A Guide to the Brake Light Switch for the 2004-2010 Jaguar XJR
Understanding common brake light switch problems on your XJR and how to choose the right replacement part.
- Verify your model year before buying; 2004-2009 (X350) and 2010 (X351) use different part numbers.
- Symptoms like being stuck in Park or having non-working cruise control are strongly linked to this single part.
- A quality aftermarket switch from a brand like Standard Ignition is a cost-effective and reliable alternative to expensive OEM parts.
- Driving with a faulty brake light switch is a major safety hazard and should be addressed immediately.
Is Your Jaguar XJR Brake Light Switch Failing?
A faulty brake light switch is a common issue on the Jaguar XJ platform. Because this single part communicates with multiple vehicle systems, its failure can cause a confusing set of symptoms that may not seem related at first. Understanding these signs is key to a quick and accurate diagnosis.
Symptoms of a Bad Brake Light Switch
If the brake light switch on your XJR is failing, you will likely experience one or more of the following issues:
- Brake Lights Don't Work or Stay On: The most obvious sign is your brake lights not lighting up when you press the pedal, or they may be stuck on, draining your battery.
- Cannot Shift Out of Park: Your XJR requires a signal from the brake switch to allow the gear shifter to move out of the Park position. If this signal is missing, your shifter will be locked.
- Cruise Control Inoperative: The cruise control system relies on the brake switch to disengage. If the switch is faulty, it may send a constant 'brake on' signal, preventing the cruise control from activating.
- ABS or Traction Control Warning Lights: In some cases, a bad brake switch can confuse the stability and traction control systems, causing a warning light to appear on your dashboard.
Important Model Year Difference
The 2004-2010 Jaguar XJR spans two different chassis generations. It is critical to order the correct part for your specific year.
- 2004-2009 (X350 chassis): Uses OEM Part #C2C36874
- 2010 (X351 chassis): Uses OEM Part #C2P14525
Always verify the part number before purchasing. Using the wrong switch will not work.
Choosing the Right Aftermarket Brake Light Switch
When replacing the brake light switch, you have the choice between a Genuine Jaguar part (OEM) and an aftermarket part. For this specific component, a quality aftermarket part offers a reliable repair without the high cost of an OEM switch.
- OEM (Original Equipment Manufacturer): This is the same part you would get from a Jaguar dealership. It guarantees a perfect fit but comes at a premium price.
- Standard Ignition (Standard Motor Products): This is a well-regarded aftermarket brand with a long history of producing reliable replacement electrical parts. Their switches are designed to meet or exceed original specifications and are a trusted choice for resolving common failure points.
- Rostra Powertrain: While Rostra is a known manufacturer of automotive electronics, their specific brake light switches for the Jaguar XJR are not as commonly found or reviewed as other brands. If considering this brand, double-check that the part number is a direct cross-reference to your vehicle's OEM number.
Cost of Replacing the Brake Light Switch
| Part Type | Estimated Cost |
|---|---|
| New OEM | $48 - $70 |
| New Aftermarket | $21 - $54 |
| Used OEM | $10 - $25 |
| Shop Labor | $108 - $158 |
A Note on Installation
Replacing the brake light switch is a task a DIY-er can handle, but be prepared for a challenge. The switch is located in a very tight space above the brake pedal, requiring you to work in an awkward position in the driver's footwell. Many owners find this job frustrating due to the limited access.
Frequently Asked Questions (FAQ)
Is it safe to drive with a bad brake light switch?
No. If your brake lights are not working, other drivers will not know you are slowing down or stopping, which is extremely dangerous. If the lights are stuck on, it can confuse other drivers and drain your battery. This repair should be done immediately.
Are there any recalls for the XJR brake light switch?
No, there are no specific recalls from the NHTSA for the brake light switch on the 2004-2010 Jaguar XJR. A recall for 2004 models (NHTSA 09V144) concerned brake pipe corrosion, not the electrical switch itself.
Can I just adjust the switch instead of replacing it?
In some rare cases, the switch may just be out of adjustment. However, the internal components of the switch are known to wear out and fail. Given the low cost of a new part and the difficult labor involved, it is almost always better to replace the entire switch rather than risk having to do the job again soon.
Why are my ABS and brake warning lights on?
Modern safety systems like ABS and traction control use the brake switch signal to understand what the driver is doing. If the signal is incorrect or missing, the system may default to a fault mode and turn on a warning light. Replacing the faulty brake light switch will often resolve these warning lights.
Technical Specifications
OEM Part Numbers: C2C36874 C2P14525
Located on the brake pedal bracket. Typically a 4-pin electrical connector. Operates brake lights, cruise control disengage, and shift interlock.
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.
- Jaguar XJR: