I have a 2007 Pontiac G5 the car will just shut down all security lights start flashing car will not start everything clicking in the car from the security system. How do I reset

SOURCE: 2007 yukon xl battery dead recharged battery will

We had the same issue with our 2007 Yukon Denali XL. Died on us twice after sitting for short periods of time; once we watched a DVD with the engine off and battery died within 10 minutes. The dealership kept it overnight to troubleshoot why the battery died so quickly. They said the radio was "pulling" too much from the battery. (They supposably fixed it) But again a few days later the battery died again after sitting overnight. We brought it back to the dealership and they brought in a GMC "expert" to replace the entire DVD/CD/Navigation system. They also replaced our battery with a much larger battery, similar to the ones that GMC puts in there diesel trucks. They had our Denali for 5 days, but it appears to be fixed now.
Getting it fixed correctly wasn't without headaches, but it was all covered under warranty, including the battery. And they are updating the nav w/ the new edition disc as well for no charge.

SOURCE: security light blinks on dash , truck wont even try to start

Does your key have a chip on it? If it does its probably the problem

SOURCE: Have a 2007 Pontiac G5 and need to add power steering fluid.

its tricky. its behind the engine. If you pop the hood and you go to the left side, look behind the block and it chould be about half way down or so. You should see the cap for it. I think that was a horrible idea on pontiacs part. Happy motoring!

SOURCE: how do you reset oil change indicator

Turn the key to the "on" position with the engine "off". Then step on the gas pedal to the floor 3 times.

SOURCE: Possible security light problem on 1999 pontiac firebird...

if you have the chip in the key, then this will surely help you: http://newrockies.com/vatsbypass . It was the only thing that saved my car.