What does the "Check AWD System" message mean in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

627 words

Problem Statement

Learn about the 'Check AWD System' message in a 2020 Toyota Highlander, its symptoms, diagnostic steps, and repair instructions.

Affected Component

All-Wheel Drive (AWD) system

Estimated Time

2-4 hours

Symptoms

•Warning Message: 'Check AWD System' appears on the dashboard.
•Reduced Performance: Vehicle is not engaging AWD properly.
•Unusual Noises: Clunking or grinding noises from the drivetrain.
•Loss of Traction: Vehicle struggles for traction on slippery surfaces.

Diagnostic Steps

1
Visual Inspection: Check for damage, leaks, or loose connections.
2
Scan for Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
3
Check Fluid Levels: Ensure transfer case and differential fluid are correct.
4
Inspect Sensors and Wiring: Examine wheel speed sensors and wiring.
5
Test the AWD System: Perform a functionality test in a controlled environment.

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

•OBD-II Scanner
•Basic hand tools (screwdrivers, wrenches)
•Torque wrench
•Fluid inspection tools (dipstick or funnel)
•Multimeter (for electrical testing)
•Jack and jack stands

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Diagnostic Steps

1
Visual Inspection: Check for damage, leaks, or loose connections.
2
Scan for Diagnostic Trouble Codes (DTCs) using an OBD-II scanner.
3
Check Fluid Levels: Ensure transfer case and differential fluid are correct.
4
Inspect Sensors and Wiring: Examine wheel speed sensors and wiring.
5
Test the AWD System: Perform a functionality test in a controlled environment.

Solution

Understanding the "Check AWD System" Message in a 2020 Toyota Highlander

The "Check AWD System" message on a 2020 Toyota Highlander indicates that there is a potential issue with the All-Wheel Drive (AWD) system. This warning can be triggered by various factors including sensor failures, system malfunctions, or low fluid levels. Here’s how to diagnose and potentially resolve the issue.

Tools Required

OBD-II Scanner
Basic hand tools (screwdrivers, wrenches)
Torque wrench
Fluid inspection tools (dipstick or funnel)
Multimeter (for electrical testing)
Jack and jack stands (if needed for undercarriage inspection)

Repair Instructions

Step 1: Address Diagnostic Codes

If DTCs are present, refer to a repair manual specific to the Highlander for code definitions and troubleshooting steps.
Clear the codes with the OBD-II scanner after addressing the issue and perform a test drive to see if the warning reappears.

Step 2: Fluid Replacement

If fluid levels are low, drain old fluid and replace it with new fluid as specified in the owner’s manual.
Transfer Case Fluid Change:
1. Raise the vehicle and support it with jack stands.
2. Locate the transfer case drain and fill plugs (usually on the side of the case).
3. Remove the drain plug and let the old fluid drain completely.
4. Replace the drain plug and remove the fill plug.
5. Use a funnel to add new fluid until it starts to seep out of the fill hole.
6. Replace the fill plug and lower the vehicle.

Step 3: Repair or Replace Faulty Sensors

If sensors are found to be faulty during inspection, replace them:
1. Disconnect the battery to avoid electrical shorts.
2. Unplug the faulty sensor and remove it from its mounting.
3. Install the new sensor and reconnect the wiring.
4. Reconnect the battery and clear any codes.

Step 4: Test Drive and Verification

After repairs, take the vehicle for a test drive to ensure that the "Check AWD System" message does not reappear and that the AWD system is functioning correctly.

Conclusion

If after performing these diagnostic and repair steps the "Check AWD System" message persists, it is advisable to take the vehicle to a certified Toyota technician for further diagnosis. Complex issues may require specialized equipment and expertise. Regular maintenance and checks can help prevent AWD system issues in the future.