how to troubleshoot the cruise control not working on my Toyota Highlander Third Generation (2014-20...

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

566 words

Problem Statement

Learn how to troubleshoot and fix cruise control issues in a 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine to cool before opening the air intake system.

Symptoms

•Cruise control indicator light not illuminating on the dashboard
•Inability to set or resume cruise control speed
•Cruise control disengaging unexpectedly
•Check engine light illuminated (if related)
•Unresponsive cruise control buttons on the steering wheel

Diagnostic Steps

1
Inspect the cruise control switch on the steering wheel for physical damage or stuck positions.
2
Check the vehicle's OBD-II system for any trouble codes that may indicate related issues.
3
Verify the brake switch operation, as a malfunctioning brake light switch can disable cruise control.
4
Test the vehicle speed sensor to ensure it is providing accurate speed data to the cruise control system.
5
Check for blown fuses related to the cruise control system in the fuse box.
6
Inspect the throttle body and accelerator pedal position sensor for proper operation.

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
•Socket set
•Throttle body cleaner
•Screwdriver set

Parts Required

•Brake light switch (if faulty)
•Vehicle speed sensor (if faulty)
•Fuses (as needed)

Related Faults

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Diagnostic Steps

1
Inspect the cruise control switch on the steering wheel for physical damage or stuck positions.
2
Check the vehicle's OBD-II system for any trouble codes that may indicate related issues.
3
Verify the brake switch operation, as a malfunctioning brake light switch can disable cruise control.
4
Test the vehicle speed sensor to ensure it is providing accurate speed data to the cruise control system.
5
Check for blown fuses related to the cruise control system in the fuse box.
6
Inspect the throttle body and accelerator pedal position sensor for proper operation.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is parked on a level surface and the engine is off.
Disconnect the battery to prevent electrical shorts.

2. Inspect the Cruise Control Switch

Remove the steering wheel cover using a socket set to access the cruise control switch.
Check for any visible damage or debris; clean or replace as necessary.
Reassemble the cover and reconnect the battery.

3. Verify Brake Switch Functionality

Locate the brake light switch, typically found above the brake pedal.
Use a multimeter to check for continuity when the brake pedal is pressed.
If faulty, replace the brake light switch and adjust it to ensure proper operation.

4. Test Vehicle Speed Sensor

Locate the vehicle speed sensor, usually on the transmission.
Disconnect the sensor and use a multimeter to check for proper voltage output while driving.
Replace the speed sensor if readings are outside the manufacturer’s specifications.

5. Check Fuses

Access the fuse box and examine the fuses related to the cruise control (refer to the owner’s manual for the correct fuse locations).
Replace any blown fuses with the appropriate amperage rating.

6. Inspect Throttle Body and Accelerator Position Sensor

Remove the air intake duct to access the throttle body.
Clean the throttle body using throttle body cleaner and a soft cloth.
Test the accelerator position sensor using a multimeter to ensure it operates within the specified range. Replace if necessary.