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could be the ignition control module or the ignition switch its self
no not always only if its not working at all
To test, use a voltmeter to check for power at the control module with the ignition on. If there is power, crank the engine and check for a pulsating ground at the module. This pulsating ground is a signal from the car's computer. If there is no signal, the problem is with the computer or a sensor.