GM Service Manual Online
For 1990-2009 cars only

Diagnostic Instructions

    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC B3109: Keyless Entry Transmitter 1 or Generic Low Battery

Circuit/System Description

This fault sets if the key fob programmed to slot 1 has a low battery.

Conditions for Running the DTC

The remote function actuation (RFA) system must be enabled.

Conditions for Setting the DTC

The code sets after 3 consecutive low battery signals from the same programmed transmitter.

Action Taken When the DTC Sets

The RFA system is inoperative.

Conditions for Clearing the DTC

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

Reference Information

Schematic Reference

Remote Function Schematics

Connector End View Reference

Remote Function Connector End Views

Description and Operation

Keyless Entry System Description and Operation

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Scan Tool Data List

Circuit/System Testing

  1. Replace the batteries in the transmitter and with the scan tool clear the DTC.
  2. Operate the transmitter three consecutive times. The DTC should not set.
  3. If the DTC sets again, test the battery.
  4. If all circuits test normal, test or replace the transmitter.

Repair Instructions

Important: This vehicle may be equipped with the 2-Way Advanced Remote Start System. Vehicle equipped with the 2-Way Advanced Remote Start System can be identified by an LCD screen on the keyless entry transmitter or a yellow label on the RCDLR. When servicing the 2-Way Advanced Remote Start System, ensure that the correct parts are installed during replacement. Service parts for the 2-Way Advanced Remote Start System can be found in the Accessory section of the parts manual.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.