GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2005 🢒 DeVille 🢒 Accessories 🢒 Navigation Systems 🢒 DTC B3109

Circuit Description

The LOW battery detection is handled inside the transmitter. The transmitter sends a battery condition signal to the remote control door lock receiver (RCDLR) when the transmitter buttons are pressed.

DTC Descriptor

This diagnostic procedure supports the following DTC:

DTC B3109 Keyless Entry Transmitter Low Battery

Conditions for Setting the DTC

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

Action Taken When DTC Sets

The body control module (BCM) stores DTC B3109 in memory.

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 number(s) below refer to the step number(s) on the diagnostic table.

  1. This step identifies the key fob # (transmitter) with a low battery signal.

    2.

  2. This step verifies that the battery replacement corrected the fault.

Step

Action

Yes

No

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 transmitter(s) that set the DTC.
  2. Replace the battery(s) on the indicated transmitter(s). Refer to Transmitter Battery Replacement .

Did you complete the battery(s) replacement?

Go to Step 4

--

4

  1. Use the scan tool in order to clear the DTCs.
  2. Operate for 3 consecutive times the transmitter(s) 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 transmitter(s) that set the DTC.

Did you find and correct the condition?

System OK

Go to Step 6

6
  1. Replace the transmitter(s).
  2. Ensure that the replacement transmitter(s) 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 the scan tool in order to clear the DTCs.
  2. Operate the replaced transmitter(s) 3 consecutive times.

Does the DTC reset?

Go to Step 8

System OK

8

Important: When replacing the remote control door lock receiver (RCDLR), perform the transmitter programming procedure.

Replace the RCDLR. Refer to Control Module References in Computer/Integrating Systems.

Did you complete the replacement?

System OK

--