16

PPL/WHT

760

Blower Control Module ASM Speed Output

Blower Control Module ASM Terminal C

--

Loss of Blower Motor Control

D1

DK GRN

734

Inside Air Temperature Sensor Input

Inside Air Temperature Sensor Terminal A

B0165

B0166

Degraded Temp Control

D2

DK GRN/WHT

636

Ambient Air Temperature Sensor Input

Ambient Air Temperature Sensor Terminal B

B0160

B0161

Degraded Temp Control

D3-D4

--

--

Not Used

--

--

--

D5

LT BLU/BLK

1688

5 Volt Reference

Electric Actuator ASM Terminal 10

B0408

Degraded Temp Control

D6-D7

--

--

Not Used

--

--

--

D8

LT BLU

203

A/C Compressor Request (VCM)

A/C Compressor Switch Terminal A

--

Loss of A/C

D9

BLK

552

Sensor Ground

S280

--

Many DTCs Will Set

Degraded Temp Control

D10

YEL

1791

Electric Actuator ASM Ground

Electric Actuator ASM Terminal 7

B0408

Decreased Temp Control

D11-D13

--

--

Not Used

--

--

--

D14

WHT

193

Rear Defogger Relay (Low Side Driver)

underhood fuse block C1 Terminal F8

--

Loss of Rear Defogger Control

D15

LT GRN/BLK

366

Air Inlet Solenoid 4 (Low Side Driver)

Heater and A/C Solenoid Assembly Terminal 5

--

Degraded Mode Actuator Control

D16

RED

362

Air Inlet Solenoid 2 (Low Side Driver)

Heater and A/C Solenoid Assembly Terminal 2

--

Degraded Mode Actuator Control

NOTE: Refer to Typical Scan Tool Data Values for more information.

Inside Air Temperature Sensor


Object Number: 232132  Size: CH

Connector Part Information

    • 12020813
    • 5-Way F Metri-Pack 630 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A

ORN

52

Blower Switch Output - High

B

LT BLU

72

Blower Switch Output - Medium 2

C

TAN

63

Blower Switch Output - Medium 1

D

--

--

Not Used

E

BRN

64

High Speed Blower Relay Feed - Coil

HVAC Solenoid Assembly


Object Number: 40427  Size: CH

Connector Part Information

    • 12064978
    • 6-Way F Micro-Pack 100 Series (GRY)

Pin

Wire Color

Circuit No.

Function

1

PPL

361

Mode Valve Solenoid Output - Defrost

2

RED

362

Mode Valve Solenoid Output - Panel Vents

3

TAN

363

Mode Valve Solenoid Output - Upper

4

LT GRN/BLK

366

Mode Valve Solenoid Output - Lower

5

LT BLU

706

Mode Valve Solenoid Output - Recirculation

6

BRN

341

Fuse Output - Ignition 3 - Type III Fuse

Lower Discharge 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

Fuse Output - Battery

B

BLK

552

Sensor Return

Outside Ambient Temperature Sensor


Object Number: 35437  Size: CH

Connector Part Information

    • 12052641
    • 2-Way F Micro-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

552

Sensor Return

B

DK GRN/WHT

636

Outside Ambient Temperature Sensor Signal

Sun Load Temperature Sensor


Object Number: 82383  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

LT BLU/BLK

590

Solar Sensor Signal - Drive

B

BLK

552

Sensor Return

Upper Discharge 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

BRN

404

Fuse Output - Battery

B

BLK

552

Sensor Return