GM Service Manual Online
For 1990-2009 cars only
Table 1: Rear Differential Lock Actuator
Table 2: Transfer Case Encoder Motor
Table 3: Transfer Case Shift Control Module - C1
Table 4: Transfer Case Shift Control Module - C2
Table 5: Transfer Case Shift Control Module - C3
Table 6: Transfer Case Shift Control Switch - C1
Table 7: Transfer Case Shift Control Switch - C2

Rear Differential Lock Actuator


Object Number: 523630  Size: CH

Connector Part Information

    • 15326801
    • 2-Way F GT 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1725

Rear Differential Lock - Low - Reference

B

LT GRN

2659

Rear Differential Lock - High - Control

Transfer Case Encoder Motor


Object Number: 831388  Size: CH

Connector Part Information

    • 15326906
    • 8-Way F GT 280 SLD (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1554

Encoder Low Reference

B

BRN/WHT

1555

Channel P Encoder - Signal

C

RED/WHT

1556

Channel C Encoder - Signal

D

BLK

1552

Motor Control B

E

RED

1553

Motor Control A

F

--

--

Not Used

G

YEL/BLK

1558

Channel B Encoder - Signal

H

DK BLU/WHT

1557

Channel A Encoder - Signal

Transfer Case Shift Control Module - C1


Object Number: 744295  Size: CH

Connector Part Information

    • 12084944
    • 16-Way F Micro-Pack 100 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A1

DK GRN/WHT

1133

ATC Class 2 Serial Data

A2

LT GRN

2659

Rear Differential Lock - High - Control

A3

PNK

1561

Rear Differential Lock Indicator Control

A4

PPL/WHT

1565

4 'LO' Indicator - Control

A5

TAN/BLK

1566

4 'HI' Indicator - Control

A6

LT BLU

1693

Switch Signal

A7

RED/WHT

1556

Channel C Encoder - Signal

A8

--

--

Not Used

B1

--

--

Not Used

B2

YEL/BLK

1558

Channel B Encoder - Signal

B3

LT GRN/BLK

1563

4 'HI' Indicator - Control

B4

BRN

1560

Neutral Indicator Control

B5

GRY/BLK

1694

4WD Low Signal

B6

BRN/WHT

1555

Channel P Encoder - Signal

B7

--

--

Not Used

B8

BLK

1725

Rear Diffeential Lock - Low - Reference

Transfer Case Shift Control Module - C2


Object Number: 744296  Size: CH

Connector Part Information

    • 12110259
    • 16-Way F Micro-Pack 100 Series (GRN)

Pin

Wire Color

Circuit No.

Function

A1-A7

--

--

Not Used

A8

BLK/WHT

1554

Encoder Low Reference

B1-B5

--

--

Not Used

B6

DK BLU/WHT

1557

Channel A Encoder - Signal

B7

--

--

Not Used

B8

GRY

596

5-Volt Reference

Transfer Case Shift Control Module - C3


Object Number: 62450  Size: CH

Connector Part Information

    • 12052856
    • 4-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1550

Ground

B

ORN

1640

Battery Positive Voltage

C

RED

1553

Motor Control A

D

BLK

1552

Motor Control B

Transfer Case Shift Control Switch - C1


Object Number: 39746  Size: CH

Connector Part Information

    • 12064862
    • 8-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1050

Ground

B

PNK

1561

Differential Lock Indicator Control

C

BRN

1560

Neutral Indicator Control

D

--

--

Not Used

E

PPL/WHT

1382

4LO LED Dimming Signal

F

BRN/WHT

230

Instrument Panel Lamps Dimming Control

G

BRN

241

Ignition 3 Voltage

H

LT BLU

1693

Switch Signal

Transfer Case Shift Control Switch - C2


Object Number: 130635  Size: CH

Connector Part Information

    • 12045813
    • 4-Way F Metri-Pack 150 Series (NAT)

Pin

Wire Color

Circuit No.

Function

A

GRY

596

5-Volt Reference

B

LT GRN/BLK

1563

4 'HI' Indicator - Control

C

PPL/WHT

1565

4 'LO' Indicator - Control

D

TAN/BLK

1566

4 'HI' Indicator - Control