Toyota Corolla E170 (2013-2019) headlights flicker when driving at night, what's the issue?

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

499 words

Problem Statement

Learn how to diagnose and fix flickering headlights in Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect battery before working on electrical systems.
•Allow the vehicle to cool before accessing electrical components.

Symptoms

•Headlights flickering while driving
•Dimming of dashboard lights
•Electrical accessories behaving erratically
•Possible check engine light illuminated
•Increased frequency of headlight bulb failures

Diagnostic Steps

1
Inspect the headlight bulbs for signs of wear or damage.
2
Check the headlight fuses for continuity and integrity.
3
Use an OBD-II scanner to check for any stored error codes related to the electrical system.
4
Test the vehicle's battery voltage and charging system output using a multimeter.
5
Inspect the headlight wiring harness and connectors for corrosion or loose connections.
6
Examine the grounds associated with the headlight circuit for any signs of corrosion or poor contact.

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
•Screwdriver set
•Fuse puller

Parts Required

•Headlight bulbs
•Fuses

Related Faults

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Diagnostic Steps

1
Inspect the headlight bulbs for signs of wear or damage.
2
Check the headlight fuses for continuity and integrity.
3
Use an OBD-II scanner to check for any stored error codes related to the electrical system.
4
Test the vehicle's battery voltage and charging system output using a multimeter.
5
Inspect the headlight wiring harness and connectors for corrosion or loose connections.
6
Examine the grounds associated with the headlight circuit for any signs of corrosion or poor contact.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect and Replace Headlight Bulbs

Remove the headlight assembly by unscrewing the retaining screws and releasing any clips.
Disconnect the electrical connector from the back of the headlight bulb.
Remove the old bulb and install a new one, ensuring it is the correct type (e.g., H11 for low beams).
Reconnect the electrical connector and reassemble the headlight assembly.

3. Check and Replace Fuses

Locate the fuse box (usually under the dashboard or in the engine compartment).
Remove the headlight fuse using a fuse puller or pliers.
Inspect the fuse for continuity and replace it if blown with the same amperage rating.

4. Test Battery and Charging System

Using a multimeter, check the battery voltage (should be around 12.6 volts when the vehicle is off).
Start the engine and check the voltage again (should be between 13.7 to 14.7 volts).
If the voltage is low, consider testing the alternator and connections for proper function.

5. Inspect Wiring and Ground Connections

Visually inspect the wiring harness for signs of wear, fraying, or damage.
Clean any corroded connectors with electrical contact cleaner.
Ensure all ground connections related to the headlight circuit are secure and free of corrosion.