1999 Lexus GS 400 Owners Manual - Page 320

STARTING AND DRIVING When the difference between the actual vehicle speed and the set speed is less than 5 km/h (3 mph), the set speed can be lowered 1.6 km/h (1 mph) each time by pressing the control lever downward in the "SET/COAST" direction quickly within 0.6 seconds. However, a quicker way to reset is to depress the brake pedal and then press the control lever downward in the "SET/COAST" direction. Even if you downshift the transmission from the "D" position to "4" with the cruise control on, engine braking will not be applied because the cruise control is not cancelled. To decrease the vehicle speed, reset to a slower speed with the cruise control lever or depress the brake pedal. If you use the brake pedal, cruise control is cancelled. control system. Contact your Lexus dealer. Resuming the preset speed If the preset speed is cancelled by pulling the control lever or by depressing the brake pedal, pushing the lever up in the "RES/ACC" direction will restore the speed set prior to cancellation. However, once the vehicle speed falls below about 40 km/h (25 mph), the preset speed will not be resumed. Cruise control failure warning If the "CRUISE" indicator light in the instrument cluster flashes five times and then goes out when using the cruise control, it means that there is trouble in the cruise 300