Is your Chrysler 300 key fob not working after a battery replacement? You’re not alone. Many Chrysler 300 owners face this issue when attempting a simple DIY fix. This guide, brought to you by the experts at keyfobx.com, will walk you through replacing your Chrysler 300 key fob battery and troubleshoot common problems that may arise afterward.
Replacing your key fob battery should be a straightforward task. Typically, Chrysler 300 key fobs use CR2016 batteries, which are widely available. However, simply swapping out the old battery for a new one doesn’t always guarantee a working key fob. You might find yourself locked out or unable to start your vehicle remotely.
This article addresses the common problem of a Chrysler 300 key fob malfunctioning after a battery replacement. We’ll explore potential causes and provide step-by-step solutions, ensuring you can regain full functionality of your key fob without unnecessary trips to the dealership.
One user in a forum thread described their experience: “I replaced it with 2x CR2016 3V batteries and the keyfob won’t work with any functions (lock/unlock etc). I made sure they were placed in the correct sequence. I double checked it with a multimeter and I got the correct Voltage & mAmp draw. I inserted the old batteries (they weren’t dead but were very weak, had to get up close to unlock car before) and tried it and it still didn’t work. Does the keyfob have volatile memory that got wiped?”
This user’s experience is a classic example of what can go wrong. Let’s delve into the reasons and solutions.
Step-by-Step Guide to Chrysler 300 Key Fob Battery Replacement
Before we troubleshoot, let’s ensure you’ve correctly replaced the battery. Here’s a general guide:
- Identify Your Key Fob Type: Chrysler 300 key fobs can vary slightly depending on the year. However, most use a similar battery replacement process.
- Gather Your Tools: You’ll typically need a small flathead screwdriver or a similar tool to open the key fob casing.
- Open the Key Fob: Locate the small notch on the key fob casing. Gently insert your screwdriver into the notch and twist to pry the casing open. Be careful not to damage the plastic.
- Remove the Old Battery: Once open, you’ll see the battery (or batteries). Note the orientation (+ and – sides). Carefully remove the old battery. In many Chrysler 300 fobs, you’ll find two CR2016 batteries stacked.
- Insert the New Battery: Place the new CR2016 battery (or batteries) in the same orientation as the old one. Ensure they are securely seated in the battery compartment.
- Close the Key Fob: Carefully snap the key fob casing back together until it clicks shut.
Chrysler 300 Key Fob
Troubleshooting: Key Fob Not Working After Battery Change
If you’ve replaced the battery and your Chrysler 300 key fob still isn’t working, here are common issues and solutions:
1. Battery Polarity and Type
- Incorrect Polarity: Double-check that you inserted the new battery in the correct orientation (+ and – sides matching the markings in the fob).
- Wrong Battery Type: Ensure you are using CR2016 batteries. While other CR20XX batteries might fit, using the incorrect type can lead to malfunction or reduced performance. The original forum poster correctly used CR2016 batteries, but it’s a common mistake.
- Dead Battery: Even new batteries can sometimes be defective. Test the new battery with a multimeter to ensure it provides the correct voltage (3V for CR2016).
2. Key Fob Reprogramming
Chrysler 300 key fobs, especially in older models, may lose their programming when the battery is removed for an extended period. This is a key point raised in the forum discussion. While some believe it’s due to volatile memory, it’s more likely a security feature or a result of the system resetting.
Reprogramming with EVIC (Electronic Vehicle Information Center)
Many Chrysler 300 models come equipped with an EVIC, which allows for user programming of key fobs. Here’s how you might attempt reprogramming via EVIC, based on forum user suggestions:
- Enter EVIC Menu: Use the buttons on your steering wheel to navigate to the “Vehicle Settings” or “Customer Programmable Features” menu in your EVIC display.
- Find “Program Remote”: Look for an option like “Program Remote”, “Train Remote”, or similar wording. Select this option.
- Follow On-Screen Prompts: The EVIC will display instructions. A common prompt mentioned in the forum is: “PRESS REMOTE LOCK & UNLOCK THEN PRESS UNLOCK”.
- Simultaneous Button Press: This is where confusion can arise, as noted in the forum. You need to press the “Lock” and “Unlock” buttons on your key fob simultaneously, and then, as prompted, press the “Unlock” button again. The timing might be crucial – try holding the buttons for a second or two.
- Confirmation Chime: If successful, the car should chime, indicating the key fob has been programmed.
An example of a Chrysler 300 EVIC module, which, as discussed in the forum, can sometimes be used to reprogram key fobs after battery replacement.
Important Notes on EVIC Programming:
- Single Remote Programming: Forum users debate whether EVIC can program a remote if no remotes are currently working. Some suggest it’s possible, others believe a working remote is needed to add additional remotes via EVIC. Experimentation might be necessary.
- Procedure Variations: The exact EVIC menu and prompts can vary slightly between Chrysler 300 model years. Consult your owner’s manual for the most accurate instructions for your specific vehicle.
- All Remotes Wiped: Be aware that, as mentioned in the forum and owner’s manuals, initiating the EVIC programming sequence might erase all previously programmed remotes. Therefore, have all your key fobs present if you are attempting this method and want to use multiple fobs.
Dealer Programming
If EVIC programming fails, or if you only have one key fob and it’s not working, you may need to visit a Chrysler dealership or a qualified automotive locksmith for professional programming.
- Professional Equipment: Dealerships and locksmiths have specialized diagnostic tools and equipment to reprogram key fobs directly to your vehicle’s computer system.
- Cost: Dealer programming will typically incur a cost, which can vary. Contact your local dealership for pricing.
- When Necessary: Dealer programming is usually required if:
- You don’t have EVIC.
- EVIC programming fails.
- You’ve lost all key fobs and are replacing them.
3. Timing is Key (Sometimes)
One forum user suggested a quick battery replacement trick: “for next time, when you take the battery out, put it back in within 15 seconds. thats the time it take for it to discharge and loose its memory. otherwise, you will have to reprogram it.”
While not officially documented by Chrysler, this anecdotal evidence suggests that a very brief battery removal might prevent the need for reprogramming in some cases. If you are preemptively replacing a weak battery, this quick swap method might be worth trying.
Preventing Future Key Fob Issues
- Regular Battery Checks: Don’t wait until your key fob completely fails. If you notice decreased range or intermittent operation, replace the battery proactively.
- Use Quality Batteries: Opt for reputable brands of CR2016 batteries to ensure longevity and reliable performance.
- Consider a Spare Fob: As suggested in the forum, having a second programmed key fob is always a good idea. It provides a backup and can simplify adding new remotes in the future (if you have a working fob).
Conclusion
Replacing your Chrysler 300 key fob battery should be a simple maintenance task. However, as this guide and real-world forum experiences illustrate, it can sometimes lead to unexpected issues requiring reprogramming. By following the troubleshooting steps and exploring EVIC programming, you can often resolve the problem yourself. If all else fails, professional dealer or locksmith programming is available to get your key fob working again.
For more automotive DIY guides and expert advice, visit keyfobx.com – your trusted source for car key and remote solutions.
