1. Check the Brake Pedal:
* Is the brake pedal all the way down? Sometimes, the pedal might not be fully returning, keeping the brake lights illuminated. Try pumping the brake pedal a few times to see if it resolves the issue. If this works, investigate why the pedal isn't returning fully – this could be a problem with the brake booster, master cylinder, or a sticking caliper.
2. Inspect the Bulbs:
* Turn on the ignition (but don't start the car). Have someone press the brake pedal while you check the brake lights and the center high-mounted stop lamp (CHMSL, or third brake light).
* Look for burned-out bulbs. If a bulb is burned out, it's possible the filament is shorted, causing the light to stay on. Replace any faulty bulbs with the correct wattage.
3. Check the Brake Light Switch:
* Location: This switch is usually located on the brake pedal assembly. It's a small switch that's activated when the brake pedal is pressed.
* Visual Inspection: Look for any obvious damage or loose connections.
* Testing (requires multimeter): With the ignition off, disconnect the brake light switch connector. Use a multimeter to check for continuity between the two terminals of the connector when the brake pedal is pressed and released. If there is continuity when the pedal is *not* pressed, the switch is faulty. If you don't have a multimeter, you can try bypassing the switch (carefully!) by connecting the wires temporarily to see if it turns the brake lights off. Be cautious when bypassing electrical components. Disconnect the negative battery cable first. If the brake lights go out, it's highly likely the switch is at fault.
4. Inspect Wiring:
* Look for frayed, damaged, or corroded wires in the brake light circuit, particularly near the brake pedal and taillight assemblies. Repair or replace any damaged wiring.
5. Check the Brake Light Fuse:
* Consult your owner's manual to locate the fuse box and identify the fuse for the brake lights. Check if the fuse is blown. Replace it with a fuse of the same amperage if necessary.
6. Inspect the BCM (Body Control Module):
* This is the most complex option. The BCM controls many electrical functions in the car, including the brake lights. A malfunctioning BCM could cause the lights to stay on. This requires a diagnostic scan tool or professional help to diagnose.
Important Safety Note: Driving with brake lights constantly on is dangerous. It could drain your battery and lead to other electrical problems. If you can't identify and fix the problem, take your vehicle to a qualified mechanic.
