INFINITI M35 Brake Light Switch Guide (2006-2010)
Fix brake light, starting, and shifting problems by understanding this critical part.
- A faulty brake light switch is a critical safety issue that can cause your brake lights to fail, prevent your car from starting, or get it stuck in Park.
- This is a simple and inexpensive DIY repair, typically taking less than 30 minutes with basic tools.
- When replacing, check the small plastic stopper on the brake pedal arm, as a broken stopper can mimic the symptoms of a bad switch.
- Proper adjustment of the new switch is crucial for correct operation of the brake lights, cruise control, and starting system.
Is a Failing Brake Light Switch a Serious Problem?
Yes, a faulty brake light switch can be a serious issue. If your brake lights don't work, other drivers won't know you're stopping, which significantly increases the risk of a rear-end collision. Additionally, a bad switch can prevent you from starting your M35 or shifting it out of Park, potentially leaving you stranded. Because this part is tied to so many critical vehicle functions, it's important to address symptoms immediately.
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 light up when you press the pedal or stay illuminated even when your foot is off the brake.
- Car won't start: For the push-button ignition to work, the system needs to confirm the brake is pressed. A bad switch can prevent this signal, so the engine won't crank.
- Can't shift out of Park: The safety interlock requires a signal from the brake switch to release the gear shifter. Without it, your shifter will be stuck.
- ABS or VDC/Slip warning lights on dash: The stability control (VDC) and anti-lock brake (ABS) systems use the brake switch signal. A faulty switch can trigger error lights on your dashboard.
- Cruise control won't engage or disengages randomly: The cruise control system relies on the switch to know when to turn off. A bad switch can prevent it from working correctly.
Recall Information
While there was no specific recall for the brake light switch on the 2006-2010 INFINITI M35, a similar issue on other Nissan models involved contamination of the switch contacts from off-gassing grease in nearby components. This led to oxidation and failure. Although the M35 was not included, this highlights a potential failure mode for these types of switches. Always check for the latest recall information with your VIN on the NHTSA website.
Choosing the Right Aftermarket Brake Light Switch
When replacing the brake light switch, you have several aftermarket options that offer a good balance of quality and value compared to the OEM part. The original part number for many of these vehicles is 25320-AX10A or a superseding number. Aftermarket parts are designed to meet or exceed these original specifications.
Brand Tiers
- Premium Brands (Beck Arnley, Standard Ignition, Vemo): These brands are well-regarded in the aftermarket. Standard Motor Products (Standard Ignition) and Beck Arnley often source from OEM manufacturers and have a reputation for high quality and reliability. They are an excellent choice for a fit-and-forget repair.
- Mid-Grade Brands (Dorman, Holstein, Facet): Dorman is a widely available brand that often provides reliable, direct-fit replacements. While some mechanics have mixed opinions on Dorman's overall quality, a simple switch is generally a safe bet. Holstein and Facet also offer dependable options in this price range.
- Value Brands (URO Parts, True Tech, Replacement): These brands provide a budget-friendly solution. For a simple part like a brake light switch, they can be a cost-effective option, but may not have the same long-term durability as premium brands. A forum user noted an issue with an inexpensive aftermarket switch not fitting the electrical connector correctly, so be sure to verify fitment.
Pro Tip: Proper adjustment is critical. After installing the new switch, make sure it is adjusted correctly. The switch's plunger must be fully depressed when the pedal is at rest and release immediately when the pedal is pressed. Incorrect adjustment can cause the same symptoms as a failed switch.
Cost of Replacing an INFINITI M35 Brake Light Switch
| Item | Estimated Cost |
|---|---|
| OEM Part | $45 - $70 |
| Aftermarket Part | $24 - $68 |
| Shop Labor | $37 - $100 |
| Total Professional Replacement | $87 - $170 |
Cost estimates are based on national averages and may vary by location and shop.
Frequently Asked Questions
Can I replace the brake light switch myself?
Yes, this is a very DIY-friendly repair. The switch is located on the brake pedal bracket under the dashboard. It typically requires removing a small trim panel for access, disconnecting the electrical connector, and then twisting or unbolting the switch to remove it. The entire job can usually be done in under 30 minutes with basic tools.
Are there any other parts I should check?
If replacing the switch doesn't solve the problem, check the brake light fuse first. Also, inspect the small plastic or rubber stopper on the brake pedal arm that physically presses the switch's plunger. These stoppers can become brittle and break, causing the switch to think the pedal is always pressed, which keeps the brake lights on and can drain your battery.
Is there a difference between the brake light switch and the cruise control switch?
Yes, on many INFINITI M35 models, there are two switches on the brake pedal assembly. One is the primary stop lamp switch that controls the brake lights and shift interlock. The other is a cruise control cancellation switch. They look similar but have different functions. Make sure you are replacing the correct one. The stop lamp switch is the one that, when it fails, causes the more serious issues like no-start or no brake lights.
Why did my aftermarket switch fail so quickly?
Early failure of an aftermarket switch can be due to a few factors. Sometimes it's a quality control issue with a budget part. However, it can also be caused by high electrical load burning out the internal contacts, a problem that can affect any brand. In some cases, an owner on a forum reported an aftermarket switch did not fit the electrical connector properly, highlighting the importance of checking the part upon receipt.
Technical Specifications
OEM Part Numbers: 25320-AX10A 25320-AX00C 25320-AX00E 25320-AX00B 25320-AX00A 25320-AX000 25320-9AE0A
Located on the brake pedal support bracket. Typically a 4-pin, rectangular female connector. Functions as a plunger-style, normally closed switch.
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 M35: