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What should I check if my Highlander’s cruise control is not working? - Toyota Highlander
Home/Cars/Toyota/Highlander/Fourth Generation (2020-present)/What should I check if my Highlander’s cruise control is not working?

What should I check if my Highlander’s cruise control is not working?

Toyota Highlander Fourth Generation (2020-present)

Error Codes
1-2 hours
Time
medium
Difficulty
medium
Severity
Navigation
ProblemSymptomsDiagnosisSolution
ProblemSymptomsDiagnosisSolution
4 min read
682 words

Problem Statement

Learn how to diagnose and repair cruise control issues in your Toyota Highlander (2020-present) with step-by-step instructions and required tools.

Affected Component
Cruise Control System
Estimated Time
1-2 hours

Symptoms

  • •Cruise control indicator light does not illuminate when activated
  • •Cruise control won’t engage at all
  • •Cruise control engages but does not maintain speed
  • •Erratic behavior of the cruise control system

Diagnostic Steps

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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, sockets, wrenches)
  • •Vehicle service manual (for reference)
  • •Tire pressure gauge

Additional Information

Affected Component
Cruise Control System
Estimated Time
1-2 hours
Difficulty
medium
Severity
medium
Tools Required
5 items

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Back to Generation

If the cruise control on your Toyota Highlander (Fourth Generation, 2020-present) is not working, follow these detailed diagnostic steps to identify and fix the issue.

Tools Required
  • OBD-II scanner
  • Multimeter
  • Basic hand tools (screwdrivers, sockets, wrenches)
  • Vehicle service manual (for reference)
  • Tire pressure gauge

Step 1: Initial Checks

  1. Check the Vehicle Speed: Ensure that your Highlander is traveling at a speed that is suitable for cruise control engagement (typically above 25 mph).
  2. Inspect the Brake Pedal: Ensure the brake pedal is not stuck or partially engaged, which can disable cruise control.
  3. Check the Cruise Control Switch: Verify that the cruise control switch is functioning properly. It should feel normal when pressed and return to its original position.
  4. Look for Warning Lights: Check if there are any warning lights on the dashboard that could indicate an issue with the vehicle or the cruise control system.

Step 2: Electrical System Check

  1. Use an OBD-II Scanner: Connect the scanner to the OBD-II port and check for any diagnostic trouble codes (DTCs) related to the cruise control system. Take note of any codes found.
  2. Inspect Fuses: Check the fuse related to the cruise control system in the fuse box. Refer to the vehicle's manual for the exact fuse location and specifications. If the fuse is blown, replace it.
  3. Check Wiring and Connectors: Inspect the wiring harness and connectors associated with the cruise control system for signs of damage, corrosion, or loose connections.

Step 3: Brake System Check

  1. Brake Light Switch: The cruise control system is often controlled by the brake light switch. Test the brake light switch for continuity using a multimeter.

    • To Test:
      • Disconnect the switch connector.
      • Set the multimeter to continuity mode.
      • Press the switch and check for a beep or reading. If there's no continuity when pressed, replace the switch.

  2. Brake Fluid Level: Ensure that the brake fluid level is adequate, as low fluid can affect the operation of the cruise control.

Step 4: Throttle Position and Speed Sensor Check

  1. Throttle Position Sensor (TPS): Check the TPS for proper operation. A malfunctioning TPS can prevent cruise control from engaging.

    • To Test:
      • Use a multimeter to measure the voltage output at the TPS while moving the throttle. The voltage should smoothly increase and decrease as you move the throttle.
      • If the readings are erratic or out of specification, consider replacing the TPS.

  2. Vehicle Speed Sensor (VSS): Ensure the VSS is functioning as it provides the necessary speed data to the cruise control system.

    • To Test:
      • Use a multimeter or OBD-II scanner to check the readings from the VSS. If the speed signal is erratic or absent, replace the sensor as needed.
Repair Instructions

Repairing Cruise Control Issues

  1. Replace Faulty Components: If you identified any faulty components (e.g., brake light switch, TPS, or VSS), replace them according to the service manual instructions.
  2. Repair Wiring Issues: If you found damaged wiring, repair or replace the affected sections using appropriate gauge wire and connectors.
  3. Replace Fuse: If a blown fuse was found, replace it and verify that the problem does not persist after replacing the fuse.
Final Steps
  1. Test the System: After making repairs, test the cruise control system at a safe speed to ensure it engages correctly and maintains speed.
  2. Clear Codes: If you used an OBD-II scanner, clear any codes and verify they do not return after testing the cruise control.
  3. Document Repairs: Note any repairs performed for future reference.
Conclusion

Following these diagnostic steps will help you pinpoint the issue with the cruise control system in your Toyota Highlander. If the problem persists after all these checks, consider consulting a professional technician for further diagnosis.