FAULTBASE
Error CodesASKCars
© 2026 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
How can I troubleshoot the automatic headlights not functioning in my 2020 Toyota Camry? - Toyota Camry
Home/Cars/Toyota/Camry/XV70 (2018-2024)/How can I troubleshoot the automatic headlights not functioning in my 2020 Toyota Camry?

How can I troubleshoot the automatic headlights not functioning in my 2020 Toyota Camry?

Toyota Camry XV70 (2018-2024)

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

Problem Statement

Learn how to troubleshoot and fix automatic headlights not functioning in your 2020 Toyota Camry with our step-by-step guide.

Affected Component
automatic headlights
Estimated Time
1-2 hours

Symptoms

  • •Automatic headlights do not turn on or off as expected.
  • •Headlight switch appears to be functioning but does not trigger automatic mode.
  • •Dashboard indicator for headlights may not illuminate.
  • •Headlights may work normally when switched manually, but not automatically.

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

  • •Fuse puller or needle-nose pliers
  • •multimeter
  • •OBD-II scanner
  • •wiring diagram for the BCM

Additional Information

Affected Component
automatic headlights
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
4 items

Related Faults

Loading...

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation

Troubleshooting Automatic Headlights Not Functioning in a 2020 Toyota Camry

Symptoms:

  • Automatic headlights do not turn on or off as expected.
  • Headlight switch appears to be functioning but does not trigger automatic mode.
  • Dashboard indicator for headlights may not illuminate.
  • Headlights may work normally when switched manually, but not automatically.
Step 1: Visual Inspection
  • Tools Required: None
  • Instructions:
    1. Inspect the headlight switch on the steering column. Ensure it is set to the "Auto" position.
    2. Check for any visible damage to the headlight housing or the wiring harness.
    3. Look for any blown fuses in the fuse box related to the headlights.
Step 2: Check Fuses
  • Tools Required: Fuse puller or needle-nose pliers, multimeter.
  • Instructions:
    1. Locate the fuse box. For the 2020 Toyota Camry, it’s usually found under the dashboard on the driver’s side or in the engine compartment.
    2. Refer to the owner’s manual for the specific fuse related to the automatic headlights (typically labeled as “Headlight” or “Auto Headlight”).
    3. Remove the fuse and inspect it visually. If the filament is broken, replace it with a new fuse of the same amperage.
    4. If you have a multimeter, test the fuse for continuity to confirm it is functioning.
Step 3: Scan for Error Codes
  • Tools Required: OBD-II scanner.
  • Instructions:
    1. Connect the OBD-II scanner to the vehicle’s diagnostic port, usually located under the dashboard.
    2. Turn the ignition to the ON position without starting the engine.
    3. Scan for any error codes related to the lighting system. Note any codes and research their meanings.
    4. Clear any codes, if applicable, and see if the issue persists.
Step 4: Test the Light Sensor
  • Tools Required: Multimeter.
  • Instructions:
    1. The automatic headlights rely on a light sensor usually located on the dashboard. Locate the sensor (often near the rearview mirror).
    2. Disconnect the sensor connector and use a multimeter to check for voltage. Reference the service manual for the correct voltage specifications.
    3. If no voltage is present, trace the wiring back to the body control module (BCM) for any breaks or shorts.
    4. If voltage is present, check the sensor’s operation by covering it and observing if the headlights engage.
Step 5: Check the Body Control Module (BCM)
  • Tools Required: Wiring diagram for the BCM, multimeter.
  • Instructions:
    1. Locate the BCM, typically found under the driver's side dash.
    2. Refer to the wiring diagram and verify that the BCM is receiving power and grounding properly.
    3. Check the output signals from the BCM to the headlight relay. Use a multimeter to confirm that the BCM is sending signals when the light sensor detects low light conditions.
    4. Look for any signs of corrosion on the connectors and clean them if necessary.
Repair Instructions
Step 6: Repair or Replace Components

  • If the Fuse is Blown:

    1. Replace the blown fuse with a new one of the same amperage.

  • If the Light Sensor is Faulty:

    1. Replace the light sensor based on the manufacturer's specifications. Reconnect the harness and test the system.

  • If the BCM is Malfunctioning:

    1. If the BCM is faulty and not sending proper signals, it may need reprogramming or replacement. This often requires dealer assistance or a specialized technician.
Step 7: Final Testing
  1. After performing repairs, turn the ignition to the ON position and set the headlight switch to "Auto".
  2. Test the automatic headlights by covering the light sensor to simulate low light conditions.
  3. Verify that the headlights turn on automatically and turn off when light returns.
Additional Notes:
  • Always refer to the vehicle’s service manual for specific wiring diagrams and specifications.
  • If the issue persists after these steps, consider consulting with a professional technician for further diagnosis.