How do I fix the audio system that cuts out in a 2020 Toyota Highlander?

Toyota Highlander Fourth Generation (2020-present)

Error Codes

2-3 hours

Time

medium

Difficulty

medium

Severity

4 min read

670 words

Problem Statement

Learn how to diagnose and fix audio system problems in a 2020 Toyota Highlander with step-by-step instructions.

Affected Component

audio system

Estimated Time

2-3 hours

Symptoms

•Audio cuts out intermittently or completely.
•Volume controls may become unresponsive.
•Error messages may appear on the infotainment screen.
•Certain audio sources (Bluetooth, radio, etc.) may be more affected than others.
•No sound when the vehicle is turned on, but may work intermittently when driving.

Diagnostic Steps

1
Check the Vehicle’s Battery
2
Inspect Fuses
3
Change Sources
4
Reconnect Bluetooth
5
Check for any available software updates
6
Check the wiring harnesses behind the head unit and speakers

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
•Fuse puller or pliers
•Screwdriver set (Phillips and flathead)
•Torx driver set
•Trim removal tool (optional)
•OBD-II scanner (optional, for software issues)

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Back to Generation

Fixing the Audio System that Cuts Out in a 2020 Toyota Highlander

Step 1: Initial Inspection

Check the Vehicle’s Battery: A weak battery can cause electrical issues, including audio system failures.
Inspect Fuses: Check the audio system fuse in the fuse box for any signs of damage or failure.

Step 2: Test Audio Sources

Change Sources: Switch between different audio sources (radio, Bluetooth, USB, etc.) to determine if the issue is isolated to one source or affects all.
Reconnect Bluetooth: If the issue is with Bluetooth, delete the connection in both the vehicle’s system and the mobile device, then reconnect.

Step 3: Software Check

Software Updates: Check for any available software updates for the vehicle's infotainment system. This can be done through the settings menu or by visiting a dealership.

Step 4: Inspect Wiring and Connections

Visual Inspection: Check the wiring harnesses behind the head unit and speakers for any loose or damaged connections.
Multimeter Test: Use a multimeter to test the power supply to the audio components. Check for continuity in the wiring.

Tools Required

Multimeter
Fuse puller or pliers
Screwdriver set (Phillips and flathead)
Torx driver set
Trim removal tool (optional)
OBD-II scanner (optional, for software issues)

Repair Instructions

Step 1: Check and Replace Fuses

Locate the Fuse Box: Open the driver’s side door and look for the fuse access panel.
Remove the Fuse Panel Cover: Use your hands or a screwdriver to remove the cover.
Identify the Audio Fuse: Refer to the fuse diagram located inside the cover or in the owner’s manual.
Inspect the Fuse: Remove the audio system fuse using a fuse puller. Check if the filament is broken.
Replace if Necessary: If the fuse is blown, replace it with one of the same amperage.

Step 2: Reset the Audio System

Power Off the Vehicle: Turn the ignition off and remove the key.
Disconnect the Battery: Using a wrench, disconnect the negative battery terminal to reset the system.
Wait 5-10 Minutes: Allow the system to reset.
Reconnect the Battery: Reattach the negative terminal and tighten it securely.

Step 3: Inspect Wiring and Connections

Remove the Head Unit: Use the trim removal tool and screwdrivers to carefully remove the trim around the head unit.
Access Wiring: Unscrew and carefully pull out the head unit to expose the wiring harness.
Check Connections: Inspect all connections for tightness and damage. Re-seat any loose connectors.
Test for Power: Use a multimeter to check the voltage at the head unit. Ensure it is receiving power.

Step 4: Update Software

Visit the Settings Menu: Turn on the vehicle and navigate to the settings in the infotainment system.
Check for Updates: Look for a “System Update” option. Follow the prompts to complete any available updates.
OBD-II Scan: If problems persist, use an OBD-II scanner to check for any diagnostic trouble codes (DTCs) related to the audio system.

Step 5: Reassemble and Test

Reinstall the Head Unit: Carefully push the head unit back into place and secure it with screws.
Reattach Trim: Snap or screw the trim back into place.
Test the Audio System: Start the vehicle and test all audio sources to ensure the problem is resolved.

Conclusion

If the audio system continues to cut out after completing these steps, it may require professional diagnosis. Consider reaching out to a certified Toyota technician for further inspection, especially if the issue is related to the amplifier or internal components of the head unit.