GM Service Manual Online
For 1990-2009 cars only
Table 1: Front Axle Switch
Table 2: Transfer Case Control Module, (C1)
Table 3: Transfer Case Control Module, C2
Table 4: Transfer Case Select Switch, C1
Table 5: Transfer Case Select Switch, C2
Table 6: Transfer Case Encoder Motor, C1
Table 7: Transfer Case Encoder Motor, C2
Table 8: Transfer Case Shift Solenoid
Table 9: Transfer Case Speed Sensor, Front
Table 10: Transfer Case Speed Sensor, Rear
Table 11: C103
Table 12: C114

Front Axle Switch


Object Number: 38552  Size: CH

Connector Part Information

    • 12103584
    • 2-Way M Weather-Pack (BRN)

Pin

Wire Color

Circuit No.

Function

A

BRN

241

Fuse Output - Ignition 3

B

BLK/WHT

1695

4WD Front Wheel Lock Telltale Feed

Transfer Case Control Module, (C1)


Object Number: 73221  Size: CH

Connector Part Information

    • 12052107
    • 32-Way F Micro-Pack 100 Series (ORN)

Pin

Wire Color

Circuit No.

Function

E1

TAN

1569

Transfer Case Lock Solenoid Output

E2

--

--

Not Used

E3

PNK

1561

AWD Indicator Output

E4

LT GRN /BLK

1563

Transfer Case Indicator Lamp Output - 2 High

E5

BRN/WHT

1555

Encoder Channel P

E6

RED/WHT

1556

Encoder Channel C

E7

YEL/BLK

1558

Encoder Channel B

E8

DK BLU/WHT

1557

Encoder Channel A

E9

PPL

1807

Serial Data Signal - Class B-10400 BAUD - Primary

E10

BRN

241

Fuse Output - Ignition 3

E11

--

--

Not Used

E12

YEL

400

Vehicle Speed Sensor Signal

E13

PPL

401

Vehicle Speed Sensor Return

E14

BLK/WHT

1695

4WD Front Wheel Lock Telltale Feed

E15

--

--

Not Used

E16

BLK/WHT

451

Ground

F1

PPL/WHT

1565

Indicator Lamp Output - 4 LO

F2

TAN/BLK

1566

Indicator Lamp Output - 4 HI

F3

BRN

1560

Neutral Indicator Lamp Output

F4

GRYBLK

1570

Encoder Channel P

F5

LT BLU

2221

Vehicle Speed Sensor Signal

F6

DK GRN

2222

Vehicle Speed Sensor Return

F7

GRY/BLK

1694

4WD Switch Signal - Low - Auto Trans Only

F8-F11

--

--

Not Used

F12

BLK/WHT

1554

Transfer Case Encoder Signal Return

F13

LT GRN/BLK

431

8 - Volt Reference Feed

F14

LT GRN/BLK

431

8 - Volt Reference Feed

F15

LT GRN/BLK

584

Fuse Output-Brake Transmission Shift Interlock - Auto Trans Only

F16

LT BLU

1693

4WD Switch Signal

Transfer Case Control Module, C2


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

1552

Transfer Case Motor Feed - Clockwise

B

RED

1553

Transfer Case Motor Feed - Counterclockwise

C

BLK

1850

Ground

D

ORN

1640

Fuse Output - Battery

Transfer Case Select Switch, C1


Object Number: 130635  Size: CH

Connector Part Information

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

Pin

Wire Color

Circuit No.

Function

A

LT GRN/BLK

431

8 - Volt Reference

B

BRN

1563

Neutral Indicator Lamp Output

C

PPL/WHT

1565

Indicator Lamp Output - 4 LO

D

TAN/BLK

1566

Indicator Lamp Output - 4 HI

Transfer Case Select Switch, C2


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

1850

Ground

B

PNK

1561

Indicator Lamp Output - AWD

C

LT GRN/BLK

1560

Indicator Lamp Output - 2 HI

D

--

--

Not Used

E

PPL/WHT

1382

LED Dimming Signal

F

GRA

1220

Fuse Output - Instrument Panel Lamps

G

BRN

241

Fuse Output - Ignition 3

H

LT BLU

1693

4WD Switch Signal

Transfer Case Encoder Motor, C1


Object Number: 365977  Size: CH

Connector Part Information

    • 12191399
    • 4-Way F Metri-Pack 280 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1552

Transfer Case Motor Feed - Clockwise

B

RED

1553

Transfer Case Motor Feed - Counterclockwise

C

ORN

1640

Fuse Output - Battery

D

TAN

1569

Transfer Case Lock Solenoid Output

Transfer Case Encoder Motor, C2


Object Number: 333040  Size: CH

Connector Part Information

    • 12052848
    • 6-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1554

Transfer Case Encoder Signal Return

B

DK BLU/WHT

1557

Encoder Channel A

C

RED/WHT

1556

Encoder Channel C

D

YEL/BLK

1558

Encoder channel B

E

LT GRN/BLK

431

8 - Volt Reference

F

BRN/WHT

1555

Encoder Channel P

Transfer Case Shift Solenoid


Object Number: 35437  Size: CH

Connector Part Information

    • 12052641
    • 2-Way F Metri-Pack 150 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

241

Fuse Output - Ignition 3

B

GRY/BLK

1570

Front Axle Actuator Output

Transfer Case Speed Sensor, Front


Object Number: 237066  Size: CH

Connector Part Information

    • 12162194
    • 2-Way F Metri-Pack 150.2 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

YEL

400

Vehicle Speed Sensor Signal

B

PPL

401

Vehicle Speed Sensor Return

Transfer Case Speed Sensor, Rear


Object Number: 237066  Size: CH

Connector Part Information

    • 12162194
    • 2-Way F Metri-Pack 150.2 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

LT BLU

2221

Vehicle Speed Sensor Signal

B

DK GRN

2222

Vehicle Speed Sensor Return

C103


Object Number: 366120  Size: CF

Connector Part Information

    • 153126084
    • 16-Way F Metri-Pack 150 Series (BLK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1552

Transfer Case Motor Feed - Clockwise

B

YEL

400

Vehicle Speed Sensor Signal

C

PPL

401

Vehicle Speed Sensor Return

D

LT GRN/BLK

431

8 - Volt Reference

E

BLK/WHT

1554

Transfer Case Encoder Signal - Return

F

BRN/WHT

1555

Encoder Channel B

G

RED/WHT

1556

Encoder Channel C

H

ORN

1640

Fuse Output - Battery

J

RED

1553

Transfer Case Motor Feed - Counterclockwise

K

LT BLU

2221

Vehicle Speed Sensor Signal

L

DK GRN

2222

Vehicle Speed Sensor Return

M

DK BLU/WHT

1557

Encoder Channel A

N

YEL/BLK

1558

Encoder Channel B

P-R

--

--

Not Used

S

TAN

1569

Transfer Case Lock Solenoid Output

C114


Object Number: 283889  Size: CF

Connector Part Information

    • 121110293
    • 3-Way F Metri-Pack 150 Series Sealed (BLK)

Pin

Wire Color

Circuit No.

Function

A

BRN

241

Fuse Output - Ignition 3

B

BLK/WHT

1695

4WD Front Wheel Lock Telltale Feed

C

GRA/BLK

1570

Front Axle Actuator Signal