2006 Hummer H2 4D Utility PickupFACTORY OEM SERVICE PROCEDURE

Body Control Module (BCM) C3

Fig 1: Body Control Module (BCM) C3 Connector End View
GM255037Courtesy of GENERAL MOTORS CORP.
Body Control Module (BCM) C3 Connector Parts Information

Connector Part Information 
  • OEM: 12160778
  • Service: 21025204
  • Description: 24-Way F Micro-Pack 100 Series (BN)
Terminal Part Information 
  • Pins: A4 - A8, A10, A11, B1, B2, B5, B6, B8, B9, B11
  • Terminal/Tray: 12146447/3
  • Core/Insulation Crimp: E/C
  • Release Tool/Test Probe: 12031876-1/J-35616-6 (BN)
Body Control Module (BCM) C3 Connector Terminal Identification

Pin Wire Color Circuit No. Function
A1-A3 - - Not Used
A4 WH 278 Ambient Light Sensor Signal
A5 GY 1548 Passenger Sunload Sensor Signal
A6 YE 1836 Security System Sensor Signal
A7 L-GN 1011 Remote Radio Control Signal
A8 D-GN 588 DRL Switch Signal
A9 - - Not Used
A10 D-GN 113 Windshield Wiper Switch Signal 2
A11 PU 328 Interior Lamp Defeat Switch Signal
A12 - - Not Used
B1 YE 710 Class 2 Serial Data
B2 GY/BK 308 Park Lamp Switch On Signal
B3-B4 - - Not Used
B5 L-BU/BK 590 Driver Sunload Sensor Signal
B6 BK/WH 1851 Ground
B7 - - Not Used
B8 OG/BK 2090 Dimming Input Signal
B9 L-GN 11 Headlamp Dimmer Switch Signal
B10 - - Not Used
B11 L-BU 553 Tow/Haul Switch Signal
B12 - - Not Used
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.