NISSAN 25240-2X901 Stop Lamp Switch

The genuine NISSAN (SKU: 25240-2X901) stop lamp switch (brake light switch) is an essential safety and electrical component that establishes a direct connection between the mechanical movement of the brake pedal and the vehicle's electrical signaling systems. Its primary function is to immediately close the circuit at the slightest depression of the brake pedal, activating the rear brake lights to alert following traffic to deceleration or stopping.

Technical Features and Construction

This premium genuine (OEM) part is manufactured according to the strictest automotive standards, ensuring long service life and flawless electrical conductivity. The switch features a robust plastic housing and wear-resistant internal contacts that withstand continuous mechanical stress and temperature fluctuations.

• Product Type: Stop lamp switch / Brake light switch
• Manufacturer: NISSAN (Genuine OEM part)
• Operating Principle: Mechanical, spring-loaded contact
• Installation Location: At the pedal bracket above the brake pedal
• Connection: Stable, vibration-resistant electrical connector socket for secure contact

The Role of the Stop Lamp Switch in Modern Vehicles

In modern vehicles, the function of the stop lamp switch extends far beyond simply turning on the brake lights. The electrical signal transmitted by this component serves as critical input data for several electronic control units:

• Anti-lock Braking and Electronic Stability Program (ABS/ESP): The system must immediately detect when the driver is braking in order to optimize brake pressure when required.
• Cruise Control: Touching the brake pedal causes the switch to immediately disengage cruise control for safe deceleration.
• Automatic Transmission: On many models, depressing the brake pedal is required to shift the selector lever out of the "P" (Park) position.
• Engine Control Unit (ECU): On certain models, it monitors simultaneous brake and accelerator pedal inputs for safety override functions.

Common Symptoms of Failure

The stop lamp switch is subject to natural wear and tear. Burnt or oxidized internal contacts, or fatigue of the internal spring, can result in the following symptoms:

• Brake lights do not illuminate at all when the brake pedal is depressed (hazardous driving condition).
• Brake lights remain illuminated continuously, even when stationary with the pedal released (can drain the battery).
• Warning lights illuminated on the dashboard (e.g., ABS, ESP, or Check Engine light).
• Cruise control cannot be engaged.
• On automatic transmission vehicles, the gear selector remains stuck in the "P" position.

To ensure driving safety and the proper operation of the vehicle's electronics, a defective switch should be replaced immediately with a reliable, genuine OEM component.