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How do I fix the problem of the automatic headlights not working in my 2020 Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix the problem of the automatic headlights not working in my 2020 Highlander?

How do I fix the problem of the automatic headlights not working in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
601 words

Problem Statement

Learn how to diagnose and fix the automatic headlights issue on your 2020 Toyota Highlander with step-by-step instructions.

Affected Component
automatic headlights
Estimated Time
2 hours

Symptoms

  • •Automatic headlights not functioning

Diagnostic Steps

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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

  • •Fuse puller or needle-nose pliers
  • •Multimeter
  • •Vehicle owner’s manual
  • •Basic tools for removing components
  • •OBD-II scanner

Additional Information

Affected Component
automatic headlights
Estimated Time
2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Problem Overview

Symptom: Automatic headlights on a 2020 Toyota Highlander are not functioning.
Possible Causes: Faulty headlight sensor, blown fuse, wiring issues, or malfunctioning Body Control Module (BCM).

Step 1: Visual Inspection

  1. Check Headlight Operation:

    • Manually turn on the headlights using the headlight switch. Verify that both headlights illuminate.

  2. Inspect the Headlight Sensor:

    • Locate the headlight sensor, typically found on the dashboard near the windshield.
    • Check for any obstructions, dirt, or damage to the sensor.

  3. Examine the Wiring:

    • Look for any visible damage or corrosion in the wiring connected to the headlight assembly and sensor.

Step 2: Check the Fuse

  1. Tools Required:

    • Fuse puller or needle-nose pliers
    • Multimeter (for testing continuity)
    • Vehicle owner’s manual

  2. Locate the Fuse Box:

    • Open the driver-side door and locate the fuse box under the dash or in the engine compartment (refer to the owner’s manual for exact location).

  3. Identify the Headlight Fuse:

    • Use the diagram on the fuse box cover or the owner’s manual to identify the specific fuse for the headlights.

  4. Inspect the Fuse:

    • Remove the headlight fuse using the fuse puller.
    • Visually inspect the fuse for any breakage. If it looks intact, use a multimeter to check for continuity.

  5. Replace the Fuse:

    • If the fuse is blown, replace it with a new fuse of the same amperage rating.

Step 3: Test the Headlight Sensor

  1. Tools Required:

    • Multimeter
    • Basic tools for removing components (screwdrivers, etc.)

  2. Access the Sensor:

    • Depending on the vehicle design, you may need to remove trim panels to access the headlight sensor.

  3. Check the Sensor:

    • Disconnect the sensor's electrical connector and use a multimeter to check the output voltage.
    • With the ignition on (but engine off), cover the sensor to simulate darkness and check for a voltage change indicating it is functioning.

  4. Replace the Sensor:

    • If the sensor does not change voltage or is faulty, replace it with a new one.

Step 4: Check the Body Control Module (BCM)

  1. Tools Required:

    • OBD-II scanner

  2. Scan for Codes:

    • Connect the OBD-II scanner to the vehicle’s diagnostic port.
    • Check for any trouble codes related to the headlights or BCM.

  3. Reset the BCM:

    • If applicable, reset the BCM using the scanner and observe if the headlights resume automatic functionality.
Repair Instructions

Step 1: Replacing the Headlight Sensor

  1. Remove the Old Sensor:

    • Disconnect the wiring harness from the sensor.
    • Unscrew or unclip the sensor from its mounting location.

  2. Install the New Sensor:

    • Secure the new sensor in place and reconnect the wiring harness.

  3. Test the System:

    • Start the vehicle and test the automatic headlights by putting the headlight switch in the ‘AUTO’ position and observing functionality.

Step 2: Replacing the Fuse

  1. Install the New Fuse:

    • Insert the new fuse into its slot securely.

  2. Reassemble the Fuse Box:

    • Close the fuse box cover and ensure it is securely latched.

Step 3: Rechecking the System

  1. Final Test:
    • After all repairs are made, test the automatic headlights in different lighting conditions to ensure they are functioning properly.
Conclusion

If the automatic headlights still do not work after performing these steps, further diagnosis of the vehicle's wiring harness or BCM may be necessary. In such cases, consulting with a professional automotive technician or visiting a Toyota dealership may be advisable for in-depth diagnostics and repairs.