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

Transfer Case Shift Control Module - C1


Object Number: 744295  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1

D-GN/WH

1133

ATC Class 2 Serial Data

A2-A3

--

--

Not Used

A4

PU/WH

1565

4 LO Indicator Control

A5

PK

1561

AWD Indicator Control

A6

L-BU

1693

Switch Signal

A7

RD/WH

1556

Channel C Encoder - Signal

A8

--

--

Not Used

B1

--

--

Not Used

B2

YE/BK

1558

Channel B Encoder - Signal

B3

--

--

Not Used

B4

BN

1560

Neutral Indicator Control

B5

GY/BK

1694

4WD Low Signal

B6

BN/WH

1555

Channel P Encoder - Signal

B7-B8

--

--

Not Used

Transfer Case Shift Control Module - C2


Object Number: 744296  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A1-A7

--

--

Not Used

A8

BK/WH

1554

Encoder Signal Ground

B1-B5

--

--

Not Used

B6

D-BU/WH

1557

Channel A Encoder - Signal

B7

--

--

Not Used

B8

GY

596

5-Volt Reference

Transfer Case Shift Control Module - C3


Object Number: 62450  Size: CH

Connector Part Information

    • 12052856
    • 4-Way F Micro-Pack 280 Series (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

2150

Ground

B

OG

1640

Battery Positive Voltage

C

RD

1553

Motor Control A

D

BK

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 (BK)

Pin

Wire Color

Circuit No.

Function

A

BK

1050

Ground

B

--

--

Not Used

C

BN

1560

Neutral Indicator Control

D

--

--

Not Used

E

PU/WH

1382

LED Dimming Supply

F

BN/WH

230

Instrument Panel Lamps Dimming Control

G

BN

241

Ignition 3 Voltage

H

GY

596

5-Volt Reference

Transfer Case Shift Control Switch - C2


Object Number: 73231  Size: CH

Connector Part Information

    • 12064860
    • 6-Way F Metri-Pack 150 Series (BK)

Pin

Wire Color

Circuit No.

Function

A-B

--

--

Not Used

C

PK

1561

AWD Indicator Control

D

PU/WH

1565

4 LO Indicator Control

E

--

--

Not Used

F

L-BU

1693

Switch Signal

Transfer Case - Encoder Motor


Object Number: 646372  Size: CH

Connector Part Information

    • 15326654
    • 8-Way F GT 280 Series Sealed (BK)

Pin

Wire Color

Circuit No.

Function

A

BK/WH

1554

Encoder Signal Ground

B

BN/WH

1555

Channel P Encoder - Signal

C

RD/WH

1556

Channel C Encoder - Signal

D

BK

1552

Motor Control B

E

RD

1553

Motor Control A

F

--

--

Not Used

G

YE/BK

1558

Channel B Encoder - Signal

H

D-BU/WH

1557

Channel A Encoder - Signal