my Toyota Corolla E170 (2013-2019) fog lights won't turn on what should I check

Toyota Corolla E170 (2013-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

3 min read

581 words

Problem Statement

Discover how to diagnose and fix fog lights not working on Toyota Corolla E170 (2013-2019). Step-by-step guide with diagnostic steps and solutions.

Affected Component

Electrical

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent short circuits.

Symptoms

•Fog light switch does not illuminate
•No light output from fog lights when activated
•Dashboard warning light for fog lights remains off
•Other exterior lights function normally
•No unusual sounds when the fog light switch is engaged

Diagnostic Steps

1
Check the fog light switch for proper operation and illumination.
2
Inspect the fog light bulbs for signs of failure or burnout.
3
Test the fog light fuse in the fuse box for continuity.
4
Measure voltage at the fog light connectors using a multimeter.
5
Examine the wiring and connectors for any damage or corrosion.
6
Verify the fog light relay operation by swapping it with a similar relay.

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
•Flathead screwdriver

Parts Required

•Fog light bulbs (H11 type)
•Fog light fuse (15A)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Check the fog light switch for proper operation and illumination.
2
Inspect the fog light bulbs for signs of failure or burnout.
3
Test the fog light fuse in the fuse box for continuity.
4
Measure voltage at the fog light connectors using a multimeter.
5
Examine the wiring and connectors for any damage or corrosion.
6
Verify the fog light relay operation by swapping it with a similar relay.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, and a flathead screwdriver.
Ensure the vehicle is parked on a flat surface with the engine off and key removed.

2. Inspect the Fog Light Bulbs

Locate the fog light assemblies, typically found at the front of the vehicle.
Remove the fog light cover if necessary, using a flathead screwdriver to pry it off.
Unscrew the fog light bulb from the socket and visually inspect it for any signs of damage (burnt filament).
Replace the bulb if it appears burnt out. Use the correct type (usually H11 for the Corolla E170).

3. Check the Fog Light Fuse

Open the fuse box located under the dashboard or in the engine compartment.
Locate the fog light fuse (consult the owner's manual for the exact location).
Remove the fuse and inspect it for a broken filament. If blown, replace with a fuse of the same amperage (typically 15A).

4. Test the Fog Light Relay

Identify the fog light relay in the fuse box (refer to the owner's manual).
Remove the relay and inspect for signs of damage.
Swap the fog light relay with a similar relay (e.g., horn relay) to see if the fog lights activate.

5. Check for Voltage at Fog Light Connectors

Using a multimeter, set it to measure DC voltage.
With the fog light switch on, probe the fog light connector wires to check for voltage.
If no voltage is detected, trace the wiring back to the switch and relay for continuity.

6. Inspect Wiring and Connectors

Visually inspect the wiring harness leading to the fog lights for wear, fraying, or corrosion.
Clean any corroded connectors and ensure all connections are secure.
Repair or replace any damaged wiring as necessary.