my Toyota Corolla E140 (2006-2013) fog lights not working what could be wrong

Solution

1. Preparation

• Gather necessary tools: multimeter, socket set, and a replacement fog light bulb if needed.
• Ensure the vehicle is parked on a flat surface and the engine is off.

2. Check the Fog Light Switch

• Remove the switch panel using a trim removal tool.
• Disconnect the switch connector and use a multimeter to test for continuity when the switch is activated.
• If the switch is faulty, replace it with a new one.

3. Inspect Fog Light Bulbs

• Remove the fog light assembly from the vehicle.
• Twist and pull the bulb socket out of the assembly.
• Inspect the bulb for any signs of damage; replace if necessary.
• Ensure the new bulb is of the correct type (usually H11 for this model).

4. Test Voltage at Fog Light Connectors

• Reconnect the fog light assembly without securing it.
• Use a multimeter to check for voltage at the connectors while the fog light switch is on.
• If there is no voltage, further investigation of the wiring is needed.

5. Check the Fog Light Fuse

• Locate the fuse box (typically found under the dashboard or in the engine compartment).
• Identify the fog light fuse using the diagram on the fuse box cover.
• Remove the fuse and inspect it for continuity. Replace with the same amperage if blown.

6. Inspect Wiring and Connectors

• Follow the wiring harness from the fog lights to the switch and relay.
• Look for any signs of fraying, corrosion, or disconnections.
• Repair or replace damaged wiring as necessary.

7. Verify Relay Operation

• Locate the fog light relay in the fuse box.
• Swap the relay with another identical relay (e.g., horn relay) to test functionality.
• If the fog lights work with the swapped relay, replace the faulty relay.