Some Toyota Tundra owners report experiencing issues with brake lights that remain on, often due to a faulty brake light switch, which is the most common cause. If the brake light switch is functioning properly, owners may need to inspect the wiring harness connecting the switch to the bulbs, as faulty wiring can also keep the lights illuminated. Additionally, a failing parking brake switch can contribute to the problem, and jiggling the handle may help identify this issue. Other potential causes include malfunctioning brake pedals and ground wire issues that affect the brake lights. It is crucial to address these problems promptly to ensure safety and prevent battery drainage, and owners are advised to consult a professional mechanic or visit a Toyota service center if they are unsure about diagnosing or fixing the issue.
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