Fail-Safe Chart

FAIL-SAFE FUNCTION

When communication fails in any of the CAN bus lines (communication lines) due to a short circuit or other causes the fail-safe function which is specified for each system, operates to prevent the system from malfunctioning.

Effects on each system when communication is impossible. (For further details, see the pages for each system.)

FAIL-SAFE CHART

Function	ECM	Skid Control ECU	Steering Control ECU	Yaw Rate Sensor	Distance Control ECU	Television Camera ECU	Condition when communication is impossible	DTC detection (Driver detectable)
VSC Control (Controls driving force while VSC is in operation)	x	x	x	x	-	-	VSC function stops	Detectable (Light comes on)
VDM-B control (steering cooperative control)	-	x	x	x	-	-	VDM-B function stops	Can be recognized with abnormal lighting of the light
Dynamic Radar Cruise (Maintains vehicle-tovehicle distance)	x	x	-	-	x	-	Vehicle-to- Vehicle distance control does not operate	Detectable (Light comes on)
Pre-crash safety * AVS control (increases the damping force of the air suspension when the PCS is activated)	-	-	-	-	x	-	Control is inoperative	None
Back Monitor (Exterior view from rear of vehicle is displayed while reversing)	-	-	x	-	-	x	Back monitor only (function stops)	Detectable (recognized when vehicle direction is not displayed
Pre-crash (requests braking and seat belt tightening when a vehicle crash is detected)	-	x	-	-	x	-	Pre-Crash is inoperative	Detectable (Light comes on)
Absorber Control (Controls suspension properly based on vehicle conditions)	x	x	-	-	-	-	Control stops	Detectable (absorber control does not display)
Electric power steering (outputs the assist current)	x	x	x	-	-	-	Control continues with assist force of a vehicle speed of 43.5 mile/h or equivalent	Detectable (Light comes on)
Controls torque distribution to the front and rear wheels	x	x	x	-	-	-	Fixed torque distribution. Front 3: Rear 7	Can be recognized with abnormal lighting of the light
Meter Display (Displays operation condition and DTCs)	x	x	-	-	x	-	light does not come on or remains on	Can be recognized with abnormal lighting of the light
Obstacle position detection (determines the level of contact avoidance based on steering wheel operation)	-	-	x	-	-	-	Informs the driver of an obstacle in the detection ranges	The steering wheel assist mark on the clearance sonar indication blinks
Back monitor detection (there is no back sonar if the vehicle is equipped with the back monitor)	-	-	-	-	-	x	Recognizes the presence of the back sonar by mistake and informs the driver	The back sonar mark on the clearance sonar indicator blinks
VGRS control (controls the ratio of the steering gear based the vehicle speed)	x	-	x	-	-	-	VGRS function stops	Can be recognized with abnormal lighting of the light

FAIL-SAFE CHART

Function	Seat belt control ECU	Absorber control ECU	Network gateway ECU	Power Steering ECU	4WD ECU	Clearance warning ECU	Steering control ECU	Condition when communication is impossible	DTC detection (Driver detectable)
VSC Control (Controls driving force while VSC is in operation)	-	-	-	-	-	-	-	VSC function stops	Detectable (Light comes on)
VDM-B control (steering cooperative control)	-	-	-	x	-	-	x	VDM-B function stops	Can be recognized with abnormal lighting of the light
Dynamic Laser Cruise (Maintains vehicle-tovehicle distance) -	-	-	-	-	-	-	-	Vehicle-to- Vehicle distance control does not operate	Detectable (Light comes on)
Pre-crash safety * AVS control (increases the damping force of the air suspension when the PCS is activated)	-	-	-	-	-	-	-	Control is inoperative	None
Back Monitor (Exterior view from rear of vehicle is displayed while reversing)	-	X	-	-	-	-	-	Back monitor only (function stops)	Detectable (recognized when vehicle direction is not displayed
Pre-crash (requests braking and seat belt tightening when a vehicle crash is detected)	X	-	-	-	-	-	-	Pre-Crash is inoperative	Detectable (Light comes on)
Absorber Control (Controls suspension properly based on vehicle conditions) -	-	X	-	-	-	-	-	Control stops	Detectable (absorber control does not display)
Electric power steering (outputs the assist current)	-	-	-	X	-	-	-	Control continues with assist force of a vehicle speed of 43.5 mile/h or equivalent	Detectable (Light comes on)
Controls torque distribution to the front and rear wheels	-	-	-	-	X	-	-	Fixed torque distribution. Front 3: Rear 7	Can be recognized with abnormal lighting of the light
Meter Display (Displays operation condition and DTCs)	x	x	X	x	x	-	x	light does not come on or remains on	Can be recognized with abnormal lighting of the light
Obstacle position detection (determines the level of contact avoidance based on steering wheel operation)	-	-	-	-	-	X	x	Informs the driver of an obstacle in the detection ranges	The steering wheel assist mark on the clearance sonar indication blinks
Back monitor detection (there is no back sonar if the vehicle is equipped with the back monitor)	-	-	-	-	X	-	Recognizes the presence of the back sonar by mistake and informs the driver	The back sonar mark on the clearance	sonar indicator blinks
VGRS control (controls the ratio of the steering gear based the vehicle speed)	-	-	-	x	-	-	X	VGRS function stops	Can be recognized with abnormal lighting of the light

HINT:

X: Control master
x: System related