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How do I fix the keyless entry system not working on my Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix the keyless entry system not working on my Highlander?

How do I fix the keyless entry system not working on my Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
645 words

Problem Statement

Learn how to diagnose and fix the keyless entry system issues on your 2020-present Toyota Highlander with our step-by-step guide.

Affected Component
Keyless Entry System
Estimated Time
1-2 hours

Symptoms

  • •Key Fob Not Responding
  • •No Response from Door Handles
  • •Indicator Light
  • •Battery Issues

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

  • ✓Test the affected component to ensure it functions correctly
  • ✓Check for any error codes or warning lights
  • ✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • •OBD-II Scanner
  • •Multimeter
  • •Screwdriver Set
  • •Replacement Battery
  • •Owner’s Manual

Additional Information

Affected Component
Keyless Entry System
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation

Fixing the Keyless Entry System on a 2020-present Toyota Highlander (XU70)

Tools Required
  • OBD-II Scanner: For reading error codes.
  • Multimeter: To check the battery voltage.
  • Screwdriver Set: For removing the key fob if needed.
  • Replacement Battery: CR2032 or CR2025.
  • Owner’s Manual: For specific instructions and specifications.
Repair Instructions
Step 1: Replace the Key Fob Battery

  1. Open the Key Fob:

    • Use a small screwdriver to gently pry apart the two halves of the key fob.
    • Be careful not to damage the plastic casing.

  2. Remove the Old Battery:

    • Take note of the battery orientation (positive and negative).
    • Remove the old battery and dispose of it properly.

  3. Insert the New Battery:

    • Place the new battery into the compartment, ensuring the orientation matches the original.

  4. Reassemble the Key Fob:

    • Snap the two halves of the key fob back together until secure.
Step 2: Reprogram the Key Fob

  1. Enter Programming Mode:

    • Follow the steps outlined in the diagnostic section to enter key fob programming mode.

  2. Test the Key Fob:

    • After programming, test the key fob by attempting to lock/unlock the doors.
Step 3: Check Vehicle Systems

  1. Connect OBD-II Scanner:

    • Plug the OBD-II scanner into the vehicle's diagnostic port (usually located under the dashboard).

  2. Scan for Codes:

    • Follow the scanner instructions to read any error codes.
    • If any codes related to the keyless entry system appear, look them up for diagnosis.
Step 4: Inspect Wiring and Connections

  1. Access BCM:

    • If issues persist, the Body Control Module may be faulty.
    • Remove the necessary panels to access the BCM (refer to your owner’s manual for specific access points).

  2. Check Connections:

    • Inspect the wiring and connectors for damage or corrosion.
    • Ensure all connectors are firmly seated.

  3. Test BCM:

    • If you have the expertise, test the BCM with a multimeter or consult a professional if faulty.
Conclusion

If after these steps the keyless entry system is still not functioning, it may require professional diagnosis or replacement of the key fob or Body Control Module. Always refer to your vehicle's service manual for specific details and procedures.