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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 19 (KEYLESS ENTRY SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B3109TEST DESCRIPTION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Test Description

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Test Description
WARNING: This page is about a different car, the 2005 Saturn L300. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 1:  Diagnostic System Check
  2. 2:  This step checks DTC status as current or history in Remote Function Actuation Menu on scan tool.
  3. 3:  This step identifies the key fob #, transmitter, with a low battery signal.
  4. 4:  This step verifies that the battery replacement corrected the fault.
DTC B3109 Diagnostic Procedures

Step Action Yes No
Schematic Reference: Keyless Entry Schematics 
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 body control module (BCM) display DTCs function on the scan tool.
Does the scan tool display DTC B3109 as a current DTC?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3 
  1. With a scan tool, observe the Key Fob Low Voltage parameters for each transmitter in the door lock information data list to identify the programmed transmitter that set the code.
  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 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 connection 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 is 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 scan tool in order to clear the DTCs.
  2. Operate the replacement transmitters 3 consecutive times.
Does the DTC reset?		 Go to Step 8  System OK
8 Replace the integrated body control module (IBCM). Refer to Control Module References in Computer/Integrating Systems 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.