Obviously you must have a good battery and clean battery terminals. And it only operates the starter relay after it’s satisfied that the correct key is in the ignition. The second relay, the more important of the two, is controlled by the powertrain control module (PCM). The ignition switch now talks to the body control module (BCM) and it’s the BCM that initiates one of two relays. In the old days, power flowed through the ignition switch and down to the starter solenoid. But a no start, no crank, no click condition can be far more involved than that. If you have a late model GM vehicle and turn the key only to hear nothing, you’ll most likely think you have a dead battery-and you may. Make and Model > Saab > 9-7X > no start no crank no click – GM no start no crank no click – GM How to diagnose a no start no click on GM vehicle.
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