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HOMESERVICE MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 358 (LIGHTING SYSTEMS)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B2625: DISPLAY DIMMING PULSE WIDTH MODULATION (PWM) OUTPUT CIRCUITTEST DESCRIPTION
2006 Chevrolet Suburban K2500, 6.0 U

Test Description

2006 Chevrolet Suburban K2500, 6.0 USECTION Test Description
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

  1. 4:  After replacement of the BCM you must calibrate the new module for proper operation.
DTC B2625

Step Action Yes No
Schematic Reference: Interior Lights Dimming Schematics 
Connector End View Reference: Lighting Systems Connector End Views  or Body Control System Connector End Views in Body Control System
1 Did you perform the Lighting System Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Lighting Systems 
2 Test the following circuits for a short to ground:
  • Instrument panel lamps dimming control
  • LED dimming supply
  • Battery positive voltage circuit of BCM from the TBC 2 A fuse

Did you find and correct the condition?		 Go to Step 5  Go to Step 3 
3 Inspect for poor connections at the harness connector of the BCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 5  Go to Step 4 
4 
IMPORTANT: Perform the setup procedure for the BCM.
Replace the body control module (BCM). Refer to Body Control Module Replacement in Body Control System.Did you complete the replacement?		 Go to Step 5  -
5
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC reset?		 Go to Step 2  System OK
RENDER: 1.0x

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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.