Brake Light Switch

Replace the brake light switch located on the brake pedal assembly to restore proper brake light function and ensure safe operation of the vehicle's brake lighting system.

Warnings

Tools required

Parts

• Brake light switch × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn vehicle completely OFF and remove key fob from vehicle interior
3. Ensure transmission is in Park
4. Open driver's door and prepare adequate lighting to view under dashboard area
5. Adjust driver's seat fully rearward for maximum access to pedal assembly
6. Allow vehicle to sit for at least 2 minutes to ensure all systems are powered down

Procedure

1. 1

   Locate the brake light switch
   Position yourself in the driver's footwell with adequate lighting. The brake light switch is mounted on a bracket at the top of the brake pedal arm, near where the pedal pivots. It is a small cylindrical or rectangular component with an electrical connector and a plunger that contacts the brake pedal arm.
2. 2

   Disconnect the electrical connector
   Locate the electrical connector attached to the brake light switch. Press the release tab on the connector while pulling it straight away from the switch body. If access is restricted, you may need to rotate the connector or use needle-nose pliers to depress the locking tab. Do not pull on the wiring harness itself.
3. 3

   Remove the brake light switch
   The switch is typically retained by either a quarter-turn twist lock mechanism or a push-in clip. If twist-lock type: rotate the switch body counterclockwise approximately 1/4 turn (90 degrees) and pull straight out from the mounting bracket. If clip type: depress the retaining clips on the sides of the switch body while pulling the switch straight out. Note the orientation and position of the switch for proper installation of the replacement.
4. 4

   Prepare the new brake light switch
   Remove the new brake light switch from its packaging. Verify it matches the removed switch in connector type and body configuration. Some switches come with the plunger fully extended; do not compress the plunger manually. If the switch has a locking collar or adjustment feature, ensure it is in the unlocked position for installation.
5. 5

   Install the new brake light switch
   Align the new switch with the mounting bracket, ensuring the plunger faces toward the brake pedal arm contact point. Push the switch firmly into the mounting bracket until you feel or hear it click into place. If twist-lock type: insert the switch and rotate clockwise 1/4 turn until it locks. Verify the switch is fully seated and cannot be pulled out without releasing the retention mechanism.
6. 6

   Connect the electrical connector
   Push the electrical connector onto the brake light switch terminal until you hear or feel a positive click. Gently tug on the connector to verify it is securely latched. Ensure the wiring harness is not pinched, kinked, or in contact with any moving pedal components.
7. 7

   Verify switch plunger adjustment
   With the brake pedal in the fully released position, verify the brake light switch plunger is compressed by the pedal arm or stop pad. There should be minimal gap between the pedal arm and the switch plunger. Many switches are self-adjusting and will calibrate when the pedal is first depressed. If the switch has a manual adjustment collar, adjust until the plunger just contacts the pedal arm with the pedal released.

Reassembly

1. Return the driver's seat to the normal operating position
2. Ensure no tools or parts remain in the driver's footwell area
3. Close the driver's door

Verification

• Place the key fob in the vehicle and turn the ignition to ON (do not start the vehicle initially)
• Verify the brake warning light on the instrument cluster illuminates and then extinguishes as expected
• Have an assistant observe the rear brake lights while you depress the brake pedal, or use a reflection in a window or garage door. All brake lights should illuminate immediately when the pedal is depressed and extinguish when released
• Verify brake lights function in both ON and READY modes
• Test that the vehicle will shift out of Park only when the brake pedal is depressed (shift interlock function)
• If equipped with cruise control, verify it disengages immediately when the brake pedal is depressed during a test drive
• Check for any warning lights on the instrument cluster related to brake system or electronic stability control
• Verify regenerative braking coordination feels normal during a test drive with no unusual pedal feel or delayed response
• If any brake lights do not function or warning lights remain illuminated, re-check connector engagement and switch installation before operating the vehicle on public roads

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