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Sounds like a faulty switch. Not much else would be involved.
The switch gets power from the same source in both positions.
The only thing that comes to mind is a faulty switch or a weak connection at the battery. It could be pulling more current in the on position which would cause a weak connection to fail.
But I would bet on the switch first.
This vehicle has problems with the multifunction switch AND the hazard light switch. Try turning the switch on and move the hazard light switch back and forth up and down. If that's not it, I'd look at replacing the MFS. There is a TSB on the MFS, but typically for the brake lights not working. Look in this to go over the steps to take to diagnose also.
If it just clicks when trying to start then its the batt even though it turns everything on may be to weak to start your car, if it cranks but won't turn over could be a number of things . Check all fuses that the car has, check to see of your fuel pump is kicking on have a friend listen by the gas tank for a buzzing or whining noise as you turn the car to on. My car crank but no start was the pcm fuse.. Could be the fuel pump fuse like I said check everything you can. If the car is just clicking try hooking up for a jump start but make sure you take all safety steps first.. Good luck.. .
My 1999 Buick Regal GS was doing the exact same thing. Replaced the ignition switch on the steering column and everything worked fine. You can buy one online for around $85. Installation took me a couple of hours.