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10th generation of Chevrolet's full sized SUV, based on the GM GT900 platform.

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Brake light issue 09 Suburban

I have a 2009 Suburban. I noticed the passenger brake light not working so I changed the bulb but in the process, noticed the brake lights didn’t work with the truck off. I put the key in the ignition and turned it over, then the brake lights worked. What could be the issue causing them to not work unless the truck is on?

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Brake lights on some vehicles just do not work with the ignition off. I believe this is a feature to save the battery in case there is a fault in the brake system, but I do not know. My car’s brake lights do not turn on when I have the key off either.

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