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Are there any known electrical faults affecting the 2020 Toyota Highlander? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/Are there any known electrical faults affecting the 2020 Toyota Highlander?

Are there any known electrical faults affecting the 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
3 min read
578 words

Problem Statement

Explore common electrical faults affecting the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component
Electrical System

Symptoms

  • •Inconsistent Power to Accessories
  • •Battery Drain
  • •Warning Lights
  • •Malfunctioning Keyless Entry

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

  • •Flashlight
  • •Multimeter
  • •Fuse puller or needle-nose pliers
  • •OBD-II scanner
  • •Key fob tester (optional)

Additional Information

Affected Component
Electrical System
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation
Known Electrical Faults in the 2020 Toyota Highlander

The 2020 Toyota Highlander, part of the fourth generation (XU70), has been reported to have a few electrical faults. Below are some common symptoms, diagnostic steps, tools required, and repair instructions for these issues.

Common Symptoms

  1. Inconsistent Power to Accessories:

    • Power windows may work intermittently.
    • Radio and infotainment system may reset or turn off unexpectedly.

  2. Battery Drain:

    • Vehicle battery discharges quickly, particularly after sitting for a few days.

  3. Warning Lights:

    • Dashboard warning lights, such as ABS, Check Engine, or Battery light, may illuminate without an apparent reason.

  4. Malfunctioning Keyless Entry:

    • Key fob may not unlock or lock doors reliably.

Step 1: Visual Inspection

  • Tools Required: Flashlight, Multimeter
  • Check the battery terminals for corrosion or loose connections.
  • Inspect the wiring harnesses for any signs of wear, fraying, or damaged insulation.

Step 2: Battery Health Check

  • Tools Required: Multimeter
  • Test the battery voltage with the vehicle off. A healthy battery should read between 12.4 to 12.7 volts.
  • Start the engine and check the voltage again. It should read between 13.7 to 14.7 volts, indicating proper alternator function.

Step 3: Check Fuses

  • Tools Required: Fuse puller or needle-nose pliers
  • Inspect the fuse box for any blown fuses related to the affected systems (e.g., power windows, infotainment).

Step 4: Scan for Diagnostic Trouble Codes (DTC)

  • Tools Required: OBD-II scanner
  • Connect the scanner to the OBD-II port and check for any stored trouble codes that may provide insight into electrical issues.

Step 5: Test Keyless Entry System

  • Tools Required: Key fob tester (optional)
  • Use the key fob to test the locking and unlocking functions. If it fails, check the battery inside the fob and replace if necessary.
Repair Instructions

Repair 1: Battery Terminal Corrosion

  1. Disconnect the negative (-) terminal first, followed by the positive (+) terminal.
  2. Clean the terminals with a mixture of baking soda and water to neutralize corrosion.
  3. Reconnect the positive (+) terminal first, followed by the negative (-) terminal.

Repair 2: Replace Blown Fuses

  1. Identify the blown fuse using the vehicle’s manual for the fuse box location and specifications.
  2. Remove the blown fuse using a fuse puller or pliers.
  3. Insert a new fuse of the same amperage.
  4. Test the affected system to ensure functionality.

Repair 3: Battery Replacement

  1. Disconnect the negative terminal followed by the positive terminal.
  2. Remove any brackets or hold-downs securing the battery.
  3. Remove the old battery and place the new one in the battery tray.
  4. Reconnect the positive terminal first, followed by the negative terminal.
  5. Test the new battery with a multimeter to ensure proper voltage.

Repair 4: Key Fob Battery Replacement

  1. Open the key fob using a small flat-head screwdriver.
  2. Carefully remove the old battery and insert a new CR2032 battery, ensuring proper polarity.
  3. Snap the fob back together and test the functions.
Conclusion

If the above steps do not resolve the issue, it may be necessary to consult with a qualified Toyota technician or dealership, as there might be more complex issues at play, such as BCM (Body Control Module) failures or wiring issues within the vehicle’s electrical system. Always refer to the vehicle’s service manual for specific guidance related to the Highlander’s electrical system.