GM Service Manual Online
For 1990-2009 cars only
Table 1: Automatic Transmission Shift Selector (MWF)
Table 2: Automatic Transmission Selector Control (MF1)
Table 3: Automatic Transmission (MWF)
Table 4: Automatic Transmission Upfitter Connector (MWF)
Table 5: Transmission Control Module C1 (MWF)
Table 6: Transmission Control Module C2 (MWF)
Table 7: Transmission Control Module C3 (MWF)

Automatic Transmission Shift Selector (MWF)


Object Number: 258240  Size: CH

Connector Part Information

    • 12160280
    • 20 Way F Metri-Pack 100 W Series, Sealed (GRY)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

63

Transmission Position Switch Signal Bit 1

B

YEL

64

Transmission Position Switch Signal Bit 2

C

GRY

65

Transmission Position Switch Signal Bit 3

D

GRN

66

Transmission Position Switch Signal Bit 4

E

WHT

67

Transmission Position Switch Signal Party Bit

F-L

--

--

Not Used

M

GRN

68

Transmission Shift Selector Mode Signal

N

GRY

69

Reference Voltage Feed 5 Volt Reference

P

BLK/WHT

70

Ground/Clean

R

ORN

71

Fuse Output Battery Type III Fuse

S

BLU

72

Transmission Shift Selector Display Signal

T

BLK

74

Ground

U

BLK/RED

73

Instrument Panel Feed

V

BLK

75

Ground

W

--

--

Not Used

Automatic Transmission Selector Control (MF1)


Object Number: 237082  Size: CH

Connector Part Information

6 Way F (BLK)

Pin

Wire Color

Circuit No.

Function

A

RED/GRN

41

Illumination

B

RED

37

Fuse Output Ignition

C

BLK/WHT

40

Transmission Park/Neutral Signal

D

BLK/RED

46

Interior Lamp Dimming Buss

E

RED/BLU

38

Select Lever Back Lamp

F

BLK/RED

39

Neutral Signal

Automatic Transmission (MWF)


Object Number: 216248  Size: CH

Connector Part Information

    • 29511365
    • 31 Way F (NAT)

Pin

Wire Color

Circuit No.

Function

1

ORN

1991

Shift Solenoid A Return

2

LT GRN

1527

Shift Solenoid C Feed

3

WHT

1532

Shift Solenoid G Feed

4

GRY

597

Reference Voltage Feed-5 Volt Reference

5

DK GRN

1531

Shift Solenoid F Feed

6

WHT

1994

Shift Solenoid F Output

7

RED

1525

Shift Solenoid A Feed

8

PPL

1992

Shift Solenoid B Return

9

WHT

1526

Shift Solenoid B Feed

10

PPL

1529

Shift Solenoid E Feed

11

YEL

1993

Shift Solenoid C Return

12

DK BLU

1528

Shift Solenoid D Feed

13

BLK

407

Sensor Return

14

YEL/BLK

1227

Transmission Temperature Sensor Signal

15-18

--

--

Not Used--Plugged

19

LT BLU

1984

Transmission Turbine Speed Switch Return

20

ORN

1983

Transmission Turbine Speed Switch Signal

21

RED/BLK

645

Sensor Return

22

RED

1226

Transmission Pressure Switch Signal-Bit 3

23

WHT

1971

Transmission Oil Level Sensor Signal

24-31

--

--

Not Used--Plugged

Automatic Transmission Upfitter Connector (MWF)


Object Number: 280766  Size: CH

Connector Part Information

    • 12065425
    • 10 Way F Metri-Pack 150 Series, Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

PPL

1146

Engine Brake Enable Signal

B

GRY

1148

Transmission Shift Inhibit Signal

C

PPL

420

Brake Pedal Switch Output-Torque Converter Clutch

D

RED/BLK

645

Sensor Return

E

YEL

1481

Transmission Auxiliary Hold Signal

F

LT BLU

1480

Transmission Power Take-Off Enable Signal

G

YEL

1479

Transmission Automatic Neutral Signal

H

TAN

1147

Transmission Shift Inhibit Signal

J

BLK

407

Sensor Return

K

DK BLU

1938

Engine Overspeed Indicator Lamp Output

Transmission Control Module C1 (MWF)


Object Number: 39787  Size: CH

Connector Part Information

    • 12129025
    • 32 Way F Micro-Pack 100 W Series, Sealed (NAT)

Pin

Wire Color

Circuit No.

Function

1

ORN

1840

Fuse Output-Battery-Type III Fuse

2

WHT

1454

Vehicle Interface Module Relay Feed-Coil-#1

3

PPL

1452

Vehicle Interface Module Relay Feed-Coil-#2

4

GRY

1524

Back-Up Lamp Feed-Monitored

5

DK BLU

1938

Engine Overspeed Indicator Lamp Output

6

PPL

1995

Transmission Park/Neutral Signal-Secondary

7-10

--

--

Not Used--Plugged

11

TAN

1147

Transmission Shift Inhibit Signal

12

YEL

1481

Transmission Auxiliary Hold Signal

13

LT BLU

1480

Transmission Power Takeoff Enable Signal

14-15

--

--

Not Used--Plugged

16

ORN

1840

Fuse Output-Battery-Type III Fuse

17

BLK/WHT

1251

Ground-Clean

18

--

--

Not Used--Plugged

19

GRY

1148

Transmission Shift Inhibit Signal

20

BRN

437

Vehicle Speed Sensor

21

--

--

Not Used--Plugged

22

ORN

1453

Vehicle Interface Module Relay Feed-Coil-#3

23-24

--

--

Not Used--Plugged

25

BLK

150

Ground

26

PNK

739

Fuse Output-Ignition 1-Type III Fuse

27

PNK

1905

Retarder Disable Output

27-28

--

--

Not Used--Plugged

29

PPL

420

Brake Pedal Switch Output-Torque Converter Clutch

30

YEL

1479

Transmission Automatic Neutral Signal

31

--

--

Not Used--Plugged

32

BLK/WHT

1251

Ground-Clean

Transmission Control Module C2 (MWF)


Object Number: 39787  Size: CH

Connector Part Information

    • 12129025
    • 32 Way F Micro-Pack 100 W Series, Sealed (NAT)

Pin

Wire Color

Circuit No.

Function

1

TAN/BLK

1921

Serial Data Link-A-SAE 1708

2

--

--

Not Used--Plugged

3

GRY

598

Reference Voltage Feed-5 Volt Reference

4

--

--

Not Used--Plugged

5

BLK/WHT

771

Transmission Position Switch Signal-Bit 1

6

YEL

772

Transmission Position Switch Signal-Bit 2

7

GRY

773

Transmission Position Switch Signal-Bit 3

8

LT GRN

1371

Transmission Position Switch Signal-Bit 4

9

WHT

776

Transmission Position Switch Signal-Parity Bit

10

DK GRN

1373

Transmission Shift Selector Mode Signal

11

PPL

1146

Engine Brake Enable Signal

12-13

--

--

Not Used--Plugged

14

DK BLU

1378

Transmission Shift Selector Display Signal

15

--

--

Not Used--Plugged

16

ORN

1940

Fuse Output-Battery-Type III Fuse

17

WHT/BLK

1922

Serial Data Link-B-SAE 1708

18-30

--

--

Not Used--Plugged

31

TAN/BLK

456

Shift Indicator Lamp Output

32

BLK/WHT

1351

Ground-Clean

Transmission Control Module C3 (MWF)


Object Number: 39787  Size: CH

Connector Part Information

    • 12129025
    • 32 Way F Micro-Pack 100 W Series, Sealed (NAT)

Pin

Wire Color

Circuit No.

Function

1

ORN

1991

Shift Solenoid A Return

2

PPL

1992

Shift Solenoid B Return

3

DK GRN

1531

Shift Solenoid F Feed

4

RED

1525

Shift Solenoid A Feed

5

LT GRN

1527

Shift Solenoid C Feed

6

PPL

1529

Shift Solenoid E Feed

7

WHT

1532

Shift Solenoid G Feed

8

--

--

Not Used--Plugged

9

GRY

597

Reference Voltage Feed-5 Volt Reference

10-11

--

--

Not Used--Plugged

12

RED

1226

Transmission Pressure Switch Signal-Bit 3

13

RED/BLK

645

Sensor Return

14

RED/BLK

1230

Transmission Input Speed Sensor Signal

15

ORN

1983

Transmission Turbine Speed Switch Signal

16

YEL

400

Vehicle Speed Sensor Signal

17

YEL

1993

Shift Solenoid C Return

18-19

--

--

Not Used--Plugged

20

WHT

1526

Shift Solenoid B Feed

21

DK BLU

1528

Shift Solenoid D Feed

22

WHT

1994

Shift Solenoid F Output

23-24

--

--

Not Used--Plugged

25

BLK

407

Sensor Return

26

WHT

1971

Transmission Oil Level Sensor Signal

27

YEL/BLK

1227

Transmission Temperature Sensor Signal

28-29

--

--

Not Used--Plugged

30

DK BLU/WHT

1231

Transmission Input Speed Sensor Return

31

LT BLU

1984

Transmission Turbine Speed Switch Return

32

PPL

401

Vehicle Speed Sensor Return