How do I fix the blind spot monitoring not functioning in my 2022 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

606 words

Problem Statement

Learn how to diagnose and fix the blind spot monitoring system in your 2022 Toyota Highlander with step-by-step instructions.

Affected Component

Blind Spot Monitoring System

Estimated Time

2-3 hours

Symptoms

•The blind spot monitoring system (BSM) indicator lights are not illuminating.
•No alerts when vehicles are in the blind spot.
•The BSM system warning light on the dashboard may be illuminated.

Diagnostic Steps

1
Check the exterior mirrors for dirt, obstructions, or damage.
2
Inspect the wiring harness connected to the sensors for any visible damage or disconnection.
3
Ensure that the blind spot monitoring feature is enabled in the vehicle settings.
4
Use an OBD-II scanner to check for any trouble codes related to the BSM system.

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
•Multi-meter
•Basic hand tools (screwdrivers, sockets)
•Torque wrench
•Vehicle owner’s manual

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Diagnostic Steps

1
Check the exterior mirrors for dirt, obstructions, or damage.
2
Inspect the wiring harness connected to the sensors for any visible damage or disconnection.
3
Ensure that the blind spot monitoring feature is enabled in the vehicle settings.
4
Use an OBD-II scanner to check for any trouble codes related to the BSM system.

Solution

Fixing Blind Spot Monitoring Not Functioning in 2022 Toyota Highlander

Symptoms:

The blind spot monitoring system (BSM) indicator lights are not illuminating.
No alerts when vehicles are in the blind spot.
The BSM system warning light on the dashboard may be illuminated.

Diagnostic Steps:

Visual Inspection:
- Check the exterior mirrors for dirt, obstructions, or damage. The sensors are typically located near the base of the side mirrors.
- Inspect the wiring harness connected to the sensors for any visible damage or disconnection.
Check Vehicle Settings:
- Using the vehicle’s infotainment system, navigate to the vehicle settings and ensure that the blind spot monitoring feature is enabled.
- Refer to the owner’s manual for specific steps to access these settings.
Scan for Diagnostic Trouble Codes (DTCs):
- Use an OBD-II scanner to check for any trouble codes related to the BSM system.
- Look for codes that might indicate sensor failures or communication issues.

Tools Required:

OBD-II Scanner
Multi-meter
Basic hand tools (screwdrivers, sockets)
Torque wrench
Vehicle owner’s manual

Repair Instructions:

Step 1: Perform a Visual Inspection

Action:
1. Inspect both side mirrors for any obstructions or dirt.
2. Check that the sensors are clean and free of any debris or ice.
3. Look for signs of physical damage to the sensors or mirror assembly.

Step 2: Verify System Settings

Action:
1. Start the vehicle and access the settings via the infotainment system.
2. Navigate to “Settings” → “Vehicle” → “Blind Spot Monitor.”
3. Ensure that the blind spot monitor is turned ON.

Step 3: Scan for DTCs

Action:
1. Connect the OBD-II scanner to the vehicle’s OBD-II port (usually located under the dashboard).
2. Turn the ignition to the ON position (do not start the engine).
3. Run a diagnostic scan and check for any codes related to the BSM system.
4. Note down any trouble codes for further analysis.

Step 4: Inspect and Test the Sensors

Action:
1. Remove the side mirror housing to access the blind spot sensors. This may involve removing screws or clips.
2. Disconnect the wiring harness from the sensors.
3. Using a multimeter, test the continuity of the sensor wiring for shorts or breaks.
4. If the wiring is intact, test the sensors with the multimeter for proper voltage (refer to the service manual for specific voltage values).

Step 5: Replace Faulty Components

Action:
1. If any sensors are found to be faulty during testing, they will need to be replaced. Follow these steps:
  - Disconnect the wiring harness and remove the faulty sensor from the mirror assembly.
  - Install the new sensor in the reverse order of removal.
  - Reconnect the wiring harness securely.

Step 6: Reassemble and Test

Action:
1. Reattach the side mirror housing, ensuring all clips and screws are secured.
2. Start the vehicle and check if the BSM indicator lights illuminate correctly upon ignition.
3. Test the blind spot monitor by having another vehicle pass through the blind spot area to see if the system activates.

Step 7: Clear DTCs

Action:
1. If you had DTCs, clear them using the OBD-II scanner and perform a final test drive to ensure the system is functioning correctly.

Final Notes:

If the problem persists after completing all the above steps, it may require professional diagnosis, as the issue could stem from deeper electronic or software malfunctions that require specialized equipment.
Always consult the vehicle's service manual for specifications, torque settings, and detailed procedures related to your specific model.