GM Service Manual Online
For 1990-2009 cars only
Connector 1: Front Axle Actuator
Connector 2: Propshaft Speed Sensor - Front
Connector 3: Propshaft Speed Sensor - Rear
Connector 4: Transfer Case Encoder Motor
Connector 5: Transfer Case Shift Control Module C1
Connector 6: Transfer Case Shift Control Module C2
Connector 7: Transfer Case Shift Control Module C3
Connector 8: Transfer Case Shift Control Switch

Front Axle Actuator


Object Number: 646430  Size: CH

Connector Part Information

  • OEM: 15326815
  • Service: 15306396
  • Description: 4-Way F GT 150 Series Sealed (BK)

Terminal Part Information

  • Terminal/Tray: 12191819/8
  • Core/Insulation Crimp: E/A
  • Release Tool/Test Probe: 15315247/J-35616-2A (GY)

Front Axle Actuator

Pin

Wire Color

Circuit No.

Function

A

L-BU

1296

Axle Actuator - Control

B

BK

350

Ground

C

BK/WH

1695

Axle Switch Signal

D

BN

241

Ignition 3 Voltage

Propshaft Speed Sensor - Front


Object Number: 1538760  Size: CH

Connector Part Information

  • OEM: 15449028
  • Service: 88987993
  • Description: 2-Way F GT 150 Series Sealed (BK)

Terminal Part Information

  • Terminal/Tray: 15326267/19
  • Core/Insulation Crimp: E/4
  • Release Tool/Test Probe: 15315247/J-35616-2A (GY)

Propshaft Speed Sensor - Front

Pin

Wire Color

Circuit No.

Function

A

YE

400

Signal High - Front

B

PU

401

Signal Low - Front

Propshaft Speed Sensor - Rear


Object Number: 1538760  Size: CH

Connector Part Information

  • OEM: 15449028
  • Service: 88987993
  • Description: 2-Way F GT 150 Series Sealed (BK)

Terminal Part Information

  • Terminal/Tray: 15326267/19
  • Core/Insulation Crimp: E/4
  • Release Tool/Test Probe: 15315247/J-35616-2A (GY)

Propshaft Speed Sensor - Rear

Pin

Wire Color

Circuit No.

Function

A

L-BU

2221

Signal High - Rear

B

D-GN

2222

Signal Low - Rear

Transfer Case Encoder Motor


Object Number: 646372  Size: CH

Connector Part Information

  • OEM: 15326654
  • Service: 88986254
  • Description: 8-Way F GT 280 Series Sealed (BK)

Terminal Part Information

  • Pins: D, E, F
  • Terminal/Tray: 15304720/19
  • Core/Insulation Crimp: 4/5
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: A, B, C
  • Terminal/Tray: 15304719/19
  • Core/Insulation Crimp: E/5
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)
  • Pins: G
  • Terminal/Tray: 15304719/19
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 15315247/J-35616-4A (PU)

Transfer Case Encoder Motor

Pin

Wire Color

Circuit No.

Function

A

GY

605

5-Volt Reference

B

BN/WH

1555

Encoder Signal

C

BK/WH

1554

Encoder Low Reference

D

BK

1552

Motor Control A

E

RD

1553

Motor Control B

F

OG

1640

Battery Positive Voltage

G

TN

1569

Lock Solenoid Control

H

--

--

Not Used

Transfer Case Shift Control Module C1


Object Number: 744295  Size: CH

Connector Part Information

  • OEM: 12084944
  • Service: 12084944
  • Description: 16-Way F Micro-Pack 100 Series Unsealed (BK)

Terminal Part Information

  • Pins: A1, A2, A3, A4, A5, A6, A7, B3, B4, B5, B6, B8
  • Terminal/Tray: 12146447/3
  • Core/Insulation Crimp: E/C
  • Release Tool/Test Probe: 12031876-1/J-35616-6 (BN)
  • Pins: B2
  • Terminal/Tray: 12146448/19
  • Core/Insulation Crimp: E/A
  • Release Tool/Test Probe: 12031876-1/J-35616-6 (BN)

Transfer Case Shift Control Module C1

Pin

Wire Color

Circuit No.

Function

A1

D-GN/WH

1133

ATC Class 2 Serial Data

A2

L-BU

1296

Axle Actuator - Control

A3

PK

1561

AWD Indicator Control

A4

PU/WH

1565

4 LO Indicator - Control

A5

TN/BK

1566

4 HI Indicator - Control

A6

L-BU

1693

Switch Signal

A7

BK/WH

1554

Encoder Low Reference

A8

--

--

Not Used

B1

--

--

Not Used

B2

TN

1569

Lock Solenoid Control

B3

L-GN/BK

1563

2 HI Indicator - Control

B4

BN

1560

Neutral Indicator Control

B5

GY/BK

1694

4WD Low Signal

B6

BN/WH

1555

Encoder Signal

B7

--

--

Not Used

B8

BK/WH

751

Ground

Transfer Case Shift Control Module C2


Object Number: 73152  Size: CH

Connector Part Information

  • OEM: 12084945
  • Service: 12084945
  • Description: 16-Way F Micro-Pack 100 Series Unsealed (GY)

Terminal Part Information

  • Pins: A1, A2, A8, B1, B2, B6, B8
  • Terminal/Tray: 12146447/3
  • Core/Insulation Crimp: E/C
  • Release Tool/Test Probe: 12031876-1/J-35616-6 (BN)

Transfer Case Shift Control Module C2

Pin

Wire Color

Circuit No.

Function

A1

PU

401

Signal Low - Front

A2

YE

400

Signal High - Front

A3-A7

--

--

Not Used

A8

GY

605

5-Volt Reference

B1

L-BU

2221

Signal High - Rear

B2

D-GN

2222

Signal Low - Rear

B3-B5

--

--

Not Used

B6

BK/WH

1695

Axle Switch Signal

B7

--

--

Not Used

B8

GY

596

5-Volt Reference

Transfer Case Shift Control Module C3


Object Number: 62450  Size: CH

Connector Part Information

  • OEM: 12052856
  • Service: 12125636
  • Description: 4-Way F Metri-Pack 280 Series Unsealed (BK)

Terminal Part Information

  • Terminal/Tray: 12015858/4
  • Core/Insulation Crimp: See Terminal Repair Kit
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)

Transfer Case Shift Control Module C3

Pin

Wire Color

Circuit No.

Function

A

BK

850

Ground

B

OG

1640

Battery Positive Voltage

C

BK

1552

Motor Control A

D

RD

1553

Motor Control B

Transfer Case Shift Control Switch


Object Number: 647976  Size: CH

Connector Part Information

  • OEM: 15332161
  • Service: 15306416
  • Description: 12-Way F GT 150 Series Unsealed (BK)

Terminal Part Information

  • Pins: A, B, C, D, E, F, G, H, J, L, M
  • Terminal/Tray: 12191812/19
  • Core/Insulation Crimp: E/C
  • Release Tool/Test Probe: 15315247/J-35616-2A (GY)

Transfer Case Shift Control Switch

Pin

Wire Color

Circuit No.

Function

A

PU/WH

1565

4 LO Indicator - Control

B

PU/WH

1382

LED Dimming Signal

C

BN/WH

230

Instrument Panel Lamps Dimming Control

D

BK

2250

Ground

E

TN/BK

1566

4 HI Indicator - Control

F

PK

1561

AWD Indicator Control

G

BN

1560

Neutral Indicator Control

H

BN

241

Ignition 3 Voltage

J

GY

596

5-Volt Reference

K

--

--

Not Used

L

L-GN/BK

1563

2 HI Indicator - Control

M

L-BU

1693

Switch Signal