GM Service Manual Online
For 1990-2009 cars only
Connector 1: Differential Lock Control Valve (HNB)
Connector 2: Differential Lock Switch (HNB, HPL or HPN)
Connector 3: Rear Axle Driver Control Switch - Two Speed (HPZ & Automatic Transmission)
Connector 4: Rear Axle Driver Control Switch - Two Speed (HPZ & Manual Transmission)
Connector 5: Rear Axle Shift Motor - Two Speed (HPZ)
Connector 6: Rear Axle Shift Relay - Two Speed (HPZ)

Differential Lock Control Valve (HNB)


Object Number: 68721  Size: CH

Connector Part Information

  • OEM: 15300027
  • Description: 2-Way F Metri-Pack 280 Series, Sealed (BK)

Differential Lock Control Valve (HNB)

Pin

Wire Color

Circuit No.

Function

A

YE/BK

NB02

Differential Lock Solenoid Valve Control

B

BK

NY01

Ground

Differential Lock Switch (HNB, HPL or HPN)


Object Number: 1452809  Size: CH

Connector Part Information

  • OEM: 7323-1660
  • Description: 6-Way F Yazaki (WH)

Differential Lock Switch (HNB, HPL or HPN)

Pin

Wire Color

Circuit No.

Function

1

--

--

Not Used

2

PK

NB01

Ignition 1 Voltage

3

L-GN

NB02

Differential Lock Switch Signal

4-6

--

--

Not Used

Rear Axle Driver Control Switch - Two Speed (HPZ & Automatic Transmission)


Object Number: 237083  Size: CH

Connector Part Information

  • OEM: 7323-5060
  • Description: 6-Way F Yazaki (NA)

Rear Axle Driver Control Switch - Two Speed (HPZ & Automatic Transmission)

Pin

Wire Color

Circuit No.

Function

1

BK

FZ02

Ground

2

WH

FC03

Rear Axle Shift Motor - Two-Speed Control

3-4

--

--

Not Used

5

BK/RD

FC04

Illumination

6

BK

FZ03

Ground

Rear Axle Driver Control Switch - Two Speed (HPZ & Manual Transmission)


Object Number: 339122  Size: CH

Connector Part Information

  • OEM: 7323-2831
  • Description: 3-Way F Yazaki (NA)

Rear Axle Driver Control Switch - Two Speed (HPZ & Manual Transmission)

Pin

Wire Color

Circuit No.

Function

A

GY/BK

FC02

Rear Axle Shift Motor - Two-Speed Control

B

BK

FZ01

Ground

C

--

--

Not Used

Rear Axle Shift Motor - Two Speed (HPZ)


Object Number: 309547  Size: CH

Connector Part Information

  • OEM: 12020737
  • Description: 3-Way M Weather Pack (BN)

Rear Axle Shift Motor - Two Speed (HPZ)

Pin

Wire Color

Circuit No.

Function

A

L-BU

1469

Rear Axle Shift Motor - Two-Speed Control Voltage - High

B

BK

450

Rear Axle Shift Motor - Two-Speed Ground

C

L-GN

1468

Rear Axle Shift Motor - Two-Speed Control Voltage - Low

Rear Axle Shift Relay - Two Speed (HPZ)


Object Number: 39685  Size: CH

Connector Part Information

  • OEM: 12110539
  • Description: 5-Way F Metri-Pack 280 Series Flexlock, Sealed (BK)

Rear Axle Shift Relay - Two Speed (HPZ)

Pin

Wire Color

Circuit No.

Function

30

BN

241

Ignition 1 Voltage

85

BN

241

Ignition 1 Voltage

86

GY/BK

1467

Rear Axle Shift Motor Relay - Two-Speed Control

87

L-BU

1469

Rear Axle Shift Motor - Two-Speed Control Voltage - High

87A

L-GN

1468

Rear Axle Shift Motor - Two-Speed Control Voltage - Low