2004 Subaru Impreza Owner's Manual - Page 151

Instruments and controls gine-speed warnings are given by both the REV indicator light and the buzzer. " Turn the knob counterclockwise (−) to disable the buzzer. The indicator will show and the buzzer will not sound. With the buzzer disabled, enginespeed warnings are given only by the REV indicator light. Approximately three seconds after you stop turning the knob, the buzzer will sound once to indicate the end of the setting procedure. The indicator will return to showing the ambient temperature. Also, the tachometer needle will return to approximately "0". ! Deactivating the REV alarm system To deactivate the REV alarm system's REV indicator light and buzzer functions, set the alarm-level engine speed to 0 (zero) rpm. NOTE " The REV alarm system does not operate while settings are being entered. " The speed-setting mode terminates if 0 rpm is selected. " The speed-setting mode is canceled if the ignition switch is turned to OFF or the vehicle starts moving before the setting procedure is finished. " Speed setting is impossible when the vehicle is moving. " The set engine speed may differ from the engine speed shown by the tachometer. Use the engine speed shown by the tachometer as a rough guide. 3-14