How can I resolve the issue of my 2020 Highlander’s side mirrors not adjusting?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

557 words

Problem Statement

Learn how to diagnose and fix the issue of side mirrors not adjusting on your 2020 Toyota Highlander with our step-by-step guide.

Affected Component

side mirrors

Estimated Time

2-4 hours

Symptoms

•The side mirrors do not move when the adjustment controls are activated.
•No sounds or feedback from the adjustment mechanism.
•Other electrical components (like windows or locks) functioning properly.
•Possible warning lights on the dashboard related to the electrical system.

Diagnostic Steps

1
Check the adjustment switch for any visible damage or debris.
2
Test the switch by trying to adjust both the left and right mirrors.
3
Locate the fuse box and inspect the fuse for continuity.
4
Using a multimeter, check for power at the switch.
5
Inspect the wiring harness that leads to the side mirrors.
6
Disconnect the mirror and apply 12V power to the motor terminals.

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
•Basic hand tools (screwdrivers, pliers, etc.)
•Jumper wires
•Replacement fuses (if necessary)
•Torque wrench (if removing the mirror assembly)

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Diagnostic Steps

1
Check the adjustment switch for any visible damage or debris.
2
Test the switch by trying to adjust both the left and right mirrors.
3
Locate the fuse box and inspect the fuse for continuity.
4
Using a multimeter, check for power at the switch.
5
Inspect the wiring harness that leads to the side mirrors.
6
Disconnect the mirror and apply 12V power to the motor terminals.

Solution

Issue: Side Mirrors Not Adjusting on 2020 Toyota Highlander

Tools Required:

Multimeter
Basic hand tools (screwdrivers, pliers, etc.)
Jumper wires
Replacement fuses (if necessary)
Torque wrench (if removing the mirror assembly)

Repair Instructions:

Replace the Adjustment Switch (if faulty):
- Remove the trim panel around the switch (typically clips or screws).
- Disconnect the wiring harness from the switch.
- Install the new switch by reversing the removal process.
Replace the Fuse (if blown):
- Remove the faulty fuse and replace it with a new one of the same amperage.
- Re-test the adjustment functionality.
Repair Wiring Issues:
- If damaged wiring is found, splice in new wire or repair using solder and heat-shrink tubing.
- Ensure all connections are secure and insulated to prevent future issues.
Replace the Mirror Assembly (if motor is faulty):
- Remove the mirror assembly by unscrewing the mounting screws (may require access to the inside door panel).
- Disconnect the wiring harness from the mirror assembly.
- Install the new mirror by reversing the disassembly steps, ensuring the wires are properly connected.
Final Testing:
- Once repairs are completed, test the side mirrors to ensure they adjust correctly.
- Reassemble any panels or covers removed during the process.

Conclusion:

By following these steps, you should be able to diagnose and resolve the issue with your 2020 Highlander’s side mirrors not adjusting. Ensure to proceed with caution, especially when working with electrical components. If problems persist after these troubleshooting steps, it may be advisable to consult a professional technician.