How does the system work? What triggers the system? What causes/actuates the lightness/stiffness of the steering? Is it gradual or on/off, light/heavy?

Can it be disabled? I want to be able to set it at "normal", disconnecting all electronic assistance. Possible?

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project