How do I fix a malfunctioning cruise control system in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

647 words

Problem Statement

Learn how to diagnose and repair a malfunctioning cruise control system in your 2020 Toyota Highlander with step-by-step instructions and required tools.

Affected Component

Cruise Control System

Estimated Time

2-4 hours

Symptoms

•Cruise control does not engage when activated.
•Cruise control activates but does not maintain set speed.
•Cruise control disengages unexpectedly.
•The cruise control indicator light on the dashboard is not illuminated.
•Error messages or warning lights displayed on the dashboard.

Diagnostic Steps

1
Visual Inspection: Check for any visible damage to the cruise control switch on the steering wheel and inspect the wiring harness for any frayed wires or loose connections.
2
Check Fuse: Locate the fuse box, identify the cruise control fuse, remove it and inspect it.
3
Scan for Error Codes: Use an OBD-II scanner to check for any trouble codes stored in the vehicle's ECU.
4
Test the Cruise Control Switch: Disconnect the battery, remove the steering wheel airbag, and test the cruise control switch for continuity.
5
Inspect the Brake Pedal Switch: Check the brake pedal switch for proper operation and alignment.
6
Check Vehicle Speed Sensor (VSS): Test the VSS for proper voltage output while the vehicle is in motion.

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
•Screwdrivers (Phillips and flathead)
•Torque wrench (if needed for reassembly)
•Replacement fuses (if necessary)
•Replacement parts (if any of the components are faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Visual Inspection: Check for any visible damage to the cruise control switch on the steering wheel and inspect the wiring harness for any frayed wires or loose connections.
2
Check Fuse: Locate the fuse box, identify the cruise control fuse, remove it and inspect it.
3
Scan for Error Codes: Use an OBD-II scanner to check for any trouble codes stored in the vehicle's ECU.
4
Test the Cruise Control Switch: Disconnect the battery, remove the steering wheel airbag, and test the cruise control switch for continuity.
5
Inspect the Brake Pedal Switch: Check the brake pedal switch for proper operation and alignment.
6
Check Vehicle Speed Sensor (VSS): Test the VSS for proper voltage output while the vehicle is in motion.

Solution

Fixing a Malfunctioning Cruise Control System in a 2020 Toyota Highlander (Fourth Generation - XU70)

Tools Required:

OBD-II scanner
Multimeter
Screwdrivers (Phillips and flathead)
Torque wrench (if needed for reassembly)
Replacement fuses (if necessary)
Replacement parts (if any of the components are faulty)

Repair Instructions:

Replace the Cruise Control Fuse (if blown):
- Open the fuse box and locate the cruise control fuse.
- Remove the blown fuse and replace it with a new one of the same amperage.
Replace the Cruise Control Switch (if faulty):
- Disconnect the battery.
- Remove the steering wheel airbag using the appropriate tools and safety precautions.
- Unscrew and remove the cruise control switch from the steering wheel assembly.
- Install the new cruise control switch and reassemble the steering wheel airbag.
Replace the Brake Pedal Switch (if faulty):
- Locate the brake pedal switch (usually mounted above the brake pedal).
- Disconnect the wiring harness and remove the switch.
- Install the new brake pedal switch and reconnect the wiring harness.
Replace the Vehicle Speed Sensor (if faulty):
- Locate the VSS (typically found on the transmission).
- Disconnect the wiring harness and remove the sensor using the appropriate socket.
- Install the new VSS and reconnect the wiring harness.
Clear Error Codes:
- Reconnect the negative battery terminal.
- Use the OBD-II scanner to clear any error codes that may have been logged.
Test the System:
- Start the vehicle and take it for a test drive.
- Engage the cruise control to ensure it activates, maintains speed, and disengages properly when the brake pedal is pressed.

Conclusion:

If the cruise control system is still malfunctioning after performing these diagnostics and repairs, it may be necessary to consult a professional technician or the nearest Toyota dealership for further diagnosis, as there may be deeper issues within the vehicle's ECU or wiring harness.