GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saturn 🢒 2004 🢒 L300/LW300 🢒 DTC 🢒 DTC B3109

Circuit Description

The low battery detection is handled inside the transmitter. The transmitter sends a battery condition signal to the integrated body control module (IBCM) when the transmitter buttons are pressed.

Conditions for Setting the DTC

This code shall be set after 3 consecutive low battery signals from the same programmed transmitter.

Conditions for Clearing the DTC

This code is cleared as current when a normal transmitter voltage signal is received from any programmed transmitter.

Test Description

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

  1. Diagnostic system check

    2.

  2. 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.

Step

Action

Yes

No

Schematic Reference: Keyless Entry Schematics

1

Did you perform the Remote Keyless Entry Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - Remote Keyless Entry

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. Select the body control module 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 battery(s) on the indicated transmitters. Refer to Transmitter Battery Replacement .

Did you complete the battery(s) replacement?

Go to Step 4

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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

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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

Important: When replacing the integrated body control module (IBCM), perform the transmitter reprogramming procedure.

Replace the IBCM. Refer to Body Control Module Replacement in Body Control System.

Did you complete the replacement?

System OK

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