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. You need to assure that all the above modules are supplied with a +12volt line that is usually the first pin in each connector.
Special tools are required like a multimeter 12volt indicator screwdrivers to remove covers etc), Next step is to check connectors, and cables (not an easy task for non experts. 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. If only one of them has a problem, the key will refuse to turn. steering locker 4 the central electronic circuit module. The electronic ignition switch (eis, the place where you put your key in) 3. There are 4 electronic and/or mechanical modules that are synchronized for everything to work ok: 1.
