Date registered: May 2013
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There are 4 electronic and/or mechanical modules that are synchronized for everything to work ok: 1. The key (electronic key); 2. The electronic ignition switch (eis, the place where you put your key in); 3. steering locker; 4 the central electronic circuit module.
If only one of them has a problem, the key will refuse to turn.
The first step is to check all the fuses are ok, if not replace all the burned with new and check if the problem persists.
Next step is to check connectors, and cables (not an easy task for non experts. Special tools are required like a multimeter; 12volt indicator; screwdrivers to remove covers; etc),
You need to assure that all the above modules are supplied with a +12volt line that is usually the first pin in each connector. Connect a the black wire from voltmeter to car's chassis that is the ground (-) and check with the red wire of the voltmeter to every pin of every connector. If casually there is a connector that has no +12v pin then it might be the problem; try to find out where the +12v should be and create a fused (5-15 ampere) bridge and connect it to where it should be. Check again if the problem is solved otherwise you need to check each of the modules separately to a specialist,
Each of the modules ca be reset and it might solve the problem otherwise you will have to purchase the defective module.
Their price is relatively high, starting with the fob key that is the cheapest and ending with the central electronic circuit that is the most expensive.