Is it common for the 2020 Highlander to have issues with the adaptive cruise control system?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

630 words

Problem Statement

Explore common issues with the adaptive cruise control system in the 2020 Toyota Highlander, including symptoms, diagnostic steps, and repair instructions.

Affected Component

Adaptive Cruise Control System

Estimated Time

2-4 hours

Symptoms

•Inconsistent Speed Maintenance
•Failure to Engage
•Unresponsive Controls
•Warning Lights
•Erratic Behavior

Diagnostic Steps

1
Check for Error Codes
2
Inspect System Components
3
Test the Cruise Control Function
4
Check Steering Wheel Controls

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
•Multimeter
•Torx screwdriver set
•Flashlight
•Ratchet set
•Torque wrench
•Toyota Techstream or a compatible scan tool

Related Faults

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Solution

Common Issues with Adaptive Cruise Control in the 2020 Toyota Highlander

Overview

The adaptive cruise control (ACC) system in the 2020 Toyota Highlander is designed to monitor the speed of the vehicle and maintain a safe following distance from the vehicle ahead. While generally reliable, some users have reported issues that can range from minor inconveniences to more serious malfunctions.

Repair Instructions

Cleaning the Radar Sensor:
- Step: If the radar sensor is dirty, clean it using a microfiber cloth and a gentle glass cleaner. Ensure no residue is left.
- Step: Re-test the ACC after cleaning.
Repairing Wiring Connections:
- Step: If there are damaged wires, repair them by splicing in new wire of the same gauge and soldering the connections. Use heat shrink tubing to insulate the repaired areas.
- Step: Reconnect all connectors securely and ensure no wires are pinched or exposed.
Replacing the Radar Sensor:
- Tools Required: Ratchet set, torque wrench
- Step: If the radar sensor is determined to be faulty, remove it by unscrewing the mounting bolts.
- Step: Disconnect the wiring harness from the old sensor and connect it to the new sensor.
- Step: Install the new sensor, tightening the bolts to the manufacturer’s specified torque.
- Step: Clear any error codes with the OBD-II scanner and test the system again.
Reprogramming the System (if necessary):
- Tools Required: Toyota Techstream or a compatible scan tool
- Step: If components have been replaced, use the scan tool to reprogram the ACC system. Follow the prompts to reset and calibrate the system.

Final Steps

Test Drive: After repairs, take the vehicle for a test drive to ensure the ACC functions correctly under varied driving conditions.
Monitor for Recurrences: Keep an eye on the system for any signs of reoccurring issues. If problems persist, consider consulting with a professional technician or a Toyota dealership for further diagnostics.

Conclusion

While issues with the adaptive cruise control system in the 2020 Highlander can occur, following these diagnostic and repair steps can help resolve many common problems. Always ensure that safety procedures are followed during repairs, and consult the vehicle’s service manual for specific torque specifications and part numbers.