Mine works fine but I will throw a guess out there. I would consider the safety features that would disable it, such as the brake pedal. I don't know if it looks at the brake switch or a brake pressure switch. There is no cruise actuator so that can't be the problem. Other than that it could be the lever/switch itself but I think that is unlikely.

Just my .02.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra