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Car battery dead, key fob won't unlock. What to do?

Ignition key will not unlock door, can't open car hood.

Posted by Anonymous on

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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Doktir
  • 55 Answers

SOURCE: key fob remote start issues

You need to get one that works on the same wide range frequency as the reciever in the car, and then it's a simple matter of opening both the new and old fobs, and matching the fine frequency settings by putting the little switches inside where they should be according to the old fob's switches. If there are no switches in the old fob, it's preset and there's not much you can do about it.

Posted on Mar 09, 2009

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  • 14036 Answers

SOURCE: My battery is dead. The doors are locked so the

where are your ignition key.most of the time the ignition key opens the car if the remote stop working ..if your keys lock inside. vechicle .you got to call a lock smith.or go to dealership give them your car serial number.

Posted on May 16, 2009

larrymatthew
  • 318 Answers

SOURCE: 1991 Chevy Lumina. Car

The key should work even if there is no battery in vehicle. Have you tried both doors (or all doors with locks) Do you live where the temp is below freezing - could be frozen shut or locks frozen?

Posted on Dec 01, 2010

ZJLimited
  • 17970 Answers

SOURCE: 2005 cobalt ls, 24000 mi,

Most commonly if this is a bad receiver, when receiver start going bad they will work and not worked intermittently. The most you can do at this point is try to reprogram the system and see if it begins to work properly again otherwise it's gonna be time to replace the receiver. Part of the receiver is working, see the receiver receives your signal but then it must perform an action and it's the action part of the receiver that has the problem.

If the reprogramming must be done at the dealer with a factory scanner, unfortunately the other scanners available will not do this.

Keep in mind that the best place to possibly get a replacement key fob would be from the dealership. They will be able to sell you the fob and program it to your vehicle for you as well. Also if you need any extra keys you can get them there as well.

Hope this helps. Keep us updated.

Posted on May 04, 2011

  • 1267 Answers

SOURCE: Windows won't go up our down power door locks

It may be as simple as reprogramming your system. There is a way to re-synch your keys to the system. Use the instructions at:
http://www.programyourremote.com/classified/DisplayAd.asp?id=334

That vehicle had a lot of problems with the PCM "Power Control Module" and that may be your problem.

Posted on Jun 11, 2011

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There is a special procedure involved in keying your fob to your car once the battery has been changed. You must lock and open the door with your key. Turn the ignition to "on"(not start) then push the fob's open and close button, then shut off ignition. This procedure is done everything the key battery is changed. Hope this can help you!
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I had the same problem yesterday. I removed the battery (that was near dead) to take to get tested, but I had locked the doors and closed the hood before leaving. When I got back with the new battery the key fob wouldn't work, and the key would not manually open the doors. I ended up having a mechanic friend reach up under the front of the car to manually release the hood (it took him about 20 minutes to figure it out), replaced the battery, and then the key fob worked again. I'm not sure why the keys wouldn't work in the door - any ideas there?

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If the passkey is messed up, there will be a light on the dash that says security, or have a picture of a car with a lock thru it. If there is no light when the key is turned forward, then its NOT a passkey problem.



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Aug 17, 2011 | 2003 Chevrolet Monte Carlo

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Won't open my door when I press unlock, key won't open door either


can you manually unlock the lock and open the door?? Is it more than one door or just one specific door? If its just one door, yourcactuator inside the door may be bad or you have a wire issue. If its all the doors, more than likely you blew a fuse or a relay(id say fuse)

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1999 porsche 996 replaced key fob battery disconnected battery now trunk releses are locked and cant access battery.How do you open frt trunk manually


Assuming the car battery is ok (if not, buy a male to male cigarette lighter at the auto store and connect to another car until charged enough to unlock the doors...but don't try to crank the ignition!). The trunks won't open if the battery went dead with the alarm set because arming the alarm physically locks the releases.

Sounds like the key code is switched off because you replaced the key fob battery. Try unlocking the car manual with the key in the door lock. Then switch the ignition on to reactive the keyless entry. If this does not work, you might also try pressing the fob unlock button with the key in the door lock until the dash led flashes.

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