my Toyota Highlander’s cruise control isn’t working, what should I check?

Toyota Highlander Third Generation (2014-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

593 words

Problem Statement

Learn how to diagnose and fix cruise control issues in your Toyota Highlander. Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

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 handling components.

Symptoms

•Cruise control indicator light not illuminating
•Inability to set or maintain speed
•Cruise control system disengages unexpectedly
•Acceleration or deceleration not responding to cruise control inputs
•Warning lights on the dashboard (e.g., check engine light)

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any relevant trouble codes.
2
Inspect the cruise control switch for physical damage or wear.
3
Check the brake pedal switch to ensure it is functioning properly and not continuously engaged.
4
Examine the throttle position sensor for electrical or mechanical issues.
5
Verify the cruise control module connections for corrosion or loose wiring.
6
Test the vehicle speed sensor to confirm it is providing accurate speed readings.

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
•Socket set
•Multimeter
•Electrical contact cleaner
•Screwdriver set

Parts Required

•Cruise control switch (if defective)
•Brake pedal switch (if defective)
•Throttle position sensor (if faulty)
•Vehicle speed sensor (if necessary)

Related Faults

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Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to identify any relevant trouble codes.
2
Inspect the cruise control switch for physical damage or wear.
3
Check the brake pedal switch to ensure it is functioning properly and not continuously engaged.
4
Examine the throttle position sensor for electrical or mechanical issues.
5
Verify the cruise control module connections for corrosion or loose wiring.
6
Test the vehicle speed sensor to confirm it is providing accurate speed readings.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the negative battery terminal to avoid electrical shorts.
Allow the vehicle to cool down if it has been recently operated.

2. Inspect and Replace Cruise Control Switch

Remove the steering column cover using a socket set.
Unplug the cruise control switch from the wiring harness.
Inspect the switch for signs of wear or damage.
If defective, install a new cruise control switch:
- Plug in the new switch to the wiring harness.
- Reassemble the steering column cover.

3. Check and Replace Brake Pedal Switch

Locate the brake pedal switch above the brake pedal.
Disconnect the wiring harness from the brake pedal switch.
Test the switch for continuity using a multimeter; replace if faulty.
Reconnect the new brake pedal switch and ensure proper adjustment.

4. Inspect Throttle Position Sensor

Locate the throttle position sensor on the throttle body.
Disconnect the electrical connector and check for proper operation using a multimeter.
If faulty, remove the sensor using a socket set, and replace it with a new one.
Reconnect the electrical connector and ensure all connections are secure.

5. Verify Cruise Control Module Connections

Locate the cruise control module, typically found near the engine bay.
Inspect the wiring harness and connectors for corrosion or damage.
Clean any corroded terminals using electrical contact cleaner.
Secure all connections properly.

6. Replace Vehicle Speed Sensor (if necessary)

Locate the vehicle speed sensor, usually near the transmission.
Disconnect the wiring harness and remove the sensor using a socket set.
Install a new vehicle speed sensor and reconnect the wiring harness.