It’s a familiar frustration: you reach for your Dodge Dart key fob, press a button, and… nothing. Before you assume the worst, consider the simplest solution first – the battery. Like any electronic device, your key fob relies on a battery to function, and knowing how to address battery issues is the first step in maintaining your keyless entry system. While a dead battery is often the culprit, for Dodge Dart owners, the situation can sometimes be a bit more complex.
Common Signs Your Dodge Dart Key Fob Battery Might Be Dying
Before diving into replacements or repairs, recognizing the symptoms of a low or dead key fob battery can save you time and hassle. Here are some typical signs to watch for:
- Reduced Range: You need to be much closer to your Dodge Dart than usual for the key fob to lock or unlock the doors.
- Intermittent Functionality: The buttons on your key fob work sometimes, but not consistently. You might need to press them multiple times.
- Weak Signal Indicator: Some Dodge Dart models might display a warning message on the dashboard indicating a low key fob battery.
- No Response at All: In the most obvious case, pressing any button on your key fob results in absolutely no response from your vehicle.
If you’re experiencing any of these issues, replacing the battery is a logical first step.
Step-by-Step Guide to Replacing Your Dodge Dart Key Fob Battery
Fortunately, replacing the battery in a Dodge Dart key fob is usually a straightforward process you can do yourself. Here’s how:
- Identify Your Key Fob Type: Dodge Dart key fobs can vary slightly depending on the year and trim. However, most use a similar design. Look for a small indentation or release button on the fob.
- Open the Key Fob Casing: Use a small flathead screwdriver or your fingernail to gently pry open the key fob casing at the indentation. Be careful not to apply excessive force, as you could damage the plastic.
- Locate the Battery: Once open, you’ll see the battery inside. It’s typically a small, round, silver button cell battery.
- Note the Battery Type: Before removing the old battery, check the battery type. Dodge Dart key fobs commonly use a CR2032 battery. Make sure you purchase the correct replacement.
- Remove the Old Battery: Gently remove the old battery. You might be able to pry it out with your fingernail or the small screwdriver.
- Insert the New Battery: Install the new CR2032 battery, ensuring the positive (+) side is facing upwards, as indicated by the markings inside the key fob casing.
- Reassemble the Key Fob: Carefully snap the key fob casing back together until it’s securely closed.
- Test the Key Fob: Try using your key fob to lock and unlock your Dodge Dart to ensure the new battery has resolved the issue.
When It’s Not Just the Battery: Understanding the RFHM
If you’ve replaced the battery and your Dodge Dart key fob is still not working correctly, the problem might be more complex than just a power source issue. In some cases, the Radio Frequency Hub Module (RFHM) could be the culprit.
The RFHM is an electronic control module responsible for receiving signals from your key fob and communicating with other vehicle systems to perform actions like locking/unlocking doors, starting the engine, and activating the alarm. If the RFHM is failing, it can lead to key fob malfunction even with a fresh battery.
Symptoms of a potential RFHM issue can sometimes overlap with battery problems, such as intermittent or no response from the key fob. However, if battery replacement doesn’t solve the problem, RFHM failure becomes a more likely possibility.
RFHM Replacement – Is It a DIY Job?
Replacing the RFHM is significantly more complex than changing a key fob battery. It typically requires specialized diagnostic tools and programming to integrate the new module with your Dodge Dart’s electronic system. According to factory service manual procedures, RFHM replacement often involves:
- Diagnostic Scan Tool: A professional-grade scan tool is needed to communicate with the vehicle’s computer system and perform the RFHM replacement routine.
- DealerCONNECT Login and PIN: Access to DealerCONNECT (Chrysler’s dealer network system) and a temporary PIN are usually required for security and programming purposes.
- PROXI Configuration Alignment: This procedure ensures all electronic modules in your vehicle are correctly configured and communicating after RFHM replacement.
- Key Fob Programming: After replacing the RFHM, you’ll need to reprogram your existing key fobs to work with the new module.
While some experienced DIYers with access to tools like alfaOBD might attempt RFHM replacement themselves, it’s generally recommended to seek professional assistance from a qualified mechanic or Dodge dealership for this type of repair. Incorrect procedures can lead to further issues with your vehicle’s electrical system.
RFHM Programming Procedure (Summary from Original Article)
The original article provided a summary of the RFHM programming procedure from the factory service manual:
- Connect Diagnostic Scan Tool: Connect a diagnostic scan tool to your Dodge Dart’s Data Link Connector (DLC).
- Navigate to RF-Hub (RFH): Use the scan tool to navigate to the RF-Hub module in the vehicle view.
- Perform “RF-HUB Replace” Routine: Select the “RF-Hub” and run the “RF-HUB Replace” routine in the scan tool. This step often requires a DealerCONNECT login and PIN.
- Perform “PROXI Configuration Alignment” Routine: Select “Misc. Function” and run the “PROXI Configuration Alignment” routine.
- Program Ignition FOBIKs: Place all key fobs inside the vehicle and use the scan tool to select “Program ignition FOBIKs” in the Miscellaneous Functions menu, following on-screen instructions.
- BCM Update (Tire Pressure): After key fob programming, use the scan tool to access the BCM (Body Control Module) and update tire pressure values and program tire sensor IDs.
- Final Checks: Turn the ignition off, wait 30 seconds, and then turn it back on. Check for any RF-Hub Diagnostic Trouble Codes (DTCs). Verify that all key fobs are working correctly.
This procedure highlights the complexity of RFHM replacement and the need for specialized tools and information.
Conclusion
When your Dodge Dart key fob stops working, replacing the battery is the first and easiest troubleshooting step. For many owners, this simple fix will restore key fob functionality. However, if a new battery doesn’t solve the problem, a failing RFHM could be the underlying issue. RFHM replacement and programming are complex procedures best left to qualified professionals. Understanding the difference between a simple battery issue and a potential RFHM problem can help you effectively diagnose and address key fob problems with your Dodge Dart.
