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If you're referring to the exterior lights on your van, it's probably the turn signal switch. When I press the brakes, or turn on a turn signal, my rear lights look like a Christmas tree. The brake light wiring has to go through the turn signal switch because of the cruise control, which is why the brake lights are affected by the switch. Mine started with a problem on the right turn signal, and since has completely broken down. Front lights still work fine - it's the back ones that have the problem. When I press the brakes, both my dash indicators for the turn signals light up. I suggest getting a new turn signal combination switch on eBay, as they are around 350 at retail stores.

It would help if you asked a detailed question or described symptoms instead of

being so vague that changing the tire might be the correct answer.

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Q: What would cause the lights on your 99 Chevy Venture to flash?
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