Replacing the battery in your 2007 Nissan Altima key fob should be a straightforward task, but sometimes it can lead to unexpected issues. Many 2007 Altima owners find themselves facing problems after a key fob battery change, even when using the correct CR2032 battery. This article addresses two common problems encountered after replacing your 2007 Altima Key Fob Battery and provides simple solutions to get your key fob working correctly again.
Issue #1: “Invalid Key ID” or “No Key Detected” Messages After Battery Change
One frustrating issue that can arise after a 2007 Altima key fob battery replacement is the appearance of “Invalid Key ID” or “No Key Detected” messages on your dashboard. Additionally, you might find that the door request buttons on your Altima no longer function. Interestingly, the remote functions of the key fob, such as locking and unlocking the doors remotely, might still work. You can also typically start the car by physically pressing the start button with the key fob itself.
Solution: Re-syncing your 2007 Altima Key Fob
This issue often indicates a need to resynchronize your key fob with your Nissan Altima after the battery replacement. Here’s how to do it:
- Remove the Backup Key: Take out the mechanical backup key from your 2007 Altima key fob.
- Enter and Position the Key Fob: Get into your Nissan Altima and keep the key fob inside the vehicle.
- Enter ACC/ON Mode (No Brake): Press the start button twice without pressing the brake pedal. This will cycle the ignition to the ACC and then ON positions.
- Exit and Lock with Manual Key: Get out of your Altima, taking only the backup door key with you, and close the driver’s side door. Use the backup key to manually lock the driver’s door by turning the key to the left in the door lock cylinder. You should hear the locking mechanism engage.
- Unlock with Manual Key: Immediately turn the key to the right to unlock the driver’s door. Again, you should hear the unlocking mechanism.
- Re-enter and Turn Off: Re-enter your 2007 Altima. Press the start button one more time (again, without pressing the brake) to turn the ignition to the OFF mode.
After completing these steps, the “Invalid key ID” or “No Key Detected” messages should disappear, and all key fob functions, including door request buttons, should be working normally on your 2007 Nissan Altima.
Issue #2: Remote Functions Not Working After 2007 Altima Key Fob Battery Replacement
In contrast to the first issue, you might encounter a problem where everything seems normal after a 2007 Altima key fob battery change except for the remote button functions. In this scenario, you can start your car and use the door request buttons, but the remote lock, unlock, panic button, and remote trunk release (if equipped on your 2007 Altima) will not respond.
Solution: ECU Reboot for Key Fob Re-programming
This problem usually indicates that the push-button functions of your 2007 Altima key fob need to be reprogrammed. This can be achieved by performing a cold reboot of your car’s Engine Control Unit (ECU) with the key fob inside the vehicle.
- Locate the Battery: Open the hood of your 2007 Nissan Altima and locate the main car battery.
- Disconnect the Battery: Using a wrench, disconnect the negative battery cable from the car battery.
- Wait: Wait for one to two minutes. This allows the ECU to fully discharge and reset.
- Reconnect the Battery: Reconnect the negative battery cable to the car battery and tighten the connection.
When you reconnect the battery, the ECU will undergo a cold boot. If your 2007 Altima key fob is inside the car during this process, the push-button remote functions should be automatically reprogrammed. Be aware that disconnecting the car battery might reset the ECU’s learned settings, potentially causing a slightly different idle for a short period after rebooting. This is normal and should resolve itself after driving for a few miles.
Key Fob Battery Type: CR2032 and CR2025
For your 2007 Nissan Altima key fob battery replacement, the recommended battery is a CR2032. While a CR2025 battery, which is slightly thinner, can also work, it has a lower capacity and might not last as long as the CR2032. It’s always best to use the recommended CR2032 battery for optimal performance and longevity of your 2007 Altima key fob.
Reprogramming Both Key Fobs Simultaneously
If you have two key fobs for your 2007 Nissan Altima and need to perform either of these reprogramming procedures, it’s reported that you can reprogram both key fobs at the same time. Simply leave both key fobs inside the car when performing either the resync procedure or the ECU reboot. While not always necessary, this can be a time-saving step if you are experiencing issues with multiple key fobs after battery replacement.
By following these troubleshooting steps, you should be able to resolve common issues encountered after a 2007 Altima key fob battery replacement and ensure your key fob is functioning correctly. Replacing your 2007 Altima key fob battery should now be a less daunting task.
