Brake Light Switch

Replace the brake light switch located on the brake pedal assembly, which activates the rear brake lights when the pedal is depressed.

Warnings

Tools required

Parts

• Brake light switch × 1 — Use OEM specification

Preparation

1. Park vehicle on level surface and engage parking brake
2. Disconnect negative battery cable to prevent short circuits while working with electrical connections
3. Allow vehicle interior to cool if parked in sun—pedal area can retain significant heat
4. Position work light to illuminate brake pedal bracket area in driver footwell
5. Adjust driver seat fully rearward to maximize footwell access

Procedure

1. 1

   Locate brake light switch
   Position yourself in the driver footwell with adequate lighting. Locate the brake light switch mounted on the brake pedal support bracket near the top of the pedal arm. The switch will have a plunger that contacts the pedal arm or a bracket tab when the pedal is in the rest position. Trace the wiring harness from the switch to identify the electrical connector location.
2. 2

   Disconnect switch electrical connector
   Locate the electrical connector attached to the brake light switch. Press the locking tab on the connector and pull firmly to separate it from the switch. The connector may be tight due to age—use a small flat-blade screwdriver to carefully release the locking tab if necessary. Allow the connector to hang freely; it will not reach the floor.
3. 3

   Remove brake light switch
   The switch is retained either by a threaded bushing that screws into the bracket, or by a push-in retainer clip. If threaded: rotate the switch body counterclockwise to unthread it from the mounting bracket. If clip-retained: locate the retaining clip on the switch body, compress or release it as designed, and pull the switch straight out from the bracket. Note the orientation of the switch plunger relative to the pedal arm for installation reference.
4. 4

   Inspect mounting bracket and pedal contact point
   With the switch removed, inspect the mounting bracket threads (if threaded type) for damage or corrosion. Check the pedal arm or bracket tab that contacts the switch plunger for wear, deformation, or debris buildup. Clean any dirt or corrosion from the mounting area with a shop towel. Verify that the pedal returns fully to its rest position without binding.
5. 5

   Install new brake light switch
   Position the new brake light switch at the mounting bracket in the same orientation as the original. If threaded: thread the switch clockwise into the bracket until it bottoms gently, then back it out until the plunger just contacts the pedal arm or bracket tab with the pedal at rest—typically 1/4 to 1/2 turn. If clip-retained: push the switch firmly into the bracket until the retaining clip engages with an audible click. The plunger should contact the pedal arm or bracket tab when the pedal is in the full rest position.
   ⚠Improper switch adjustment will cause brake lights to remain on continuously (draining battery) or fail to illuminate when braking. The switch must activate when pedal is released and deactivate when pedal is depressed approximately 1/4 to 1/2 inch.
6. 6

   Connect electrical connector
   Align the electrical connector with the terminals on the new brake light switch. Push the connector firmly onto the switch until the locking tab engages with an audible click. Gently tug on the connector to verify it is fully seated and locked.
7. 7

   Reconnect battery and test brake lights
   Reconnect the negative battery cable. Turn the ignition to the ON position (engine does not need to run). Have an assistant observe the rear brake lights, or use a mirror/mobile phone camera to view them yourself. Press the brake pedal—brake lights should illuminate immediately. Release the pedal—brake lights should extinguish completely. Repeat several times to confirm consistent operation. If lights remain on with pedal released, the switch needs adjustment (back out 1/8 turn if threaded) or reseating (if clip type).
   ⚠️DO NOT return vehicle to service until brake light operation is confirmed. Verify lights illuminate with pedal application and extinguish completely with pedal release. Test with ignition ON and engine running.

Reassembly

1. Return driver seat to normal operating position
2. Verify brake pedal returns fully to rest position without interference from switch or wiring

Verification

• With ignition ON, verify brake lights illuminate immediately when brake pedal is pressed and extinguish completely when released
• Test brake lights with engine running to confirm operation under normal driving conditions
• Check that brake lights do not remain illuminated with pedal at rest—continuous illumination indicates misadjusted or defective switch
• Verify cruise control disengages when brake pedal is pressed (cruise control shares the brake switch signal on this platform)
• Test that transmission will shift out of Park with brake pedal depressed if vehicle has automatic transmission (some interlock systems use brake switch signal)

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