Kia Sorento Third Generation (2015-2020) key fob not working, what could be wrong?

Kia Sorento Third Generation (2015-2020) Key Fob Not Working

Symptoms

• The key fob does not unlock or lock the doors.
• The engine does not start when the fob is near the ignition.
• You may see a warning message on the dashboard indicating an issue with the key fob.
• The key fob buttons do not respond when pressed.

Possible Causes

1. Dead Key Fob Battery
2. Faulty Key Fob
3. Issues with the Car's Receiver
4. Out of Range
5. Key Fob Programming Issues
6. Electrical Issues within the Vehicle

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Diagnostic Steps

Step 1: Check Key Fob Battery

1. Tools Required: Flathead screwdriver, multimeter (optional).
2. Action: Open the key fob using the flathead screwdriver.
3. Check Battery: Remove the battery and check for corrosion or damage. Use a multimeter to test the battery voltage (should be around 3V for a CR2032 battery).
4. Replace Battery: If the battery is dead or low, replace it with a new one.

Step 2: Test Key Fob Functionality

1. Tools Required: None.
2. Action: Press the buttons on the key fob while standing close to the vehicle.
3. Check Response: If there is no response, try using a second key fob if available.

Step 3: Check Vehicle Receiver

1. Tools Required: Multimeter, wiring diagram for the vehicle.
2. Action: Inspect the vehicle's key fob receiver module. This is typically located under the dashboard or near the steering column.
3. Electrical Check: Using the multimeter, check the power supply to the receiver module.
4. Check Connections: Ensure all wiring and connectors are secure and free from corrosion.

Step 4: Check for Interference

1. Tools Required: None.
2. Action: Move away from potential sources of interference (other electronic devices, radio towers, etc.) and try the key fob again.
3. Test Range: Confirm if the key fob works at a closer distance.

Step 5: Reprogram the Key Fob

1. Tools Required: Vehicle owner’s manual, possibly a scan tool for advanced programming.
2. Action: Follow the programming procedure outlined in the owner's manual:
   • Insert the key into the ignition and turn it to the "ON" position (do not start the engine).
   • Press the lock and unlock buttons simultaneously for about 5 seconds.
   • Turn the key to the "OFF" position and remove it. Test the key fob.
3. If unsuccessful: You may need to use a specialized scan tool to program the key fob, which may require visiting a dealership.

Step 6: Inspect Electrical Systems

1. Tools Required: Multimeter, basic hand tools.
2. Action: Check fuses related to the keyless entry system.
3. Locate Fuse Box: Refer to the owner's manual for the fuse box location and the specific fuses for the keyless entry system.
4. Check Fuses: Replace any blown fuses.

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Repair Instructions

Replacing Key Fob Battery

1. Use the flathead screwdriver to carefully pry open the key fob.
2. Remove the old battery and replace it with a new CR2032 battery, ensuring the correct polarity (+/-).
3. Snap the key fob back together.

Replacing the Key Fob or Receiver Module

1. If determined faulty, purchase a new key fob or receiver module.
2. For the key fob, follow the programming steps as described earlier.
3. For the receiver module:
   • Disconnect the battery to avoid electrical shorts.
   • Remove the old module (usually held by screws or clips).
   • Install the new module, reconnect all wiring, and secure it.
   • Reconnect the battery and test the key fob.

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Conclusion

Following these steps should help diagnose and resolve issues with the Kia Sorento key fob. If the problem persists after completing all diagnostic and repair steps, consult with a professional technician or a dealership for further assistance.