GM Service Manual Online
For 1990-2009 cars only

Transfer Case Control Connector End Views Selectable 4WD

Table 1: Transfer Case Control Module (Wire Entry View)
Table 2: Transfer Case Select Switch
Table 3: Transfer Case Relay

Transfer Case Control Module (Wire Entry View)


Object Number: 183881  Size: CH

Connector Part Information

    • 12045470
    • 32-Way F Micro-Pack 100 Series Natural

Pin

Wire Color

Circuit No.

Function

C1

BLK/WHT

1695

Front Axle Switch

C2

LT GRN/BLK

431

5V Reference Voltage

C3

DK GRN/WHT

1559

Transfer Case Select Switch Output--4 Low

C4

WHT

1562

Transfer Case Select Switch Output--2 High

C5

GRY/BLK

1564

Transfer Case Select Switch Output--4 High

C6

ORN

1640

Battery Fused Feed

C7

--

--

Not Used

C8

PNK

39

Ignition Fused Feed

C9

BLK/WHT

1554

Encoder Ground

C10

BLK

150

Ground

C11

PNK

1563

Indicator Lamp Output--2 High

C12

TAN/BLK

1566

Indicator Lamp Output--4 High

C13

--

--

Not Used

C14

PPL/WHT

1565

Indicator Lamp Output--4 Low

C15

--

--

Not Used

C16

BLK

1552

Transfer Case Motor Feed CW

D1

RED

1553

Transfer Case Motor Feed CCW

D2

LT GRN

275

Park/Neutral Position Switch Output--Park

D3

ORN

1568

Transfer Case Control Module Diagnostics Enable

D4

BRN/WHT

1555

Encoder Channel P

D5

RED/WHT

1556

Encoder Channel C

D6

DK BLU/WHT

1557

Encoder Channel A

D7

YEL/BLK

1558

Encoder Channel B

D8

DK GRN/WHT

817

Vehicle Speed Signal

D9

--

--

Not Used

D10

BLK

150

Ground

D11

--

--

Not Used

D12

BLK

150

Ground

D13

BLK

150

Ground

D14

ORN

1640

Battery Fused Feed

D15

ORN

1640

Battery Fused Feed

D16

YEL

1737

Park/Neutral Position Switch Output--Park/Neutral

Transfer Case Select Switch


Object Number: 183888  Size: CH

Connector Part Information

    • 12064769
    • 10-Way F Metri-Pack 150 Series Natural

Pin

Wire Color

Circuit No.

Function

A

PNK

39

Ignition Fused Feed

B

WHT

900

Transfer Case Select Switch Output--2 High

C

GRY/BLK

1564

Transfer Case Select Switch Output--4 High

D

DK GRN/WHT

1559

Transfer Case Select Switch Output--4 Low

E

PPL/WHT

1565

Indicator Lamp Output--4 Low

F

TAN/BLK

1566

Indicator Lamp Output--4 High

G

PNK

901

Indicator Lamp Output--2 High

H

BLK

150

Ground

J

GRY

8

Instrument Panel Lamp Feed

K

--

--

Not Used

Transfer Case Relay


Object Number: 183886  Size: CH

Connector Part Information

    • 12110539
    • M/P 280 FLXLK

Pin

Wire Color

Circuit No.

Function

30

LT/BLU

1296

Four Wheel Drive Relay Feed-Coil

85

RED

1297

Four Wheel Drive Synchronizing Relay Feed-Coil

86

GRY/BLK

1570

Front Axle Actuator Output

87

BLK/WHT

1695

Four Wheel Drive Front Wheel Lock Telltale Feed

87A

BLK

150

Ground

Transfer Case Control Connector End Views Automatic 4WD

Automatic Transfer Case Control Module


Object Number: 73221  Size: CH

Connector Part Information

    • 12052107
    • ASM 32M (BLK)

Pin

Wire Color

Circuit No.

Function

E1

TAN

1569

Transfer Case Lock Solenoid Output

E2

LT BLU/BLK

1567

Service 4WD/AWD Indicator Lamp Output

E3

PNK

1561

AWD Indicator Lamp Output

E4

LT GRN/BLK

1563

2 'HI' Indicator Lamp Output

E5

BRN/WHT

1555

Transfer Case Position Switch Encoder Signal - Channel P

E6

RED/WHT

1556

Transfer Case Position Switch Encoder Signal - Channel C

E7

YEL/BLK

1558

Transfer Case Position Switch Encoder Signal - Channel B

E8

DK BLU/WHT

1557

Transfer Case Position Switch Encoder Signal - Channel A

E9

PPL

1807

Serial Data Signal - Class B - 10400 BAUD - Primary

E10

BRN

241

Fuse Output - Ignition 3 - Type III Fuse

E11

--

--

Not Used

E12

YEL

400

VSS Signal

E13

PPL

401

VSS Return

E14

BLK/WHT

1695

4WD Front Wheel Lock Telltale Feed

E15

--

--

Not Used

E16

BLK/WHT

451

ECM Ground

F1

PPL/WHT

1565

4 'LO' Indicator Lamp Output

F2

TAN/BLK

1566

4 'HI' Indicator Lamp Output

F3

BRN

1560

Neutral Indicator Lamp Output

F4

GRY/BLK

1570

Front Axle Actuator Output

F5

LT BLU

2221

VSS Signal

F6

DK GRN

2222

VSS Return

F7

GRY/BLK

1694

4WD Switch Signal - Low

F8

--

--

Not Used

F9

--

--

Not Used

F10

--

--

Not Used

F11

--

--

Not Used

F12

BLK/WHT

1554

Transfer Case Encoder Signal Return

F13

LT GRN/BLK

431

Reference Voltage Feed - 8 Volt Reference

F14

LT GRN/BLK

431

Reference Voltage Feed - 8 Volt Reference

F15

LT GRN

275

Transmission Mounted Neutral Safety Switch Output - Park

F16

LT BLU/BLK

1693

4WD Switch Signal

Automatic Transfer Case Module


Object Number: 62450  Size: CH

Connector Part Information

    • 12052856
    • CONN 4F M/P 280 (BLACK)

Pin

Wire Color

Circuit No.

Function

A

BLK

1552

Transfer Case Motor Feed - CW

B

RED

1553

Transfer Case Motor Feed - CCW

C

BLK

150

Ground

D

ORN

1640

Fuse Output - Battery - Type III Fuse

Automatic Transfer Case Select Switch, Connector C1


Object Number: 62463  Size: CH

Connector Part Information

    • 12064766
    • CONN 8F M/P 150 (BLACK)

Pin

Wire Color

Circuit No.

Function

A

LT GRN/BLK

431

Reference Voltage Feed - 8 Volt Reference

B

LT BLU/BLK

1693

4WD Switch Signal

C

PPL/WHT

1565

4 'LO' Indicator Lamp Output

D

TAN/BLK

1566

4 'HI' Indicator Lamp Output

E

LT GRN/BLK

1563

2 'HI' Indicator Lamp Output

F

PNK

1561

4WD Indicator Lamp Output

G

BLK

150

Ground

H

GRY

8

IP Lamp Feed

Automatic Transfer Case Select Switch, Connector C2


Object Number: 204352  Size: CH

Connector Part Information

    • 12045813
    • CONN 4F M/P 150 (BLACK)

Pin

Wire Color

Circuit No.

Function

A

--

--

Not Used

B

PPL/WHT

1382

LED Dimming Signal

C

BRN

241

Use Output - Ignition 3 - Type III Fuse

D

BRN

1560

Neutral Indicator Lamp Output

Front Axle Actuator


Object Number: 38608  Size: CH

Connector Part Information

    • 12077591
    • ASM 5F M/P 150 (BLACK)

Pin

Wire Color

Circuit No.

Function

A

BLK/WHT

1695

4WD Front Wheel Lock Telltale Feed

B

GRY/BLK

1570

Front Axle Actuator Output

C

BRN

241

Fuse Output - Ignition 3 - Type II Output

E

BLK

150

Ground