The Lincoln LS is known for its luxurious ride and powerful engine. However, like any vehicle, it can experience its share of electrical gremlins. One such issue is the dreaded “Foot on Brake” warning, even when the brake pedal isn’t pressed. This can be a frustrating and potentially dangerous problem, as it can prevent you from shifting out of park or starting your car altogether.
This comprehensive guide will delve into the common causes of this warning in your Lincoln LS, focusing specifically on the sensor location and providing you with the knowledge to diagnose and potentially fix the issue yourself.
Understanding the Foot on Brake Warning System
Before we dive into the sensor location, it’s crucial to understand how the system works. The “Foot on Brake” warning is a safety feature designed to ensure the vehicle doesn’t move unexpectedly.
The system relies on several components, including:
- Brake Pedal Position Sensor: This sensor, often located above the brake pedal arm, detects when the brake pedal is pressed. It sends a signal to the vehicle’s computer, indicating that it’s safe to shift out of park or start the engine.
- Transmission Range Sensor: This sensor tells the vehicle’s computer what gear the transmission is in. If the computer doesn’t receive a signal from the brake pedal sensor, it won’t allow the car to shift out of park.
- Vehicle Control Module (VCM): The VCM is the brain of your Lincoln LS. It receives signals from various sensors, including the brake pedal position sensor. If the VCM detects a problem with the signal, it will trigger the “Foot on Brake” warning.
Lincoln LS Foot on Brake Warning Sensor Location
In the Lincoln LS, the brake pedal position sensor, a common culprit for this issue, is typically located above the brake pedal arm, attached to the brake pedal assembly under the dashboard. It’s a relatively small, black, rectangular component with a wiring harness connected to it.
Common Causes of the “Foot on Brake” Warning
Now that you know where to find the brake pedal position sensor let’s explore the common reasons it might be triggering the warning:
- Faulty Brake Pedal Position Sensor: Over time, the sensor can wear out, become misaligned, or accumulate dirt and debris, hindering its ability to send a clear signal.
- Damaged Wiring Harness: The wiring harness connected to the sensor can become frayed, corroded, or damaged, disrupting the signal flow.
- Brake Pedal Adjustment Issues: In some cases, the brake pedal itself might be misadjusted, preventing the sensor from engaging properly.
- Faulty Transmission Range Sensor: Although less common, a malfunctioning transmission range sensor can also cause this warning.
- VCM Software Glitch: Rarely, a software glitch in the VCM might trigger a false “Foot on Brake” warning.
Troubleshooting the “Foot on Brake” Warning in your Lincoln LS
Before you rush to a mechanic, here’s a step-by-step guide to help you diagnose and potentially fix the problem yourself:
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Visual Inspection:
- Begin by visually inspecting the brake pedal position sensor and its wiring harness for any visible damage, such as loose connections, frayed wires, or corrosion.
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Sensor Testing (Multimeter Required):
- If the visual inspection doesn’t reveal any issues, you can use a multimeter to test the sensor’s functionality.
- Consult your Lincoln LS repair manual for specific resistance values and testing procedures.
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Brake Pedal Adjustment:
- Check if the brake pedal feels unusually high or low.
- Consult your repair manual for the correct brake pedal free play and adjust accordingly if necessary.
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Cleaning the Sensor:
- Carefully clean the brake pedal position sensor using electrical contact cleaner and a soft brush.
- Ensure the sensor is dry before reconnecting it.
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Software Update:
- If the problem persists, it’s possible that your Lincoln LS requires a VCM software update. You can contact your local Lincoln dealership or a qualified mechanic to inquire about available updates.
When to Seek Professional Help
While the steps above can help you diagnose and potentially fix the “Foot on Brake” warning, some situations warrant the expertise of a qualified mechanic. These include:
- You’ve exhausted all troubleshooting steps without success.
- You’re uncomfortable working with electrical components.
- The issue seems to be related to the transmission range sensor or the VCM, which require specialized tools and knowledge.
Conclusion
The “Foot on Brake” warning in your Lincoln LS can be a nuisance, but understanding its causes and knowing how to troubleshoot it can save you time and money. By following this guide, you’ll be well-equipped to tackle this common issue. Remember, if you’re ever in doubt, it’s always best to err on the side of caution and consult a qualified mechanic.
