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Post #1
 24th October 2014 - 04:15 PM
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Hey guys i need a hand with figuring out what the problem is.. I have a subaru liberty 1997... there seams to be a problem with the key entry system.. 1. when i try to open the door with the car door remote it will not unlock. 2. if i push the car door remote it will enable the immobalizer so the car is drivable. 3. if i lock the door manually from the drivers side then all other doors will lock.. 4. the remote only has one button with controls the immobalizer and the central locking. does anyone know what the problem would be and what i need to do.. cant find anything on youtube.. |
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Shuffs
Post #4
I suppose your spare key is sadly lacking in remote buttons as well, so you can't check one against the other.The transponder is just a chip that sits in the key case, that's why you can have a key with no remote buttons but will still start the engine, which it appears that your current key is doing |
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cleverliving
Post #5
unfortunatly i dont have a spare key unfortunately.. however there is one key button on the remote and it enables the immobalize as well as unlocks the doors when operating correctly. |
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Shuffs
Post #6
Here is some info explaining how the immobiliser in your key works QUOTE A transponder chip disarms a vehicle immobiliser when the car key is used to start the engine. The majority of keys to cars built after 1995 contain transponder chips. A transponder is short for: transmitter + responder. The word came into use around 1944. In basic terms a transponder is a miniaturized electronic chip that has what is called non-volatile memory. Non-volatile memory is the type of memory that does not need constant energy for retention. Along with that electronic chip is a set of windings; very fine wire coiled around a tube. These windings look similar to the windings you would find in an electric motor. There are two basic types of transponders. The first are the electric coupled transponder systems. Electric coupled transponder systems are not limited to small areas for transmission but can transmit messages or signals for different ranges of distance including several inches to miles, as used in satellites and airplanes. These systems require large amounts of constant electricity to operate. The second type is what automobile manufacturers are using and they are called magnetic coupled transponder systems. Magnetic coupled transponder systems are passive in nature. This means they do not require constant electricity and thus do not need a power source of their own. They operate in the frequency range area of 125 kHz. Since magnetic coupled transponders do not have their own power source they are very limited in range of communication and generally operate in the range of 1 cm to 15 cm. Since this is a radio frequency it can penetrate materials that would make the transponder not directly visible, such as the plastic or rubber in the bow of a key. The process of key identification is similar in most automotive transponder systems. Once a key is inserted into the ignition lock and turned to one of the ‘on’ or ‘run’ positions, the induction coil that is mounted around the ignition lock sends out an electromagnet field of energy. The windings in the transponder chip absorb that energy and power the electronic chip to emit a signal. The signal is usually an alphanumeric sequence which is considered the identification code. The induction coil reads the signal and sends it to some type of computer device to recognize the signal. If the signal is recognized as being already in the computer’s memory the signal is accepted and other electronic components in the vehicle are set into motion to allow the starting of the vehicle or the continuation of the engine running. Immobiliser systems based on Transponders may not be as safe as they are considered to be. Some immobiliser systems tend to remember last key code for so long that they may even accept a non-transponder key even after a few minutes of taking out the original key from ignition. The button on your key is purely to operate the central locking for the doors,and it would appear your main problem is,for whatever reason,is not functioning,you could actually remove the battery,and the key would still work as it is now,manually opening the doors,plus starting the engine.All I can suggest is make sure you have inserted the correct battery,the right way,and if it still won't conform,at least you can still operate your vehicle,until you decide your next plan of attack,just without remote unlocking. |
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cleverliving
Post #7
thanks for the info but i took the battery out and the i can not activate the immobalizer if the batter is not inside the remote? |
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Shuffs
Post #8
QUOTE (cleverliving @ Oct 26 2014, 07:36 PM)  thanks for the info but i took the battery out and the i can not activate the immobalizer if the batter is not inside the remote? Not sure if you're asking me,or telling me,but the point I've been trying to make,is the immobiliser does not need power to operate,Read the quoted part again,the Transponder is the part of the key that activates,and deactivates the immobiliser,and does NOT need power to do this,it just picks up a magnetic signal that comes from the steering column QUOTE The second type is what automobile manufacturers are using and they are called magnetic coupled transponder systems. Magnetic coupled transponder systems are passive in nature. This means they do not require constant electricity and thus do not need a power source of their own. They operate in the frequency range area of 125 kHz. Since magnetic coupled transponders do not have their own power source they are very limited in range of communication and generally operate in the range of 1 cm to 15 cm. Since this is a radio frequency it can penetrate materials that would make the transponder not directly visible, such as the plastic or rubber in the bow of a key. The process of key identification is similar in most automotive transponder systems. Once a key is inserted into the ignition lock and turned to one of the ‘on’ or ‘run’ positions, the induction coil that is mounted around the ignition lock sends out an electromagnet field of energy. The windings in the transponder chip absorb that energy and power the electronic chip to emit a signal. The signal is usually an alphanumeric sequence which is considered the identification code. The induction coil reads the signal and sends it to some type of computer device to recognize the signal. If the signal is recognized as being already in the computer’s memory the signal is accepted and other electronic components in the vehicle are set into motion to allow the starting of the vehicle or the continuation of the engine running. So it WILL still start the car,and it will open the door,if you use the key in the door lock,but you just need a battery in the key to UNLOCK the doors with the button on the key from a distance (REMOTELY) |
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cleverliving
Post #9
yes it will start the car |
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Shuffs
Post #10
QUOTE (cleverliving @ Oct 27 2014, 10:08 AM) yes it will start the car yes it can open all doors when using a key in the door NO it will not open the doors form a distance remotely This has been a bit like pulling teeth  If you have replaced the battery with the exact same replacement,and haven't put it in back to front,then you may have a 'dry joint' on the key's circuit board,(this could be confirmed by taking it out of the key body,fitting the battery,and pressing the button without the key cover on)If you buy a new key,it will have to be programmed to the cars computer to work,so do it through a Subaru Dealer,meantime just use your current key,and open the doors manually.....Oh and don't loose it! |
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cleverliving
Post #11
hmm i may end up going to a dealership and asking them if they can solve it.. |
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