How do I address an issue with the electronic parking brake in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

4 min read

636 words

Problem Statement

Learn how to diagnose and repair electronic parking brake issues in a 2020 Toyota Highlander with step-by-step instructions.

Affected Component

electronic parking brake

Estimated Time

2-4 hours

Symptoms

•Warning Light: The parking brake warning light on the dashboard is illuminated.
•Inability to Engage/Disengage: The electronic parking brake (EPB) does not engage or disengage when activated via the switch.
•Strange Noises: Unusual sounds (grinding, clicking) when attempting to operate the parking brake.
•Error Messages: Messages displayed on the dashboard indicating a parking brake malfunction.

Diagnostic Steps

1
Initial Inspection: Verify the symptoms reported by the driver. Check for any visible damage or obstructions around the rear brake components.
2
Scan for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to check for any stored DTCs related to the electronic parking brake system.
3
Check the EPB Switch: Inspect the electronic parking brake switch for physical damage or moisture intrusion.
4
Inspect the Wiring and Connectors: Visually inspect wiring harnesses and connectors associated with the EPB system for signs of wear, corrosion, or disconnection.
5
Examine the EPB Actuator: Inspect the EPB actuator motor for signs of damage or wear.
6
Check Brake Components: Inspect the rear brake calipers and pads to ensure they are in good condition and not stuck.

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
•Torque wrench
•Basic hand tools (screwdrivers, sockets, ratchets)
•Brake cleaner
•Safety glasses and gloves
•Vehicle lift or jack stands

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Warning Light: The parking brake warning light on the dashboard is illuminated.

•Inability to Engage/Disengage: The electronic parking brake (EPB) does not engage or disengage when activated via the switch.

•Strange Noises: Unusual sounds (grinding, clicking) when attempting to operate the parking brake.

•Error Messages: Messages displayed on the dashboard indicating a parking brake malfunction.

Diagnostic Steps

1
Initial Inspection: Verify the symptoms reported by the driver. Check for any visible damage or obstructions around the rear brake components.
2
Scan for Diagnostic Trouble Codes (DTCs): Use an OBD-II scanner to check for any stored DTCs related to the electronic parking brake system.
3
Check the EPB Switch: Inspect the electronic parking brake switch for physical damage or moisture intrusion.
4
Inspect the Wiring and Connectors: Visually inspect wiring harnesses and connectors associated with the EPB system for signs of wear, corrosion, or disconnection.
5
Examine the EPB Actuator: Inspect the EPB actuator motor for signs of damage or wear.
6
Check Brake Components: Inspect the rear brake calipers and pads to ensure they are in good condition and not stuck.

Solution

Addressing Issues with the Electronic Parking Brake in a 2020 Toyota Highlander

Tools Required:

OBD-II scanner
Multimeter
Torque wrench
Basic hand tools (screwdrivers, sockets, ratchets)
Brake cleaner
Safety glasses and gloves
Vehicle lift or jack stands

Repair Instructions:

1. Clearing DTCs:

If any DTCs were found, clear them using the OBD-II scanner and retest the system to see if the issue reoccurs.

2. Replacing the EPB Switch:

If the switch is faulty, perform the following:
1. Disconnect the negative battery terminal.
2. Remove the trim panel surrounding the EPB switch.
3. Unplug the connector from the switch and remove the switch from the console.
4. Install the new switch, reconnect the wiring, and reassemble the trim panel.
5. Reconnect the battery.

3. Repairing/Replacing Wiring:

If wiring issues are found:
1. Repair any damaged wires by soldering or replacing sections as necessary.
2. Ensure all connectors are secure and free from corrosion.

4. Replacing the EPB Actuator:

If the actuator is faulty:
1. Raise the vehicle and remove the rear wheels.
2. Locate the EPB actuator on the rear calipers.
3. Disconnect the electrical connector and remove the mounting bolts.
4. Install the new actuator and reconnect the wiring.
5. Reinstall the wheels and lower the vehicle.

5. Checking Brake Components:

If brake components are found to be worn:
1. Remove the caliper and inspect the brake pads and rotors.
2. Replace worn pads or rotors as necessary.
3. Ensure proper lubrication of the caliper guide pins.

Final Steps:

Recheck System Functionality:
- After repairs, test the electronic parking brake operation to ensure it engages and disengages properly.
Re-scan for DTCs:
- Use the OBD-II scanner again to ensure no new codes have appeared.
Road Test:
- Conduct a road test to verify that the parking brake is functioning under driving conditions.

Conclusion:

By following the structured diagnostic and repair steps outlined, you can effectively address issues with the electronic parking brake system on a 2020 Toyota Highlander. Always remember to follow safety procedures and consider consulting the vehicle's service manual for specific torque specifications and detailed diagrams.