If S-Mode faults, and cruise control doesnt work, its going to be the top clutch pedal switch. The cruise would have been non-functional for a while, you just might not notice it. If the top switch is not making fully closed contact than the vehicle controls are unable to tell when you are on/off the clutch pedal, so of course cruise and S-Mode could not work.
The top switch is not to be confused with the bottom switch, which is used to allow the engine starter to engage.
Top switch adjustment might be needed after doing clutch related work. It will also often need adjusting after installing and even after changing adjustment to the RJM adjustable pedal.
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