GM GENUINE PARTS Brake Light Switch D1539J (25981009) — OE-fit replacement with factory connector and precise pedal engagement

The GM Genuine Parts D1539J (25981009) Brake Light Switch is the OEM-standard electrical switch that activates your brake lights when you press the brake pedal.

This replacement brake light switch is engineered and validated by General Motors to match the original factory component’s fit, function, and durability. Designed to interface with a vehicle’s electronics, the switch helps ensure brake lights illuminate reliably and that related vehicle systems receive correct signals. Whether replacing a failed switch or restoring proper brake-light operation after repairs, this GM Genuine Parts unit follows GM OE specifications.

How does this switch restore proper brake light function?

The D1539J completes the electrical circuit when the brake pedal is depressed, sending a signal to illuminate the brake lamps. Because it’s manufactured to GM’s OE standards, it aligns with the original mounting points and electrical connectors to simplify installation and reduce troubleshooting time.

• Direct electrical replacement for compatible GM vehicles
• Matches original connector and actuator dimensions
• Engineered to engage precisely with pedal travel

Will this part integrate with vehicle electronics and safety systems?

This GM Genuine switch is designed to work with the vehicle’s existing electronics so brake lamp signals and related inputs are consistent with factory behavior. It supports systems that rely on brake switch signals, such as cruise control disengagement, shift-interlock sensors, and onboard diagnostics.

• Compatible with electronic modules that monitor brake input
• Helps maintain correct diagnostic readings and fault codes
• Manufactured to GM OE specification for reliable electrical contact

How straightforward is installation for a DIYer or technician?

Installation is typically straightforward because the D1539J is built to match the original switch’s form and mounting. Many replacements require only basic hand tools, aligning the switch plunger with the pedal bracket and reconnecting the factory wiring harness. Still, follow vehicle-specific repair instructions and safety precautions.

• Factory-style connector for plug-and-play replacement
• No special programming generally required for most GM vehicles
• Recommended to verify pedal travel and switch adjustment after fitment

What quality assurances and benefits come with GM Genuine Parts?

GM Genuine Parts carry the engineering and validation backing of General Motors and are often the original equipment used during vehicle assembly. This means the part is manufactured and tested to the tolerances and durability expectations set by GM, offering compatibility and longevity comparable to the factory-installed component.

• Designed and tested to GM specifications for fit, form, and function
• Recommended by GM as a replacement for the original factory component
• Offers the reliability and durability associated with OE-level parts

Who is this for: The GM Genuine Parts D1539J (25981009) Brake Light Switch is intended for GM owners, fleet technicians, and independent mechanics who need a reliable, OE-spec replacement. It suits anyone repairing brake-light faults, restoring proper brake-signal communication with vehicle electronics, or maintaining a vehicle to OEM standards.

Features:

• Work with vehicle electronics to help optimize vehicle capabilities
• GM-recommended replacement part for your GM vehicle’s original factory component
• Offering the quality, reliability, and durability of GM OE
• Manufactured to GM OE specification for fit, form, and function