Question about 2005 Chevrolet Cobalt

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I have a 2005 cobalt every time I open the doors the alarm goes off I replaced the battery in keyless entry but they do not work can anyone help?

I replaced the battery in keyless entry but they do not work

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I found this after doing a google search for re-syncing a 2005 chevy cobalt. Don't know if it really works but it was the #1 answer:
The Fix.

I pulled the interior fuse cover from the passenger seat.
I located and pulled the 10A fuse for the Radio (labeled RDO).
I turned the car to the on position to verify the radio was disabled.
I turned the car back off and removed the keys.
I waited 30 seconds (I'm a Network Engineer, we always wait thirty seconds after unplugging something).
I put the fuse back into the correct spot.
I then held down the lock and unlock key on the keyfob at the same time till the locks on the doors activated.
I then tested the keyfob and made sure it was locking and unlocking the doors and activating the security system.
This process did reset my security settings on her car so I had to go through the reset process (holding in the information and reset key at the same time then following the prompts).

The keyfob now works, and I didn't have to pay some ******* dealer $50 for 15 seconds.

Posted on Jun 21, 2015

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You may have accidentally broke the controller. They are fragile. The newer cars like yours automatically set the alarm when the doors are locked from keychain remote, or locking manually. New remote, $50-100.

Posted on Jan 03, 2015

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