1. Check the Brake Pedal Switch:
* Location: This switch is usually located on the brake pedal assembly itself. You'll likely need to look under the dash, near the brake pedal.
* How to Check: With the car OFF, gently press and release the brake pedal several times. See if the brake lights go on and off with the pedal movement. If they do, the switch is likely faulty and needs replacing. If they remain on, the problem is elsewhere.
2. Check the Brake Light Bulbs:
* While this might seem obvious, a shorted bulb can sometimes cause the issue. Check all three bulbs (two on the rear and one on the center high-mounted stop lamp/CHMSL, also known as the third brake light). Replace any bulbs that are burned out or visibly damaged.
3. Inspect the Wiring and Connectors:
* Location: Trace the wiring harness from the brake lights back towards the brake pedal switch. Look for any frayed, pinched, melted, or corroded wires. Pay close attention to the connectors – make sure they're securely plugged in and clean.
* What to look for: Loose connections are a common culprit. A short-circuit can cause the lights to stay on even when the switch is off.
4. Fuse Check:
* Location: Consult your owner's manual to find the fuse box diagram and locate the fuse(s) related to the brake lights.
* How to Check: Carefully remove the fuses and visually inspect them for blown filaments. If you find a blown fuse, replace it with one of the same amperage rating. However, if the new fuse immediately blows again, you have a short-circuit somewhere in the wiring and should NOT continue troubleshooting further without professional help.
5. Body Control Module (BCM):
* In some cases, a malfunctioning BCM can cause this issue. This is a more advanced problem, requiring diagnostics tools that most people don't have.
6. Brake Light Switch Connector:
* Carefully inspect the connector for the brake pedal switch. Make sure the pins aren't bent or corroded and that the connector is properly seated.
Important Considerations:
* Safety First: Driving with brake lights always on is dangerous. If you can't safely determine the cause, avoid driving the vehicle until it's fixed.
* Professional Help: If you're not comfortable working with car electrical systems, it's best to take your Chrysler Cirrus to a qualified mechanic for diagnosis and repair. They have the tools and expertise to properly troubleshoot the problem.
By following these steps, you should be able to isolate the cause of your persistent brake lights. Remember to always consult your owner's manual for specific details about your vehicle's fuse box and wiring diagrams.
