April 5, 2026: LEMON Manuals is launched! Read the announcement.

System Description [10/2014 - 09/2017]

ASC SYSTEM

The ASC system uses a stereo component equalizer assembly to electronically generate a driving sound. Simulated engine sounds are output from the No. 1 speaker assembly with box.
The simulated engine sounds are calculated based on the vehicle information (driving mode, shift position and accelerator opening angle). The sounds can be turned on and off and the volume can be adjusted via operation of the vehicle sound switch.

The following 2 types of sounds can be output.

Idling Sound

When the vehicle is stopped or idling, a sound resembling an audible engine sound is output.
When the vehicle is stopped, accelerating at below 10 km/h (6 mph) or decelerating at 8 km/h (5 mph) or less, sound is output.

Fig 1: Idling Sound Graph

GTY508816

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Idling Sound Output Example	*b	Vehicle Speed
*c	Time	*d	When Accelerating
*e	When Decelerating	*f	While Driving
*g	10 km/h (6 mph)	*h	8 km/h (5 mph)
*i	Sound Output	-	-

IDLING SOUND OUTPUT CONDITIONS

Item	Condition	Note
Driving Mode	NORMAL or SPORT mode	The following conditions must be met: NORMAL mode: When the vehicle speed is less than 10 km/h (6 mph), idling sound is output. SPORT mode: While driving at 0.1 km/h (0.1 mph) or after turning the power switch on (READY) with the shift lever in P, when the accelerator pedal is depressed and the engine starts, the idling sound is output.
Shift Position	P, R, N, D, S	-
Vehicle Speed	When accelerating: Below 10 km/h (6 mph) When decelerating: 8 km/h (5 mph) or less	When the vehicle is determined to be driving at the speeds listed, the idling sound is output.

Driving Sound

When the vehicle is being driven, a sound resembling an audible engine sound (including sounds made when shifting gears) is output.
When the vehicle is accelerating at 10 km/h (6 mph) or more or decelerating at 8 km/h (5 mph) or more, sound is output.

Fig 2: Driving Sound Graph

GTY497673

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*a	Driving Sound Output Example	*b	Vehicle Speed
*c	Time	*d	When Accelerating
*e	When Decelerating	*f	While Driving
*g	10 km/h (6 mph)	*h	8 km/h (5 mph)
*i	Sounds Output	-	-

DRIVING SOUND OUTPUT CONDITIONS

Item	Condition	Note
Driving Mode	NORMAL or SPORT mode	-
Shift Position	R, D, S	-
Vehicle Speed	When accelerating: 10 km/h (6 mph) or more When decelerating: 8 km/h (5 mph) or more	When the vehicle is determined to be driving at the speeds listed, the driving sound is output.