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How do I fix a malfunctioning rearview mirror in my 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/How do I fix a malfunctioning rearview mirror in my 2020 Toyota Highlander?

How do I fix a malfunctioning rearview mirror in my 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
587 words

Problem Statement

Learn how to diagnose and fix a malfunctioning rearview mirror in your 2020 Toyota Highlander with step-by-step instructions.

Affected Component
rearview mirror
Estimated Time
2 hours

Symptoms

  • •Mirror Not Adjusting
  • •Dim or Flickering Display
  • •No Display at All
  • •Physical Damage

Diagnostic Steps

  1. 1
  2. 2
  3. 3
  4. 4
  5. 5
  6. 6
  7. 7
  8. 8

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

  • •Multimeter
  • •Fuse puller or needle-nose pliers
  • •Screwdriver set
  • •Trim removal tool
  • •Torque wrench

Additional Information

Affected Component
rearview mirror
Estimated Time
2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Fixing a Malfunctioning Rearview Mirror in a 2020 Toyota Highlander

Step 1: Visual Inspection
  1. Check for Physical Damage: Inspect the mirror for cracks or loose mounting.
  2. Inspect Wiring: Look for any exposed or damaged wiring at the base of the mirror.
Step 2: Check Power Supply
  1. Turn On Ignition: Ensure the vehicle is in the "On" or "Run" position.
  2. Test Power to Mirror: Use a multimeter to check for voltage at the mirror’s electrical connector. You should see around 12V.
    • Tools Required: Multimeter
    • Procedure: Disconnect the mirror from its mount, and probe the connector with the multimeter.
Step 3: Functionality Test
  1. Adjust the Mirror: If equipped with electronic adjustment, try adjusting the mirror using the controls.
  2. Check Auto-Dimming Feature: If the mirror has this feature, cover the sensor on the front of the mirror to see if it dims.
Step 4: Check Fuses
  1. Locate the Fuse Box: Refer to the owner’s manual for the exact location of the fuse box, typically found under the dashboard or in the engine compartment.
  2. Inspect Fuses: Check the fuses related to the interior lights, mirrors, and electrical accessories.
    • Tools Required: Fuse puller or needle-nose pliers
    • Procedure: Remove the corresponding fuse and visually inspect it. Replace if blown.
Repair Instructions
Step 1: Replacing the Rearview Mirror

If diagnostics indicate that the mirror itself is malfunctioning or if physical damage is present, follow these steps to replace it.

Required Tools and Materials

  • New rearview mirror (OEM or compatible)
  • Screwdriver set (Phillips and flathead)
  • Trim removal tool (optional)
  • Torque wrench (if specified)

Installation Steps

  1. Remove the Old Mirror:

    • Detach Wiring: Carefully disconnect the wiring harness from the back of the mirror.
    • Remove Mounting Screws: Use a screwdriver to unscrew the mirror from its mount.
    • Take Off the Mirror: Gently pull the mirror away from the windshield.

  2. Install the New Mirror:

    • Position the New Mirror: Align the new mirror with the mounting bracket.
    • Secure the Mirror: Reinstall the screws and tighten them securely but avoid overtightening, which could crack the glass.
    • Reconnect Wiring: Plug the wiring harness back into the new mirror.

  3. Recheck Functionality:

    • Test the adjustment functions and the auto-dimming feature (if applicable).
    • Ensure the mirror is stable and properly aligned.
Step 2: Final Checks
  • Ensure all tools are removed from the vehicle.
  • Clean the new mirror surface to remove any fingerprints or smudges.
  • Test drive the vehicle to ensure the mirror operates as intended under various conditions.
Conclusion

If the mirror still does not function properly after replacement or the issue persists, it may be necessary to check for more complex electrical issues, including wiring harness problems or issues with the vehicle’s body control module. In such cases, consulting with a professional technician or your dealership may be advisable.