For 1990-2009 cars

### 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 Descriptors

DTC B3109 00: Keyless Entry Transmitter 1 Low Battery
DTC B3110 00: Keyless Entry Transmitter 2 Low Battery
DTC B3111 00: Keyless Entry Transmitter 3 Low Battery
DTC B3112 00: Keyless Entry Transmitter 4 Low Battery
DTC B3113 00: : Keyless Entry Transmitter 5 Low Battery

### Circuit/System Description

#### With RPO ATG

With each press of a keyless entry transmitter button, a message containing the current battery state of the transmitter is sent to the remote function receiver module, along with the commanded keyless entry function. The remote function receiver module sends this to the body control module (BCM) to determine what action to perform.

#### With RPO ATS

When starting the vehicle, a message containing the current battery state of the transmitter is sent to the keyless entry control module, which then sends the message to the BCM.

### Conditions for Running the DTC

#### With RPO ATG

A keyless transmitter button is pressed.

#### With RPO ATS

Ignition ON.

### Conditions for Setting the DTC

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

### Action Taken When the DTC Sets

The keyless entry system is inoperative.

### Conditions for Clearing the DTC

The DTC is cleared when a normal transmitter voltage signal is received from the programmed transmitter that set the DTC.

### Reference Information

#### Schematic Reference

Remote Function Schematics

#### Connector End View Reference

Component 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

Control Module References for scan tool information

### Circuit/System Verification

Verify none of the following DTCs are set:

• | DTC B3109

• | DTC B3110

• | DTC B3111

• | DTC B3112

• | DTC B3113

⇒ | If any of the DTCs are set, replace the battery in the appropriate keyless entry transmitter. Operate the transmitter 3 consecutive times. If the DTC resets, replace the keyless entry transmitter.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Transmitter Programming

Control Module References for remote function receiver module replacement, setup, and programming