Replace the brake light switch located on the brake pedal assembly to restore proper brake light and shift interlock function.

Warnings

Tools required

Parts

• Brake light switch × 1 — 84340-02070 or equivalent OEM

Preparation

1. Park vehicle on level surface and engage parking brake
2. Turn ignition to OFF position and remove key fob from vehicle interior
3. Allow at least 90 seconds for airbag system to discharge before working near steering column
4. Adjust driver's seat fully rearward to provide maximum access to pedal area
5. Gather adequate lighting as the work area under dashboard is dark and confined

Procedure

1. 1

   Access the brake pedal assembly
   Position yourself in the driver's footwell. Use flashlight to locate the brake light switch, which is mounted on a bracket above the brake pedal arm. The switch has a white or black plastic body with an electrical connector and pushrod that contacts the brake pedal. You may need to remove the lower dash panel for better access on some trim levels - if present, locate plastic clips and carefully pry panel downward.
2. 2

   Disconnect the electrical connector
   Locate the electrical connector on the brake light switch body. Press the locking tab on the connector (usually on top or side) and pull the connector straight off the switch. Do not pull on the wires themselves. If connector is difficult to access, use a small flathead screwdriver to depress the locking tab while pulling.
3. 3

   Remove the old brake light switch
   The switch is held by a quarter-turn lock mechanism or rotating collar. Rotate the switch body counterclockwise approximately 30 degrees until it releases from the mounting bracket. Some switches have a release button that must be pressed while rotating. Carefully pull the switch straight out from the bracket, noting the orientation of the plunger for installation reference.
   ⚠Note the position and adjustment of the switch plunger before removal. The plunger length determines brake pedal free play and switch activation point.
4. 4

   Inspect the brake pedal stop pad
   With the switch removed, inspect the rubber or plastic stop pad on the brake pedal arm where the switch plunger makes contact. This pad should be intact and not excessively worn. If the pad is missing or damaged, it must be replaced as it determines proper switch activation. The stop pad presses into a hole on the pedal arm - if replacement needed, pull old pad out and press new pad firmly into place until seated.
5. 5

   Prepare the new brake light switch
   Compare the new switch to the old switch to verify correct part. Check that the plunger on the new switch moves freely and returns when pressed. If the new switch has a locking clip or shipping lock holding the plunger extended, remove it per manufacturer instructions. Some switches are self-adjusting and will automatically set the correct position during installation.
6. 6

   Install the new brake light switch
   Insert the new switch into the mounting bracket with the plunger facing toward the brake pedal stop pad. Align the switch body with the bracket slots and rotate clockwise approximately 30 degrees until it locks into place with an audible click. Verify the switch is fully seated and cannot be pulled out of the bracket. The plunger should be in light contact with the pedal stop pad when the brake pedal is in the released position.
   ⚠Ensure the switch is fully locked in the bracket. A partially installed switch can fall out during operation, causing complete brake light failure.
7. 7

   Reconnect the electrical connector
   Push the electrical connector firmly onto the new switch until the locking tab clicks into place. Gently tug on the connector to verify it is locked and will not pull off. Ensure no wires are pinched between the switch body and surrounding components.
8. 8

   Adjust switch if necessary
   For non-self-adjusting switches: With the brake pedal fully released, the switch plunger should just barely contact the pedal stop pad with minimal pressure. If adjustment is needed, loosen the switch lock ring or adjustment mechanism, move the switch body in or out to achieve proper contact, then retighten. There should be 1-3mm of brake pedal free play before the brake lights activate. Self-adjusting switches will set automatically when the pedal is first pressed.
9. 9

   Test brake light operation
   Turn the ignition to ON position (engine does not need to start). Have an assistant observe the rear brake lights, or position a mirror or phone camera behind the vehicle. Press the brake pedal slowly and verify all three brake lights (two rear, one center high mount) illuminate within the first 5-10mm of pedal travel. Release the pedal and verify all lights turn off completely with no delay.
   ⚠️If brake lights do not illuminate or remain constantly on, DO NOT drive the vehicle. Recheck installation and electrical connection immediately.
10. 10

    Verify shift interlock function
    With vehicle in Park and ignition ON, verify you cannot shift out of Park without pressing the brake pedal. Press the brake pedal and verify the shift lever or shifter button now allows movement out of Park. This confirms the brake-transmission interlock is functioning correctly. On push-button start models, verify the engine will start only when the brake pedal is pressed.

Reassembly

1. Reinstall lower dash panel if removed, ensuring all clips are fully engaged
2. Return driver's seat to normal position
3. Remove all tools and materials from vehicle interior

Verification

• With ignition ON, verify all three brake lights (left, right, and center high mount) illuminate immediately when brake pedal is pressed and turn off completely when released
• Confirm brake lights do not illuminate when pedal is fully released
• Verify cruise control disengages when brake pedal is pressed (if equipped)
• Test shift interlock: confirm transmission will not shift out of Park unless brake pedal is depressed
• On push-button start models, verify engine starts only with brake pedal pressed
• Test drive in safe area to confirm brake lights function normally during actual braking
• If any function does not work correctly, switch may need adjustment or reinstallation - do not drive until all functions verified

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