How can I fix issues with the car’s cruise control not engaging in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

585 words

Problem Statement

Learn how to diagnose and fix cruise control issues on 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 will not engage when the button is pressed.
•The cruise control indicator light may not illuminate on the dashboard.
•The vehicle may not maintain speed when attempting to activate cruise control.
•Other related warning lights may appear, such as the Check Engine light.

Diagnostic Steps

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
•Screwdriver set
•Socket set
•Fuse puller or pliers

Related Faults

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Fixing Cruise Control Issues on a 2020 Toyota Highlander

Step 1: Initial Checks

Check the Owner's Manual: Familiarize yourself with the cruise control system and settings specific to your Highlander.
Inspect the Brake Pedal: Ensure that the brake pedal is not stuck or dragging. If the brake lights are constantly on, the cruise control will not engage.
Verify the Gear Position: Ensure the vehicle is in the correct gear (automatic transmission in Drive). Cruise control typically will not engage while in Park or Neutral.

Step 2: Scan for Diagnostic Trouble Codes (DTCs)

Tools Required: OBD-II scanner
Procedure:
- Connect the OBD-II scanner to the vehicle’s data link connector (usually located under the dashboard).
- Turn the ignition to the "ON" position (do not start the engine).
- Retrieve any trouble codes related to the cruise control system. Note down the codes for further investigation.

Step 3: Inspect the Cruise Control Components

Tools Required: Multimeter, screwdriver set, and socket set
Procedure:
- Cruise Control Switch: Remove the steering column covers to access the cruise control switch. Use a multimeter to test for continuity when the switch is activated.
- Brake Light Switch: Locate the brake light switch (usually mounted near the brake pedal). Test its operation with a multimeter. It should close when the pedal is pressed and open when released.
- Throttle Position Sensor (TPS): Test the TPS for proper voltage and operation as it affects the cruise control system.
- Vehicle Speed Sensor (VSS): Ensure that the VSS is functioning correctly. A malfunctioning VSS can prevent cruise control from engaging.

Step 4: Check the Fuses

Tools Required: Fuse puller or pliers
Procedure:
- Locate the fuse box (usually under the dashboard or in the engine compartment).
- Check the fuse for the cruise control system. Replace any blown fuses with the appropriate amperage.

Repair Instructions

Repairing or Replacing Faulty Components

Cruise Control Switch:
- If the switch tests defective, remove it and replace it with a new unit. Reassemble the steering column covers.
Brake Light Switch:
- If the brake light switch is faulty, disconnect the wiring harness and remove the switch. Install a replacement and reconnect the harness.
Throttle Position Sensor (TPS):
- If the TPS is faulty, remove the electrical connector and detach it from the throttle body. Replace it with a new sensor.
Vehicle Speed Sensor (VSS):
- If the VSS is defective, locate it (usually mounted on the transmission). Remove the wiring connector, unscrew the sensor, and replace it with a new one.

Final Steps

Recheck All Connections: Ensure all connectors are securely attached and there are no loose wires.
Clear DTCs: Use the OBD-II scanner to clear any trouble codes after making repairs.
Test Drive: Take the vehicle for a test drive to ensure the cruise control engages properly and maintains speed.

Conclusion

If cruise control still does not engage after checking all components, it may require professional diagnosis. There could be more complex issues within the vehicle's electronic control unit (ECU) or wiring that require advanced tools and knowledge.