What should I do if the tire pressure monitoring system on my 2021 Toyota Highlander is malfunctioni...

Toyota Highlander Fourth Generation (2020-present)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

4 min read

624 words

Problem Statement

Learn how to diagnose and repair the Tire Pressure Monitoring System (TPMS) on your 2021 Toyota Highlander with detailed steps and required tools.

Affected Component

Tire Pressure Monitoring System (TPMS)

Estimated Time

1-2 hours

Symptoms

•Warning Light: The TPMS warning light on the dashboard is illuminated.
•Inaccurate Pressure Readings: The displayed tire pressures may not match the actual tire pressures.
•Flashing Light: The TPMS light may flash when you start the vehicle and then remain on.
•No Pressure Readings: The system fails to display any tire pressure readings.

Diagnostic Steps

1
Visual Inspection
2
Check Tire Pressure
3
Reset the TPMS
4
Check for Fault Codes

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

•Tire pressure gauge
•OBD-II scanner
•Tire changing tools
•TPMS sensor tool
•Socket set
•Torque wrench
•Multimeter
•Wire strippers
•Soldering iron or crimp connectors

Related Faults

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Symptoms

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

•Inaccurate Pressure Readings: The displayed tire pressures may not match the actual tire pressures.

•Flashing Light: The TPMS light may flash when you start the vehicle and then remain on.

•No Pressure Readings: The system fails to display any tire pressure readings.

Solution

Certainly! If the Tire Pressure Monitoring System (TPMS) on your 2021 Toyota Highlander is malfunctioning, follow these detailed steps to diagnose and resolve the issue.

Step 1: Visual Inspection

Tools Required: None
Inspect all tires (including the spare tire, if applicable) for obvious signs of damage, punctures, and proper inflation.
Ensure that the valve stems are intact and not damaged.

Step 2: Check Tire Pressure

Tools Required: Tire pressure gauge
Use a tire pressure gauge to measure the pressure in all tires. Compare these readings with the recommended tire pressures found on the driver’s side door jamb.
Inflate or deflate tires as necessary to match the recommended pressure.

Step 3: Reset the TPMS

Tools Required: None
Start the vehicle and check if the TPMS warning light is still illuminated.
If the light is still on, proceed to reset the TPMS:
1. With the vehicle in "On" (not running), press and hold the TPMS reset button located beneath the steering column until the TPMS warning light blinks three times before turning off.
2. Drive the vehicle at speeds above 25 mph for about 10-15 minutes to allow the system to recalibrate.

Step 4: Check for Fault Codes

Tools Required: OBD-II scanner
Connect an OBD-II scanner to the vehicle’s diagnostic port (usually located beneath the dashboard).
Check for any TPMS-related fault codes. Codes related to the TPMS may indicate issues with specific sensor(s) or wiring.

Repair Instructions

If Fault Codes Indicate Sensor Issues:

Tools Required: Tire changing tools, TPMS sensor tool, socket set, torque wrench.
Remove the Tire:
- Loosen the lug nuts with a socket wrench.
- Use a tire jack to lift the vehicle and remove the wheel from the hub.
Replace the TPMS Sensor:
- Locate the TPMS sensor mounted inside the tire on the valve stem.
- Use a TPMS sensor tool to remove the old sensor and install the new one.
- Ensure that the sensor is properly seated and secured.
Reinstall the Tire:
- Reattach the wheel to the hub, tightening the lug nuts in a star pattern to the manufacturer’s specified torque.
- Lower the vehicle and recheck the pressure in the tire.
Reprogram the TPMS:
- If necessary, use the TPMS tool to reprogram the new sensor to the vehicle’s TPMS system, following the tool’s instructions.

If Fault Codes Indicate Wiring Issues:

Tools Required: Multimeter, wire strippers, soldering iron or crimp connectors.
Inspect Wiring:
- Visually check for any damaged wiring or loose connections in the TPMS wiring harness.
Test Continuity:
- Use a multimeter to test continuity in the wiring from the TPMS module to the sensors.
Repair Wiring:
- If any breaks are found, repair the wiring using solder or crimp connectors to ensure a solid connection.

Final Steps

Recheck Pressure and Light: After replacement or repair, check all tire pressures and ensure the TPMS light has turned off.
Road Test: Take the vehicle for a short drive to ensure the TPMS system recalibrates and operates correctly.

Conclusion

Following these steps will help you diagnose and repair the malfunctioning TPMS on your 2021 Toyota Highlander. If issues persist after performing these steps, consider visiting a certified Toyota service center for further diagnostics.