Infiniti FX35 (2003-2012) Brake Light Switch: Symptoms and Replacement
Having issues with your brake lights, starting, or warning lights? Your brake light switch might be the culprit.
- A bad brake light switch is a common cause for VDC OFF and SLIP lights on the FX35 dashboard.
- Symptoms include brake light failure, inability to shift from Park, and no-start conditions on push-button models.
- Before replacing the switch, always check the brake fluid level and the relevant fuse first.
- Replacement is a simple, inexpensive DIY task that can be completed in under 30 minutes.
Is Your Infiniti FX35 Brake Light Switch Failing?
A faulty brake light switch on the 2003-2012 Infiniti FX35 can cause a range of confusing electrical problems. Because this part is tied into so many different systems, its failure often mimics other, more serious issues. Understanding the specific symptoms can save 🎬 Watch this overview of common bad brake light switch symptoms. you from incorrect and costly repairs.
Recall Information
While there isn't a specific recall listed for the brake light switch on the 2003-2012 FX35 itself, Nissan/Infiniti has issued recalls for similar models of the same era due to faulty brake light switches with poor internal solder joints. These defects could cause brake lights to fail or stay on, increasing crash risk. Given the shared parts and manufacturing period, it's a known issue for this platform. Additionally, numerous recalls for Takata airbags have been issued for these model years, and owners should verify their vehicle's status with an Infiniti dealer.
Common Symptoms of a Bad Brake Light Switch
- Brake Lights Don't Work or Stay On: The most obvious sign is when your brake lights either fail to illuminate when you press the pedal or remain on even after you release it.
- VDC OFF and SLIP Lights on Dash: Many FX35 owners report that the "VDC OFF" and "SLIP" warning lights appear on the dashboard when the brake light switch fails. This happens because the Vehicle Dynamic Control system relies on the brake signal to function correctly.
- Cannot Shift Out of Park: The switch sends a signal to the shift interlock. If this signal is missing, your gear selector will be stuck in Park as a safety measure.
- Push-Button Start Issues: On later models, a bad switch can prevent the engine from starting because the vehicle doesn't receive the signal that the brake pedal is depressed.
- Cruise Control Malfunctions: The cruise control may not engage or may disengage unexpectedly.
Pro Tip: Before replacing the switch, check two simple things. First, ensure your brake fluid level is not low, as this can also trigger the BRAKE, VDC, and SLIP lights. Second, check the brake light fuse to make sure it hasn't blown.
Choosing the Right Aftermarket Replacement
For the FX35, the brake light switch is a simple part, but choosing a quality replacement is important to avoid recurring problems. You don't necessarily need to pay for a genuine OEM part from the dealer.
- Premium Aftermarket (e.g., Standard Ignition, Beck Arnley, Vemo): Brands like Standard Motor Products (SMP) are often considered OE-equivalent or better and are a reliable choice. They focus on quality materials and testing to ensure longevity. Beck Arnley is also known for sourcing parts that match the original's form and function.
- Standard Aftermarket (e.g., Dorman, Holstein): Dorman is a well-known brand that often provides direct-fit replacements for common failure items. While some mechanics have mixed opinions on Dorman's overall quality, for a simple switch like this, it is generally considered an acceptable and cost-effective option.
- Economy (e.g., URO Parts, Replacement): These are the most budget-friendly options. They will get the job done, but their long-term durability may not match that of premium brands due to potentially lower-quality internal components.
Replacement Cost
Replacing the brake light switch is an inexpensive repair, especially if you do it yourself. The part itself is affordable, and labor is minimal due to easy access.
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket | $24 - $78 |
| Shop Labor | $49 - $72 |
| Total (DIY) | $24 - $78 |
| Total (at a shop) | $73 - $150 |
Frequently Asked Questions (FAQ)
Is it hard to replace the FX35 brake light switch myself?
No, this is a very feasible DIY job for most owners. The switch is located above the brake pedal arm and is typically held in place by a nut. It involves unplugging the electrical connector, unscrewing the old switch, and screwing the new one in. You may need to make a small adjustment to ensure the brake lights activate and deactivate at the correct pedal travel. The entire process usually takes less than 30 minutes.
🎬 Follow this step-by-step guide to replace your brake light switch.My VDC and SLIP lights are on. Is it definitely the brake light switch?
It's a very common cause, but not the only one. As mentioned, low brake fluid is another frequent trigger for these lights on the FX35. Other potential causes include a faulty wheel speed sensor or a problem with the steering angle sensor. However, given the low cost and high failure rate of the brake light switch, it's often the most logical first part to replace when these symptoms appear together.
What happens if I don't replace a bad brake light switch?
Continuing to drive with a faulty brake light switch is a serious safety risk. If your brake lights don't work, drivers behind you won't know you are slowing down or stopping, which can easily lead to a rear-end collision. If the switch fails in the 'on' position, it can confuse other drivers and drain your battery. You could also be left stranded if you can't shift out of park or start your car.
Is there a difference in the switch between the 2003-2008 and 2009-2012 models?
Yes, the part numbers can differ between the first generation (S50) and second generation (S51) FX35. For example, one common OEM part number is 25320-AX10A, while another is 25320-JN00A. It is essential to use a fitment tool and enter your vehicle's specific year to ensure you are purchasing the correct switch with the right connector and threading.
Helpful Videos
Technical Specifications
OEM Part Numbers: 25320-AX10A 25320-JN00A
4-Pin, Blade Type Connector, Threaded Mount
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- INFINITI FX35: