How do I troubleshoot the cruise control not engaging in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

medium

Difficulty

medium

Severity

4 min read

638 words

Problem Statement

Learn how to troubleshoot and fix cruise control issues in a 2020 Toyota Highlander with our step-by-step guide.

Affected Component

Cruise Control System

Symptoms

•Cruise control system does not activate when the button is pressed.
•Cruise control indicator light on the dashboard does not illuminate.
•Vehicle speed does not maintain when attempting to engage cruise control.
•System may engage sometimes but not consistently.

Diagnostic Steps

1
Check the Basics: Ensure the vehicle is traveling at a speed above the minimum threshold (usually around 25 mph) for cruise control to engage.
2
Check Gear Position: Make sure the vehicle is in the correct gear (not in Park or Neutral).
3
Verify that the cruise control button is functioning properly.
4
Visual Inspection: Check for any physical damage to the cruise control switch on the steering wheel.
5
Look for blown fuses related to the cruise control system in the fuse box.
6
Use an OBD-II scanner to check for any fault codes related to the cruise control system.
7
Test the brake switch with a multimeter to ensure it is functioning correctly.
8
Check the brake fluid reservoir level.

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
•Basic hand tools (screwdrivers, pliers)
•Replacement fuses (if needed)
•Replacement brake switch (if needed)

Related Faults

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Diagnostic Steps

1
Check the Basics: Ensure the vehicle is traveling at a speed above the minimum threshold (usually around 25 mph) for cruise control to engage.
2
Check Gear Position: Make sure the vehicle is in the correct gear (not in Park or Neutral).
3
Verify that the cruise control button is functioning properly.
4
Visual Inspection: Check for any physical damage to the cruise control switch on the steering wheel.
5
Look for blown fuses related to the cruise control system in the fuse box.
6
Use an OBD-II scanner to check for any fault codes related to the cruise control system.
7
Test the brake switch with a multimeter to ensure it is functioning correctly.
8
Check the brake fluid reservoir level.

Solution

Troubleshooting Cruise Control Not Engaging in a 2020 Toyota Highlander

Step 1: Check the Basics

Vehicle Speed: Ensure the vehicle is traveling at a speed above the minimum threshold (usually around 25 mph) for cruise control to engage.
Gear Position: Make sure the vehicle is in the correct gear (not in Park or Neutral).
Cruise Control Switch: Verify that the cruise control button is functioning properly.

Step 2: Inspect the Cruise Control System

Visual Inspection:
- Check for any physical damage to the cruise control switch on the steering wheel.
- Look for blown fuses related to the cruise control system in the fuse box (refer to the owner’s manual for specific fuse location).
Diagnostic Tool:
- Use an OBD-II scanner to check for any fault codes related to the cruise control system. Connect the scanner to the OBD-II port (usually located under the dashboard near the driver's seat).
- Note any codes, especially those related to the Vehicle Speed Sensor (VSS), brake system, or throttle control.

Step 3: Brake System Check

Brake Pedal Switch: The cruise control system is disabled if the brake pedal is depressed.
- Test the brake switch with a multimeter to ensure it is functioning correctly. The switch should close (show continuity) when the pedal is not pressed and open (no continuity) when pressed.
- If defective, replace the brake switch.
Brake Fluid Level: Check the brake fluid reservoir level. Low brake fluid can trigger the cruise control to deactivate.

Tools Required:

OBD-II Scanner
Multimeter
Basic hand tools (screwdrivers, pliers)
Replacement fuses (if needed)
Replacement brake switch (if needed)

Repair Instructions:

If Diagnostic Codes are Present:

Address Specific Fault Codes:
- For codes related to the VSS, inspect the sensor and wiring for damage or disconnections. Replace the sensor if necessary.
- For codes indicating a problem with the throttle body or electronic throttle control, inspect the throttle position sensor and connections, and clean the throttle body if dirty.

If the Brake Switch is Defective:

Access the Brake Switch:
- Locate the brake switch above the brake pedal. It is typically secured with a couple of screws.
- Disconnect the wiring harness from the switch.
Replace the Brake Switch:
- Remove the old switch and install the new one in reverse order.
- Reconnect the wiring harness and ensure it clicks into place.

If Fuses are Blown:

Replace the Fuse:
- Locate the fuse box (usually under the dashboard or in the engine compartment).
- Identify the cruise control fuse using the diagram on the fuse box cover.
- Remove the blown fuse using a fuse puller or pliers and replace it with a new fuse of the same amperage.

Final Steps:

Re-Test the Cruise Control: After performing repairs, test the cruise control system again by driving at a speed above 25 mph and pressing the cruise control button.
Clear Diagnostic Codes: If applicable, use the OBD-II scanner to clear any fault codes, then re-check the system after repairs.
Test Drive: Conduct a test drive to ensure the cruise control engages and disengages properly, and monitor for any warning lights on the dashboard.

Conclusion:

If the cruise control still does not engage after following these troubleshooting steps and repairs, further investigation into the vehicle's electronic control unit (ECU) or wiring harness may be necessary, and consulting with a professional technician or Toyota dealer is recommended.