GM Service Manual Online
For 1990-2009 cars only
Connector 1: Automatic Transmission Input Shaft Speed (AT ISS) Sensor
Connector 2: Automatic Transmission Shift Selector (Allison® MD)
Connector 3: Overdrive Defeat Switch (Allison® LCT)
Connector 4: Transmission Control Module (TCM) (Allison® LCT w/L18/LLY)
Connector 5: Transmission Control Module (TCM) C1 (Allison® LCT w/LG4/LG5)
Connector 6: Transmission Control Module (TCM) C2 (Allison® LCT w/LG4/LG5)
Connector 7: Transmission Control Module (TCM) C1 (Allison® MD)
Connector 8: Transmission Control Module (TCM) C2 (Allison® MD)
Connector 9: Transmission Control Module (TCM) C3 (Allison® MD)
Connector 10: Turbine Shaft Speed (TSS) Sensor (Allison® LCT)
Connector 11: Vehicle Speed Sensor (VSS)

Automatic Transmission Input Shaft Speed (AT ISS) Sensor


Object Number: 1710949  Size: CH

Connector Part Information

  • OEM: 15490465
  • Service: See Catalog
  • Description: 2-Way F GT 150 Series, Sealed (BK)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Automatic Transmission Input Shaft Speed (AT ISS) Sensor

Pin

Wire Color

Circuit No.

Function

A

RD/BK

1230

AT ISS High Signal

B

D-BU/WH

1231

AT ISS Low Signal

Automatic Transmission Shift Selector (Allison® MD)


Object Number: 1391747  Size: CH

Connector Part Information

  • OEM: 15383243
  • Service: 15383243
  • Description: 14-Way AMP, Sealed (BK)

Terminal Part Information

  • Terminal/Tray: 770520-1/25
  • Core/Insulation Crimp: E/A
  • Release Tool/Test Probe: N/A/J-35616-6 (BN)

Automatic Transmission Shift Selector (Allison® MD)

Pin

Wire Color

Circuit No.

Function

1

OG

1940

Battery Positive Voltage

2

L-BU

553

Tow/Haul Switch Signal

3

GY

598

5-Volt Reference

4

BK/WH

351

Ground

5

GY

8

Instrument Panel Lamps Dimmer Switch Signal

6

--

--

Not Used

7

D-BU

1378

Transmission Shift Selector Display Signal

8

BK

450

Ground

9

D-GN

1373

Transmission Shift Selector Mode Signal

10

BK/WH

771

Transmission Range Switch Signal A

11

YE

772

Transmission Range Switch Signal B

12

L-GN

1371

Transmission Position Switch - Signal - Bit 4

13

TN

2654

Transmission Position Switch - Signal - Bit 8

14

WH

776

Transmission Range Switch Signal P

Overdrive Defeat Switch (Allison® LCT)


Object Number: 40422  Size: CH

Connector Part Information

  • OEM: 12064762
  • Service: 12125665
  • Description: 6-Way F Metri-Pack 150 Series (WH)

Terminal Part Information

  • Terminal/Tray: 12064971/5
  • Core/Insulation Crimp: E/C
  • Release Tool/Test Probe: 12094429/J-35616-2A (GY)

Overdrive Defeat Switch (Allison® LCT)

Pin

Wire Color

Circuit No.

Function

A

BK

750

Ground

B

BK

750

Ground

C

TN/WH

2678

Overdrive Defeat Switch Signal

D

PK

239

Ignition 1 Voltage

E

BN

2509

Left Rear Park Lamps Supply Voltage

F

TN/WH

2678

Overdrive Defeat Switch Signal

Transmission Control Module (TCM) (Allison® LCT w/L18/LLY)


Object Number: 1608552  Size: CH

Connector Part Information

  • OEM: 15491297
  • Service: 19115369
  • Description: 80-Way F Sealed (BK)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Transmission Control Module (TCM) (Allison® LCT)

Pin

Wire Color

Circuit No.

Function

1

TN

1147

Transmission Shift Inhibit Signal

2

--

--

Not Used

3

TN

476

Low Reference

4

L-BU

1480

Transmission Power Take-Off Enable Signal

5

OG/BK

463

Requested Torque Signal (L18)

6

D-BU

6105

High Speed GMLAN Serial Data Bus+

7-8

--

--

Not Used

9

BK/WH

351

Ground

10

OG

440

Battery Positive Voltage

11

D-GN/WH

2528

12-Volt Reference

12-13

--

--

Not Used

14

GY

773

Internal Mode Switch Signal C

15-16

--

--

Not Used

17

PK

1224

Transmission Fluid Pressure Switch Signal 1

18

L-BU

2221

Signal High - Rear

19

--

--

Not Used

20

L-BU

1984

Transmission Turbine Speed Switch Low Reference

21

YE

2522

PTO Engaged Signal

22

WH

2467

Unmanaged Torque Signal (L18)

23

YE

1479

A/T Neutral Signal

24-25

--

--

Not Used

26

TN/WH

6105

High Speed GMLAN Serial Data Bus+ (L18)

27

TN

6106

High Speed GMLAN Serial Data Bus-

28

--

--

Not Used

29

GY

1234

Do Not Shift Indicator Control

30-32

--

--

Not Used

33

YE/BK

2879

Shift Solenoid 2 Valve Control

34

WH

776

Internal Mode Switch Signal P

35

--

--

Not Used

36

BN/WH

2469

PCS Valve 2 Control

37-38

--

--

Not Used

39

D-BU/WH

1231

AT ISS Low Signal

40

L-GN/BK

822

VSS Low Signal

41-43

--

--

Not Used

44

TN/BK

464

Delivered Torque Signal (L18)

45

PU

1146

Range Indicator

46

YE

2470

Class 2 Serial Data

47

TN

6106

High Speed GMLAN Serial Data Bus- (LLY)

48-50

--

--

Not Used

51

OG/WH

2527

Shift Solenoid 3 Valve Control

52

PU

898

Shift Solenoid 1 Valve Control

53

YE

772

Internal Mode Switch Signal B

54

YE/BK

1227

TFT Sensor Signal

55

L-BU/WH

1229

PCS Valve 1 Control

56

--

--

Not Used

57

RD

1226

Transmission Fluid Pressure Switch Signal 3

58

BK

407

Low Reference

59

RD/BK

1230

AT ISS High Signal

60

PU/WH

821

VSS High Signal

61

TN/WH

2678

Overdrive Defeat Switch Signal

62

--

--

Not Used

63

PK

1020

Ignition 0 Voltage

64

--

--

Not Used

65

GY

1524

Backup Lamp Relay Control

66

D-BU

6105

High Speed GMLAN Serial Data Bus+ (LLY)

67-68

--

--

Not Used

69

BK/WH

351

Ground

70

OG

440

Battery Positive Voltage

71

BN

323

12-Volt Reference

72

--

--

Not Used

73

BK/WH

771

Internal Mode Switch Signal A

74

D-BU

1530

Transmission Mainline Pressure Solenoid Control

75

--

--

Not Used

76

PU

2471

Trans ID

77

L-GN/BK

2529

Transmission Fluid Pressure Switch Signal 4 (Reverse)

78

WH

1994

TCC PWM Solenoid Valve Control

79

D-BU

1225

Transmission Fluid Pressure Switch Signal 2

80

OG

1983

Transmission Turbine Speed Switch Signal

Transmission Control Module (TCM) C1 (Allison® LCT w/LG4/LG5)


Object Number: 698666  Size: CH

Connector Part Information

  • OEM: 15305371
  • Service: 15305371
  • Description: 32-Way F Micro-Pack 100 W (GY)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Transmission Control Module (TCM) C1 (Allison® LCT w/LG4/LG5)

Pin

Wire Color

Circuit No.

Function

1

BK/WH

351

Ground

2

PK

1020

Ignition 0 Voltage

3

OG

440

Battery Positive Voltage

4

PK

1020

Ignition 0 Voltage

5

BK/WH

351

Ground

6

YE

2522

PTO Engaged Signal

7

PU

420

TCC Brake Switch/Cruise Control Release Signal

8

YE

1479

A/T Neutral Signal

9

--

--

Not Used

10

TN/WH

2678

Overdrive Defeat Switch Signal

11

TN

1147

Transmission Shift Inhibit Signal

12

GY/BK

1694

4WD Low Signal (NP1)

--

--

Not Used (w/o NP1)

13-18

--

--

Not Used

19

L-BU

1480

Transmission Power Take-Off Enable Signal

20

--

--

Not Used

21

PU

1146

Range Indicator

22-24

--

--

Not Used

25

GY

1234

Do Not Shift Indicator Control

26

--

--

Not Used

27

L-BU

2221

Signal High - Rear (NP1)

YE

400

VSS High Signal (w/o NP1)

28

BK

407

Low Reference

29

YE

2361

SAE J1939 Serial Data Bus+

30

YE

2470

Class 2 Serial Data

31

--

--

Not Used

32

D-GN

2362

SAE J1939 Serial Data Bus-

Transmission Control Module (TCM) C2 (Allison® LCT w/LG4/LG5)


Object Number: 698666  Size: CH

Connector Part Information

  • OEM: 15305371
  • Service: 15305371
  • Description: 32-Way F Micro-Pack 100 W (GY)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Transmission Control Module (TCM) C2 (Allison® LCT w/LG4/LG5)

Pin

Wire Color

Circuit No.

Function

1

PK

1224

Transmission Fluid Pressure Switch Signal A

2

D-BU

1225

Transmission Fluid Pressure Switch Signal B

3

RD

1226

Transmission Fluid Pressure Switch Signal C

4

L-GN/BK

2529

Transmission Fluid Pressure Switch Signal R

5

BK/WH

771

Transmission Range Switch Signal A

6

YE

772

Transmission Range Switch Signal B

7

GY

773

Transmission Range Switch Signal C

8

WH

776

Transmission Range Switch Signal-Pariety Bit

9

--

--

Not Used

10

YE/BK

1227

TFT Sensor Signal

11-12

--

--

Not Used

13

OG

1983

Transmission Turbine Speed Switch Signal

14

L-BU

1984

Transmission Turbine Speed Switch Low Reference

15

PU/WH

821

VSS High Signal

16

L-GN/BK

822

VSS Low Signal

17

RD/BK

1230

AT ISS High Signal

18

D-BU/WH

1231

AT ISS Low Signal

19

GY

1148

Transmission Shift Inhibit Signal

--

--

Not Used (LG4)

20

BK

2762

Low Reference

21

PU

2471

Trans ID

22

L-BU/WH

1229

PC Solenoid Valve Low Control (Sol. A)

23

RD/BK

1228

PC Solenoid Valve High Control (Sol. A)

24

PK/BK

2468

PC Solenoid Valve High Control (Sol. B)

25

BN/WH

2469

PC Solenoid Valve Low Control (Sol. B)

26

L-GN

1222

Shift Solenoid A Valve Control

27

YE/BK

1223

Shift Solenoid B Valve Control

28

OG/WH

2527

Shift Solenoid C Valve Control

29

BN

418

TCC PWM Solenoid Valve Control

30

--

--

Not Used

31

BN

323

12-Volt Reference

32

D-GN/WH

2528

Main Pressure Modulation

Transmission Control Module (TCM) C1 (Allison® MD)


Object Number: 698666  Size: CH

Connector Part Information

  • OEM: 15305371
  • Service: 15305371
  • Description: 32-Way F Micro-Pack 100 W (GY)

Terminal Part Information

  • Terminal/Tray: 12084912/5
  • Core/Insulation Crimp: W/W
  • Release Tool/Test Probe: 12122523/J-35616-6 (BN)

Transmission Control Module (TCM) C1 (Allison® MD)

Pin

Wire Color

Circuit No.

Function

1

TN/BK

1921

SAE J1587 Serial Data Bus+ Primary

2

--

--

Not Used

3

GY

598

5-Volt Reference

4

YE

2655

Ignition Sensor Signal

5

BK/WH

771

Transmission Range Switch Signal A

6

YE

772

Transmission Range Switch Signal B

7

L-GN

1371

Transmission Range Switch Signal C

8

TN

2654

Transmission Range Switch Signal P

9

WH

776

Transmission Range Switch Signal P

10

D-GN

1373

Transmission Shift Selector Mode Signal

11-12

--

--

Not Used

13

YE

2361

SAE J1939 Serial Data Bus+

14

D-BU

1378

Transmission Shift Selector Display Signal

15

--

--

Not Used

16

RD/WH

1940

Battery Positive Voltage

17

WH/BK

1922

SAE J1708 Serial Data B

18-28

--

--

Not Used

29

D-GN

2362

SAE J1939 Serial Data Bus-

30

--

--

Not Used

31

GY

1234

Do Not Shift Indicator Control

32

L-BU

553

Tow/Haul Switch Signal

Transmission Control Module (TCM) C2 (Allison® MD)


Object Number: 698666  Size: CH

Connector Part Information

  • OEM: 15305371
  • Service: 15305371
  • Description: 32-Way F Micro-Pack 100 W (RD)

Terminal Part Information

  • Terminal/Tray: 12084912/5
  • Core/Insulation Crimp: W/W
  • Release Tool/Test Probe: 12122523/J-35616-6 (BN)

Transmission Control Module (TCM) C2 (Allison® MD)

Pin

Wire Color

Circuit No.

Function

1

RD/WH

440

Battery Positive Voltage

2

PU

1146

Engine Brake Enable Signal

3

--

--

Not Used

4

GY

1524

Backup Lamp Relay Control

5

--

--

Not Used

6

YE

1479

A/T Neutral Signal

7-10

--

--

Not Used

11

TN

1147

Transmission Shift Inhibit Signal

12

YE

1481

Transmission Auxiliary Hold Signal

13

YE

915

PTO Engage Signal

14-15

--

--

Not Used

16

RD/WH

440

Battery Positive Voltage

17

BK/WH

351

Ground

18

--

--

Not Used

19

GY

1148

Transmission Shift Inhibit Signal

20

L-BU

2221

Signal High - Rear

21

--

--

Not Used

22

L-BU

1480

Transmission Power Take-Off Enable Signal

23-25

--

--

Not Used

26

PK

1020

Ignition 0 Voltage

27-29

--

--

Not Used

30

YE

1479

A/T Neutral Signal

31

TN

476

Low Reference

32

BK/WH

351

Ground

Transmission Control Module (TCM) C3 (Allison® MD)


Object Number: 698666  Size: CH

Connector Part Information

  • OEM: 15305371
  • Service: 15305371
  • Description: 32-Way F Micro-Pack 100 W (NA)

Terminal Part Information

  • Terminal/Tray: 12084912/5
  • Core/Insulation Crimp: W/W
  • Release Tool/Test Probe: 12122523/J-35616-6 (BN)

Transmission Control Module (TCM) C3 (Allison® MD)

Pin

Wire Color

Circuit No.

Function

1

RD/BK

1525

12-Volt Reference

2

WH

1526

12-Volt Reference

3

D-GN

1531

12-Volt Reference

4

OG

1991

Shift Solenoid A Valve Control

5

PU

898

Shift Solenoid C Valve Control

6

OG/WH

2527

Shift Solenoid E Valve Control

7

WH

2880

Shift Solenoid G Valve Control

8

--

--

Not Used

9

D-GN

1313

5-Volt Reference

10-11

--

--

Not Used

12

RD

1226

Transmission Fluid Pressure Switch Signal C

13

PU

2471

Trans ID

14

RD/BK

1230

AT ISS High Signal

15

OG

1983

Transmission Turbine Speed Switch Signal

16

YE

400

Signal High - Front

17

L-GN

1527

12-Volt Reference

18-19

--

--

Not Used

20

PU

1992

Shift Solenoid B Valve Control

21

YE/BK

2879

Shift Solenoid D Valve Control

22

WH

1994

Shift Solenoid F Valve Control

23-24

--

--

Not Used

25

BK

407

Low Reference

26

WH

1971

Transmission Oil Level Sensor Signal

27

YE/BK

1227

TFT Sensor Signal

28-29

--

--

Not Used

30

D-BU/WH

1231

AT ISS Low Signal

31

L-BU

1984

Transmission Turbine Speed Switch Low Reference

32

PU

401

Signal Low - Front

Turbine Shaft Speed (TSS) Sensor (Allison® LCT)


Object Number: 1710949  Size: CH

Connector Part Information

  • OEM: 15490465
  • Service: See Catalog
  • Description: 2-Way F GT 150 Series, Sealed (BK)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Turbine Shaft Speed (TSS) Sensor (Allison® LCT)

Pin

Wire Color

Circuit No.

Function

A

OG

1983

Transmission Turbine Speed Switch Signal

B

L-BU

1984

Transmission Turbine Speed Switch Low Reference

Vehicle Speed Sensor (VSS)


Object Number: 1710949  Size: CH

Connector Part Information

  • OEM: 15490465
  • Service: See Catalog
  • Description: 2-Way F GT 150 Series, Sealed (BK)

Terminal Part Information

  • Terminal/Tray: See Terminal Repair Kit
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: See Terminal Repair Kit

Vehicle Speed Sensor (VSS)

Pin

Wire Color

Circuit No.

Function

A

PU/WH

821

VSS High Signal (Allison® LCT)

YE

400

VSS High Signal (Allison® MD)

B

L-GN/BK

822

VSS Low Signal (Allison® LCT)

PU

401

VSS Low Signal (Allison® MD)