How do I troubleshoot the keyless entry system on my Ford Explorer 2020?

Troubleshooting the Keyless Entry System on a 2020 Ford Explorer

Tools Required

• OBD-II Scanner
• Multimeter
• Flathead screwdriver
• Phillips screwdriver
• Key fob battery (CR2032 or appropriate for your model)
• Owner's manual for reference

Step 1: Inspect the Key Fob

1. Visual Inspection: Check for any physical damage on the key fob, such as cracks or signs of wear.
2. Battery Check: Open the key fob using a flathead screwdriver to avoid damage. Remove the battery and check for corrosion or damage.
3. Replace Battery: If the battery is weak or corroded, replace it with a new one (CR2032 is common). Ensure correct polarity when inserting the new battery.

Step 2: Test the Key Fob

1. Key Fob Functionality: Stand near the vehicle and press the lock/unlock buttons on the key fob. Watch for response from the vehicle (e.g., lights flashing, horns).
2. Use Multimeter: Set the multimeter to measure voltage. While pressing the button on the key fob, measure the voltage of the battery. A reading of less than 3 volts indicates a weak battery.

Step 3: Check for Interference

1. Environmental Factors: Ensure you are not near electronic devices that could interfere with the key fob signal, such as cell phones, Wi-Fi routers, or other vehicles.
2. Distance Test: Try using the key fob from different distances to see if the issue persists.

Step 4: Vehicle Diagnostics

1. OBD-II Scanner: Connect the OBD-II scanner to the vehicle’s diagnostic port (usually located under the dashboard near the driver’s seat).
2. Scan for Codes: Check for any diagnostic trouble codes (DTCs) related to the keyless entry system or body control module (BCM). Note any codes found.

Repair Instructions

Step 1: Key Fob Replacement (If Necessary)

1. Purchase New Key Fob: If the key fob is determined to be faulty, purchase a new key fob that is compatible with the 2020 Ford Explorer.
2. Program New Key Fob: Follow the owner's manual instructions for programming the new key fob. Typically, this involves:
   • Inserting the key into the ignition and turning it to the 'On' position (do not start).
   • Pressing the lock button on the new key fob within a certain timeframe (usually 10 seconds) to enter programming mode.

Step 2: BCM Reset (If Necessary)

1. Disconnect Battery: Disconnect the negative terminal of the battery and wait for approximately 10 minutes. This can reset the BCM.
2. Reconnect Battery: Reconnect the negative terminal and check if the keyless entry system begins functioning properly.

Step 3: Addressing DTCs (If Found)

1. Diagnose Codes: If DTCs were found, refer to the service manual and troubleshoot based on the specific codes related to the keyless entry system.
2. Repair: This may involve inspecting wiring, connectors, or replacing the BCM if indicated by the codes.

Final Checks

• After all repairs or replacements, test the keyless entry system again by standing within range and observing its functionality.
• If problems persist, consider consulting a professional technician or contacting Ford customer support for assistance.

Conclusion

By following the above steps, you should be able to diagnose and repair the keyless entry system on your 2020 Ford Explorer. Always ensure safety and follow proper procedures when working with electronic systems in vehicles.