Question about 2007 Hyundai Sonata 2.0

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2007 sonota can't start car after unlocking with key

Key fob not working even with new battery. can't unlock car with key without sounding the alarm. can't start the car

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 2003 hyundai santa fe car alarm

I had the same problem a while back. What I did was disconnect the battery for a minute and I havent had that problem since.

Posted on Feb 14, 2009

tbirdfan1
  • 3051 Answers

SOURCE: key fob will not lock or unlock doors on 06 Sonata

Hi there
i have the same problem but mine is the sensor that is under the dash that is faulty so i had them disable it untill i can get a part that they need to order so i would have your dealer check the sensor .. if it is under warranty they will replace it for free

Posted on Mar 08, 2009

ghost45
  • 1280 Answers

SOURCE: electronic lock/unlock not working

Apparently the "LOCK" function is working normally because the burglar alarm is being activated when you 'lock' the car. Is this right?
The fact the engine won't start when the burglar alarm is activated is NORMAL If the doors will not UNLOCK front the driver's door manual switch, I believe you have a bad DOOR UNLOCK relay in the control module.






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Posted on Sep 07, 2009

  • 1 Answer

SOURCE: both fobs won't work, i

Put the key in and turn to the "ON" position and leave it there for 30 seconds. Then turn the key further to start the car. The alarm will then be disabled and the engine will be running. You have to then go to a dealership to get the fobs working again.

Posted on Nov 09, 2009

  • 510 Answers

SOURCE: hyundai santa fe key fob 1 works 1 does not have

System operation
Pressing remote control lock button locks vehicle and activates system Fig. 1 . Indicators flash once. Pressing remote control unlock button unlocks vehicle and deactivates system Fig. 1 . Indicators flash twice.
Fig. 1
Synchronization
When
System malfunction. Remote control added or replaced.
How
Access alarm system control module located under driver's side lower fascia Fig. 2 . Set memory switch to SET position. Press remote control lock or unlock button. Set memory switch to OFF position. Confirm synchronization has been successful by locking and unlocking vehicle. Repeat procedure for second remote control. Synchronization can also be carried out using diagnostic equipment.
NOTE: A maximum of 2 remote controls can be programmed. NOTE: If remote control fails, system can be deactivated as detailed in the owner's handbook.

Posted on Jul 30, 2010

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Key fob won't work even after changing battery, can only open and lock car using key, alarm won't shut off and keeps ringing


retry replacing battery new doesnt mean cant be defective if it is good than fob needs a relearn different cars have different relearn that you can perform but if the fob has other features such as start that will have to be done at dealer ----
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Ford sold a Ford branded alarm through the parts department. These sometimes were a dealer installed option on new cars. Mine would randomly stop responding to the remote and I would have the same symptoms as you describe. I had it removed and the original equipment factory system still worked. Be warned, if you have the Ford "accessory" alarm, your key fobs (remotes) are different and the method to program them is different from what you will read online. You can tell if you have the system by looking at your key fob. The standard Mustang key fob is a 4 button (lock, unlock, panic, and trunk). The accessory alarm uses a 3 button remote and clicking unlock twice would pop the trunk. I really wish I had a picture of the remote because there are 3 button Ford key fobs for cars without a trunk release although I don't think you should have one on a Mustang. Long story short, if you have the accessory alarm, you can solve your problem by having it removed but you will need new 4 button key fobs to remotely lock/unlock your doors

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