The brake light switch on a 2016 Ford Fusion is mounted on the brake pedal assembly in the driver’s footwell; it’s a plunger-style switch that the pedal presses to illuminate the rear brake lights.
In more detail, Ford places the stop light switch near the top of the brake pedal bracket inside the driver’s side dash area. Access typically requires removing or loosening a portion of the lower dash or knee bolster to reach the switch and its two-wire harness. This guide explains how to locate, test, adjust, and replace the brake light switch on a 2016 Fusion if your brake lights fail to come on when you press the pedal.
Location and access
To locate the brake light switch on a 2016 Fusion, follow these steps to identify its exact position in the driver’s footwell:
- Park the car, turn off the ignition, and sit in the driver's seat to access the footwell area.
- Move aside the driver's floor mat and inspect the brake pedal assembly at the top of the pedal arm where it pivots.
- Look for a small rectangular or cylindrical switch mounted to the brake pedal bracket or the nearby dash/brace with a two-wire connector feeding into the switch.
- Note that the switch is actuated by the brake pedal: pressing the pedal moves the plunger and closes the circuit to illuminate the brake lights.
- In some trim levels, you may need to loosen or remove a portion of the knee bolster or lower dash panel to gain clear access to the switch.
Access can vary slightly by trim, but in all cases the switch sits close to the pedal bracket in the driver’s footwell and is wired to the brake light circuit.
Safety and service considerations
When working near the brake pedal, avoid sudden movements and be cautious of the airbag system and related trim. If you’re ever unsure, consult a professional technician or consult the vehicle’s service manual for model-specific guidance.
Testing and adjusting or replacing the switch
These steps help you verify the switch’s operation and determine whether you should adjust it or replace it to restore proper brake light function:
- Turn the ignition to ON (do not start the engine) and press the brake pedal to observe whether the rear brake lights illuminate. If they do, the switch is functioning at least intermittently.
- Inspect the two-wire harness connected to the switch for signs of wear, corrosion, or loose connections. Secure any loose plugs and replace damaged wiring as needed.
- With the pedal at rest, inspect the switch plunger for proper extension. Gently press the pedal and observe the plunger movement; the plunger should visibly depress when the pedal is pressed and return when released.
- Disconnect the wiring connector from the switch. Use a multimeter set to continuity to test the switch: with the pedal released, there should be no continuity; with the pedal pressed, continuity should appear (or follow the brake-light circuit test you prefer).
- If the switch is faulty or intermittent, replace it. Obtain the correct Ford part for the 2016 Fusion and install it by reconnecting the harness and re-checking operation.
- To adjust the switch, loosen the mounting screws, reposition the switch so that the plunger is fully depressed when the pedal is pressed and fully extended when released, then retighten the screws. Re-test the brake lights by pressing the pedal to confirm consistent operation.
- Reconnect all connectors, reinstall any trim panels, and perform a final test: with the ignition ON, press and release the brake pedal several times to ensure the brake lights illuminate reliably and switch off when released.
Conclusion: If the brake lights still do not illuminate after adjusting or replacing the switch, the problem may lie elsewhere in the circuit, such as fuses, wiring, or bulbs, and a technician should diagnose the system further.
Summary
On a 2016 Ford Fusion, the brake light switch is located on the brake pedal bracket in the driver’s footwell. It is a plunger-style switch actuated by the brake pedal and wired to the brake light circuit. Access may require removing a portion of the lower dash or knee bolster. To diagnose, locate the switch, check the wiring, test continuity with the pedal pressed, and adjust or replace the switch as needed. If problems persist after testing, pursue a broader electrical diagnosis to rule out fuses or wiring faults.