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lights on 2003 Buick Regal

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Backup light come on when lights are on?
Trunk open when i release the park brake with the ignition on.
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Any more to the story? Some possibly helpful details are missing?
one rain night i went out start the car turn on the light and the backup lights came on and since then when the light(park/head) come on the backup lights are on.
Hopefully one of the other guys with GM experience will reply. I think you might have a bad 'gear selector switch , or possibly damaged wire(s). I think on that , it might be located on the trans , but I couldn't tell you exactly where.