why does my Toyota Highlander Third Generation (2014-2019) dash display go black intermittently?

Toyota Highlander Third Generation (2014-2019)

Error Codes

1-3 hours

Time

medium

Difficulty

medium

Severity

3 min read

572 words

Problem Statement

Learn how to diagnose and fix intermittent blackouts of the dash display in a 2014-2019 Toyota Highlander. Step-by-step guide with diagnostic procedures.

Affected Component

Electrical

Estimated Time

1-3 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems to avoid shock or short circuits.

Symptoms

•Dash display goes completely black at random intervals
•Instrument panel lights may flicker before going black
•Loss of visibility for speedometer and warning lights
•Possible accompanying issues with infotainment or navigation system
•Check engine or other warning lights may not be visible when display is black

Diagnostic Steps

1
Inspect the vehicle's battery and charging system for proper voltage and connections.
2
Scan the vehicle's onboard diagnostics using an OBD-II scanner to check for any error codes related to the instrument cluster.
3
Check for loose or damaged wiring connections behind the dash display.
4
Examine the vehicle’s fuses related to the dashboard and instrument cluster for any blown fuses.
5
Perform a software update on the vehicle's ECU if available, as outdated software may cause display issues.
6
Test the instrument cluster with a multimeter to check for proper voltage and ground signals.

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
•Socket set
•Phillips screwdriver

Parts Required

•Replacement fuses (if applicable)
•Wiring harness (if damaged)

Related Faults

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Symptoms

•Dash display goes completely black at random intervals

•Instrument panel lights may flicker before going black

•Loss of visibility for speedometer and warning lights

•Possible accompanying issues with infotainment or navigation system

•Check engine or other warning lights may not be visible when display is black

Diagnostic Steps

1
Inspect the vehicle's battery and charging system for proper voltage and connections.
2
Scan the vehicle's onboard diagnostics using an OBD-II scanner to check for any error codes related to the instrument cluster.
3
Check for loose or damaged wiring connections behind the dash display.
4
Examine the vehicle’s fuses related to the dashboard and instrument cluster for any blown fuses.
5
Perform a software update on the vehicle's ECU if available, as outdated software may cause display issues.
6
Test the instrument cluster with a multimeter to check for proper voltage and ground signals.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, and a Phillips screwdriver.
Disconnect the negative battery terminal to prevent electrical shorts.

2. Inspect Battery and Charging System

Use a multimeter to measure battery voltage; it should be around 12.6 volts when the vehicle is off and 13.7-14.7 volts when running.
Check battery terminals for corrosion or loose connections and clean or tighten as necessary.

3. Check Wiring and Connections

Remove the dash panel using a Phillips screwdriver.
Inspect the wiring harness connected to the instrument cluster for any signs of wear, fraying, or disconnections.
Secure any loose connections and repair damaged wires as needed.

4. Examine Fuses

Locate the fuse box (usually under the dashboard or in the engine compartment).
Use the fuse puller tool to remove and inspect the fuses related to the instrument cluster (refer to the owner's manual for specific fuse locations).
Replace any blown fuses with the same amperage rating.

5. Software Update

Connect the OBD-II scanner and check for any available software updates for the ECU.
Follow the manufacturer’s instructions to update the software, ensuring the vehicle is running during the update process.

6. Test Instrument Cluster

Reconnect the battery terminal and turn the ignition to the "on" position without starting the engine.
Use a multimeter to measure voltage at the instrument cluster connector; ensure it receives proper voltage (typically 12 volts).
If no voltage is detected, further investigation into the wiring or ECU may be required.