The Ford Focus is a popular compact car known for its reliability, fuel efficiency, and advanced safety features. However, like any other vehicle, it’s not immune to issues that can arise during its lifespan. One common problem reported by Ford Focus owners is the tail light going out when the brake is applied. This issue can be frustrating, especially if you’re driving at night or in low-light conditions. In this comprehensive guide, we’ll delve into the possible causes of this problem, provide troubleshooting steps, and offer solutions to get your Ford Focus back on the road.
Understanding the Problem
The tail light going out when the brake is applied is a relatively common issue in Ford Focus models, particularly those produced between 2012 and 2018. This problem can be caused by a faulty brake light switch, a malfunctioning tail light assembly, or a wiring issue. In some cases, it may be a sign of a more serious problem, such as a faulty brake system or a electrical issue.
Causes of the Problem
The following are some possible causes of the tail light going out when the brake is applied in a Ford Focus:
- Faulty Brake Light Switch: The brake light switch is responsible for activating the tail light when the brake pedal is pressed. A faulty switch can cause the tail light to go out when the brake is applied.
- Malfunctioning Tail Light Assembly: The tail light assembly can be faulty, causing the light to go out when the brake is applied.
- Wiring Issue: A wiring issue can cause the tail light to go out when the brake is applied.
- Brake System Issue: A faulty brake system can cause the tail light to go out when the brake is applied.
- Electrical Issue: An electrical issue can cause the tail light to go out when the brake is applied.
Diagnosing the Problem
To diagnose the problem, you’ll need to perform a series of tests to identify the cause of the issue. Here are some steps to follow:
Step 1: Check the Brake Light Switch
The brake light switch is usually located on the brake pedal or on the brake master cylinder. To check the switch, follow these steps:
- Locate the brake light switch and remove any trim or covers to access it.
- Use a multimeter to test the switch for continuity. Set the multimeter to the ohms function and touch the leads to the switch terminals.
- If the switch is faulty, it will not show continuity when the brake pedal is pressed.
Step 2: Check the Tail Light Assembly
The tail light assembly can be faulty, causing the light to go out when the brake is applied. To check the assembly, follow these steps: (See Also: How to Use Brake Cleaner for Squeaky Brakes? Silencing Your Ride)
- Locate the tail light assembly and remove any trim or covers to access it.
- Use a multimeter to test the tail light for continuity. Set the multimeter to the ohms function and touch the leads to the tail light terminals.
- If the tail light is faulty, it will not show continuity when the brake pedal is pressed.
Step 3: Check the Wiring
A wiring issue can cause the tail light to go out when the brake is applied. To check the wiring, follow these steps:
- Locate the wiring harness and follow it to the tail light assembly.
- Use a multimeter to test the wiring for continuity. Set the multimeter to the ohms function and touch the leads to the wiring terminals.
- If the wiring is faulty, it will not show continuity when the brake pedal is pressed.
Solutions
Based on the diagnosis, you can take the following steps to fix the problem:
Solution 1: Replace the Brake Light Switch
If the brake light switch is faulty, you’ll need to replace it with a new one. Here’s how:
- Locate the brake light switch and remove any trim or covers to access it.
- Disconnect the wiring harness from the switch.
- Remove the old switch and install a new one.
- Reconnect the wiring harness to the new switch.
Solution 2: Replace the Tail Light Assembly
If the tail light assembly is faulty, you’ll need to replace it with a new one. Here’s how:
- Locate the tail light assembly and remove any trim or covers to access it.
- Disconnect the wiring harness from the assembly.
- Remove the old assembly and install a new one.
- Reconnect the wiring harness to the new assembly.
Solution 3: Repair the Wiring
If the wiring is faulty, you’ll need to repair it. Here’s how:
- Locate the wiring harness and follow it to the tail light assembly.
- Use a multimeter to test the wiring for continuity. Set the multimeter to the ohms function and touch the leads to the wiring terminals.
- Identify the faulty wiring and repair or replace it as needed.
Recap
The tail light going out when the brake is applied in a Ford Focus can be caused by a faulty brake light switch, a malfunctioning tail light assembly, or a wiring issue. To diagnose the problem, you’ll need to perform a series of tests to identify the cause of the issue. Based on the diagnosis, you can take the following steps to fix the problem: replace the brake light switch, replace the tail light assembly, or repair the wiring. (See Also: At What Temperature Does Brake Fluid Freeze? When Winter Hits)
Frequently Asked Questions
FAQs
Here are some frequently asked questions related to the tail light going out when the brake is applied in a Ford Focus:
Q: What causes the tail light to go out when the brake is applied?
A: The tail light can go out when the brake is applied due to a faulty brake light switch, a malfunctioning tail light assembly, or a wiring issue.
Q: How do I diagnose the problem?
A: To diagnose the problem, you’ll need to perform a series of tests to identify the cause of the issue. This includes checking the brake light switch, the tail light assembly, and the wiring.
Q: What are the symptoms of a faulty brake light switch?
A: A faulty brake light switch can cause the tail light to go out when the brake is applied. Other symptoms may include a faulty brake pedal switch or a faulty brake warning light.
Q: Can I replace the brake light switch myself?
A: Yes, you can replace the brake light switch yourself. However, it’s recommended that you consult a professional mechanic if you’re not comfortable with DIY repairs. (See Also: What Is Non Voc Brake Cleaner? The Ultimate Guide)
Q: What are the costs associated with repairing the tail light?
A: The costs associated with repairing the tail light can vary depending on the cause of the problem. Replacing the brake light switch can cost between $50 and $200, while replacing the tail light assembly can cost between $100 and $500.
Q: Can I drive my Ford Focus with a faulty tail light?
A: No, it’s not recommended that you drive your Ford Focus with a faulty tail light. A faulty tail light can cause safety issues and may result in fines or penalties.