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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSKEYLESS ENTRY SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3109TEST DESCRIPTION
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Test Description

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. 3:  This step identifies the key fob # (transmitter) with a low battery signal.
  2. 4:  This step verifies that the battery replacement corrected the fault.
DTC B3109

Step Action Yes No
Schematic Reference: Keyless Entry Schematics 
Connector End View Reference: Keyless Entry Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the display DTC function on the scan tool in the remote function actuation menu.
Does the scan tool indicate that DTC B3109 is current?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 
  1. With the scan tool, observe the Key Fob Low Voltage parameters for each transmitter in the Key FOB Information data list to identify the programmed transmitters that set the DTC.
  2. Replace the batteries on the indicated transmitters. Refer to Transmitter Battery Replacement .
Did you complete the batteries replacement?		 Go to Step 4  -
4 
  1. Use the scan tool in order to clear the DTCs.
  2. Operate for 3 consecutive times the transmitters that had the battery replaced.
Does the DTC reset?		 Go to Step 5  System OK
5 Inspect for poor connections at the battery connections of the transmitters that set the DTC.
Did you find and correct the condition?		 System OK Go to Step 6 
6
  1. Replace the transmitters.
  2. Ensure that the replacement transmitters are the correct model for the vehicle.
  3. All transmitters must be programmed at the same time. Refer to Transmitter Programming .
Did you complete the replacement?		 Go to Step 7  -
7
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the replaced transmitters 3 consecutive times.
Does the DTC reset?		 Go to Step 8  System OK
8 Replace the remote control door lock receiver (RCDLR). Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 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.