How do I troubleshoot a non-functioning cruise control in my 2020 Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

614 words

Problem Statement

Learn how to troubleshoot and fix non-functioning cruise control in your 2020 Toyota Highlander with step-by-step diagnostic and repair instructions.

Affected Component

Cruise Control System

Estimated Time

2-3 hours

Symptoms

•Cruise Control Light Not Illuminating
•Cruise Control Not Engaging
•Error Messages

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

•Multimeter
•Wiring Diagram
•OBD-II Scanner
•Fuse Puller

Related Faults

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Solution

Troubleshooting Non-Functioning Cruise Control in a 2020 Toyota Highlander

Step 1: Initial Check

Read the Owner’s Manual: Familiarize yourself with the cruise control operation in the Highlander.
Check for Obstructions: Ensure that the brake and throttle pedals are not obstructed and can operate freely.

Step 2: Check the Cruise Control Switch

Tools Required: Multimeter, wiring diagram (available in service manual).
Procedure:
1. Inspect the Switch: Check the cruise control switch for physical damage or disconnection.
2. Test the Switch Functionality:
  - Disconnect the cruise control switch connector.
  - Use a multimeter to check for continuity when pressing the switch buttons (ON, SET, RESUME).
  - If there is no continuity, replace the switch.

Step 3: Inspect the Brake Pedal Switch

Tools Required: Multimeter.
Procedure:
1. Locate the Brake Pedal Switch: Usually mounted near the pedal assembly.
2. Test the Switch:
  - Disconnect the wiring harness from the brake switch.
  - Use a multimeter to check for continuity when the pedal is pressed.
  - If the switch is faulty, replace it.

Step 4: Check the Vehicle's Speed Sensor

Tools Required: OBD-II scanner, multimeter.
Procedure:
1. Scan for DTCs: Use an OBD-II scanner to check for any diagnostic trouble codes related to the speed sensor or cruise control system.
2. Test the Speed Sensor:
  - Locate the vehicle speed sensor (typically on the transmission).
  - Use the multimeter to check for voltage output while driving. The output should vary with vehicle speed.
  - If the sensor is faulty, replace it.

Step 5: Inspect Fuses and Relays

Tools Required: Fuse puller, multimeter.
Procedure:
1. Locate the Fuse Box: Refer to the owner’s manual for the location of the fuse box.
2. Check the Cruise Control Fuse: Remove the fuse for the cruise control system and inspect it for continuity using a multimeter.
3. Inspect Relays: Check for any relevant relays in the fuse box; swap them with similar relays (if available) to test functionality.

Repair Instructions

Step 1: Replace Faulty Components

If any components such as the cruise control switch, brake switch, or speed sensor are found to be faulty, replace them with OEM parts for reliability.

Step 2: Reassemble and Test

Reassemble Any Disconnected Components: Ensure all connectors are properly reattached.
Reconnect the Battery: If you disconnected the battery during troubleshooting, reconnect it.
Perform a Function Test: Start the vehicle and attempt to engage the cruise control.
- Ensure the vehicle is at a safe speed (typically above 25 mph).
- Press the cruise control ON button and set the desired speed.

Step 3: Clear DTCs

If any diagnostic trouble codes were present, use the OBD-II scanner to clear them and see if they return after testing the cruise control.

Additional Considerations

If all tests pass and the cruise control is still non-functional, consider checking the vehicle’s electronic control unit (ECU) for software updates or faults.
In case of persistent issues, a visit to a qualified Toyota dealership for further diagnostics may be advisable, as they have specialized tools and knowledge for the Highlander.

By following these steps, you should be able to effectively troubleshoot and resolve the non-functioning cruise control issue in your 2020 Toyota Highlander.