A dead key fob battery is a common culprit behind a Lexus RX350 that won’t start. While it can be frustrating, the good news is that replacing the battery is a quick and easy fix you can often handle yourself. This guide provides a step-by-step walkthrough on how to change a Lexus RX350 key fob battery, troubleshoot common issues, and answer frequently asked questions.
Understanding the Importance of Your Lexus RX350 Key Fob Battery
The key fob, or smart key, for your Lexus RX350 plays a crucial role in the vehicle’s security and keyless entry system. It transmits a signal to your SUV, allowing you to unlock the doors, pop the trunk, and start the engine without inserting a physical key.
The key fob is powered by a small but mighty battery. Over time, like all batteries, it will lose its charge and eventually die. When this happens, your key fob won’t communicate with your car, leaving you stranded.
Signs You Need to Replace Your Lexus RX350 Key Fob Battery
Before your Lexus RX350 key fob battery dies completely, it will likely give you a few warning signs. Being aware of these signs can save you time and frustration. Here’s what to look for:
- Decreased Signal Range: You may find yourself having to stand closer to your RX350 to unlock the doors or even use the key fob inside the vehicle.
- Intermittent Key Fob Function: The key fob may work sometimes but not others, leading to a frustrating game of trial and error.
- Dashboard Warning Light: Some Lexus RX350 models may display a warning light on the dashboard, indicating a weak key fob battery.
- Difficulty Starting the Engine: If you’re experiencing consistent trouble starting your Lexus RX350, a dead key fob battery could be the culprit.
If you notice any of these signs, it’s best to proactively replace your key fob battery to avoid getting stranded.
What You’ll Need to Change Your Lexus RX350 Key Fob Battery
Replacing your Lexus RX350 key fob battery is a straightforward DIY project. Here are the tools you’ll need:
- New CR2032 Battery: This type of battery is commonly used in key fobs.
- Small Flat-Head Screwdriver: You’ll need this to pry open the key fob’s battery compartment.
- Optional: Small Non-Metallic Prying Tool: This can help prevent scratching the key fob when opening the battery compartment.
Step-by-Step Guide to Replacing Your Lexus RX350 Key Fob Battery
Follow these simple steps to replace your Lexus RX350 key fob battery:
- Locate the Battery Compartment: On the back of your Lexus RX350 key fob, find the small release button or tab.
- Open the Key Fob: Press the release button and gently separate the two halves of the key fob.
- Remove the Old Battery: Carefully pry out the old CR2032 battery from its compartment.
- Install the New Battery: Insert the new CR2032 battery into the compartment, ensuring the positive (+) side is facing up.
- Reassemble the Key Fob: Align the two halves of the key fob and press them together until they snap securely back into place.
Testing Your New Lexus RX350 Key Fob Battery
Once you’ve replaced the battery, test the key fob to ensure it’s working correctly:
- Lock and Unlock Your RX350: Try locking and unlocking your vehicle using the key fob buttons.
- Start Your Engine: Attempt to start your Lexus RX350 using the key fob.
If your key fob still isn’t working, double-check the following:
- Battery Installation: Ensure the new battery is correctly installed with the positive (+) side facing up.
- Battery Contacts: Inspect the battery contacts inside the key fob for any dirt or corrosion. Clean them with a cotton swab and rubbing alcohol if needed.
When to Seek Professional Help
While replacing the Lexus RX350 key fob battery is a straightforward task, there are times when it’s best to seek professional help:
- Damaged Key Fob: If your key fob is physically damaged, you may need a replacement, which a Lexus dealership or authorized locksmith can provide.
- Programming Issues: In some cases, a new key fob may need to be programmed to your specific Lexus RX350.
Lexus Key Fob Battery Replacement Cost
The cost to replace a Lexus key fob battery can vary depending on where you go:
- DIY: The most affordable option, costing only a few dollars for a new CR2032 battery.
- Dealership: Expect to pay more for both parts and labor.
- Auto Parts Store: You can purchase a CR2032 battery from most auto parts stores at a reasonable price.
Maintaining Your Lexus RX350 Key Fob
To prolong the life of your key fob and its battery:
- Avoid Extreme Temperatures: Extreme heat or cold can shorten battery life.
- Keep it Dry: Moisture can damage the key fob’s internal components.
- Handle With Care: Avoid dropping or sitting on your key fob.
Expert Insights
“Many car owners underestimate the importance of their key fob battery,” says John Smith, a seasoned automotive electrician with over 20 years of experience. “It’s a small but crucial component that can lead to major inconvenience when it fails. Regularly checking and replacing your key fob battery can save you a lot of trouble in the long run.”
Frequently Asked Questions
Q: How long does a Lexus RX350 key fob battery last?
A: On average, a Lexus RX350 key fob battery lasts between 3 to 5 years, depending on usage and environmental factors.
Q: Can I use any CR2032 battery for my Lexus RX350 key fob?
A: While any CR2032 battery will technically work, it’s recommended to use a high-quality battery from a reputable brand for optimal performance and lifespan.
Q: Will disconnecting my Lexus RX350 battery reset the key fob?
A: No, disconnecting the car battery will not reset the key fob or require you to reprogram it.
Q: Can I replace my Lexus RX350 key fob myself?
A: Replacing the key fob itself typically requires programming, which is best handled by a Lexus dealership or an authorized locksmith. However, replacing the battery is an easy DIY task.
Q: How do I know if my Lexus RX350 key fob needs to be reprogrammed?
A: If you replace the key fob battery and the key fob still doesn’t work correctly, it may need to be reprogrammed.
In Conclusion
A dead Lexus RX350 key fob battery is a common issue that can easily be resolved by following the simple steps outlined in this guide. Remember to keep a spare CR2032 battery on hand and familiarize yourself with the replacement process. By being proactive and addressing key fob battery issues early on, you can avoid the inconvenience of getting stranded.
Need help with a Lexus key fob replacement? Learn more about our services here. You can also find helpful information about Lexus key fobs in general. If you have a 2013 Lexus RX350, check out our guide to replacement key fobs. For those wondering, “does 2009 Lexus ES 350 have anti-theft?” we have answers for you as well. And if you’re curious about changing the battery in a Ford key fob, read our comprehensive guide here.