When your 2015 Honda Fit's keyless entry system stops working, you lose the convenience of remote locking and may also be dealing with security system concerns. The problem can originate from the remote fob itself, the vehicle's receiver, or the door lock actuators. Systematic troubleshooting identifies the failure point.
Testing the Remote Fob
Start with the simplest possibility: a dead battery in the key fob. The 2015 Fit uses a CR1616 or CR2032 battery depending on key type. If you notice reduced range before complete failure, battery weakness is likely. Replace the battery first—this solves most keyless entry complaints. Test both fobs if you have two; if both stopped working simultaneously, the issue is likely vehicle-side.
Verifying Fob Function
You can verify a fob is transmitting using a simple test: press the button while watching an AM radio tuned to a quiet frequency, or use a cell phone camera to see the infrared LED flash (some Honda fobs use RF, so this won't work on all). If the fob appears dead even with a new battery, the internal circuit board may have failed—usually from button wear, water exposure, or physical damage.
Receiver Issues
If both fobs fail to operate the locks but work on another similar Honda, the vehicle's keyless entry receiver has likely failed. The receiver module is typically located behind the dashboard and listens for the coded radio signal from your fob. Receiver failure is uncommon but can result from electrical issues, water intrusion, or module failure.
Door Lock Actuator Problems
If you hear the relay click inside the car when pressing the fob but the doors don't lock, the door lock actuators may have failed. You can test by using the interior lock switch—if manual operation also fails, the actuator for that door is likely faulty. Actuator failure is common in older vehicles and happens one door at a time.
Reprogramming and Costs
Sometimes fobs lose their programming and need to be re-paired to the vehicle. Honda dealers can reprogram fobs for $50-$100. Battery replacement is under $10 DIY. A replacement fob from Honda costs $100-$200 plus programming. Aftermarket fobs are cheaper but may have compatibility issues. Door lock actuator replacement runs $150-$300 per door. Receiver module replacement, if needed, costs $200-$400 parts and labor.