GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2007 🢒 TopKick C-Series (Conventional) C4/C5 🢒 Driveline/Axle 🢒 Rear Drive Axle 🢒 Rear Axle Connector End Views
Connector 1: Differential Lock Switch (HNB/HPL/HPN)
Connector 2: Inter-Axle Differential Lock Switch (Tandem Axle)

Differential Lock Switch (HNB/HPL/HPN)
Object Number: 646148 Size: CH

Connector Part Information

  • OEM: 12020599
  • Service: 12102664
  • Description: 2-Way F Metri-Pack 280 Series (BK)

Terminal Part Information

  • Terminal/Tray: 12077411/2
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)

Differential Lock Switch (HNB/HPL/HPN)

Pin

Wire Color

Circuit No.

Function

A

L-GN

2659

Rear Differential Lock-High-Control

B

BK

750

Ground

Inter-Axle Differential Lock Switch (Tandem Axle)
Object Number: 646148 Size: CH

Connector Part Information

  • OEM: 12020599
  • Service: 12102664
  • Description: 2-Way F Metri-Pack 280 Series (BK)

Terminal Part Information

  • Terminal/Tray: 12077411/2
  • Core/Insulation Crimp: 2/5
  • Release Tool/Test Probe: 12094430/J-35616-4A (PU)

Inter-Axle Differential Lock Switch (Tandem Axle)

Pin

Wire Color

Circuit No.

Function

A

L-GN

2659

Rear Differential Lock-High-Control

B

BK

750

Ground