CAN COMMUNICATION SYSTEM > FAIL-SAFE CHART

for Preparation Click here

1. 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.
   

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

   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)	○	●	○	○	-	-	VSC function stops	Detectable (Light comes on)
   VDIM control (steering cooperative control)	-	●	○	○	-	-	VDIM function stops	Can be recognized with abnormal lighting of the light
   Dynamic Radar Cruise (Maintains vehicle-to- vehicle distance)	○	○	-	-	●	-	Vehicle-to- Vehicle distance control does not operate	Detectable (Light comes on)
   Pre-collision safety system * AVS control (increases the damping force of the air suspensions when the PCS is activated)	-	-	-	-	○	-	Control is inoperative	None
   Parking assist monitor system (exterior view from rear of vehicle while reversing)	-	-	○	-	-	●	Parking assist monitor system (function stops)	Detectable (recognized when vehicle direction is not displayed)
   Pre-collision safety system (requests braking and seat belt tightening when a vehicle crash is detected)	-	○	-	-	○	-	Pre-collision safety system is inoperative	Detectable (Light comes on)
   Absorber Control (Controls suspension properly based on vehicle conditions)	○	○	-	-	-	-	Control stops	Detectable (absorber control is not displayed)
   Power steering (outputs the assist current)	○	○	○	-	-	-	Control continues with assist force for a vehicle speed of 43.5mile/h(100 km/h) or equivalent	Detectable (Light comes on)
   Meter Display (displays operation condition and DTCs)	○	○	-	-	○	-	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)	-	-	○	-	-	-	Informs the driver of an obstacle in the detection ranges	The steering wheel assist mark on the clearance sonar indication blinks
   Parking assist monitor system detection (there is no ultrasonic sensor if the vehicle is equipped with the rear view monitor )	-	-	-	-	-	○	Recognizes the presence of the ultrasonic sensor by mistake and informs the driver	The ultrasonic sensor mark on the parking assist-sensor indicator blinks
   VGRS control (controls the ratio of the steering gear based on the vehicle speed)	○	-	○	-	-	-	VGRS function stops	Can be recognized with abnormal lighting of the light

   
   

   Function	Seat belt control ECU	Absorber control ECU	Network gateway ECU	Power steering 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)
   VDIM control (steering cooperative control)	-	-	-	○	-	○	VDIM function stops	Can be recognized with abnormal lighting of the light
   Dynamic radar Cruise (maintains vehicle-to- vehicle distance)	-	-	-	-	-	-	Vehicle-to- vehicle distance control does not operate	Detectable (Light comes on)
   Pre-collision safety system * AVS control (increases the damping force of the air suspensions when the PCS is activated)	-	●	-	-	-	-	Control is inoperative	None
   Parking assist monitor system (displays exterior view from rear of vehicle while reversing)	-	-	-	-	-	-	Parking assist monitor system only (function stops)	Detectable (recognized when vehicle direction is not displayed
   Pre-collision safety system (requests braking and seat belt tightening when a vehicle crash is detected)	●	-	-	-	-	-	Pre-collision safety system is inoperative	Detectable (Light comes on)
   Absorber Control (controls suspension properly based on vehicle conditions)	-	●	-	-	-	-	Control stops	Detectable (absorber control is not displayed)
   power steering (outputs the assist current)	-	-	-	●	-	-	Control continues with assist force for a vehicle speed of 43.5 mile/h(100 km/h)or equivalent	Detectable (Light comes on)
   Meter Display (displays operation condition and DTCs)	○	○	●	○	-	○	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)	-	-	-	-	●	○	Informs the driver of an obstacle in the detection ranges	The steering wheel assist mark on the clearance sonar indication blinkes
   Parking assist monitor system or detection (there is no back sonar if the vehicle is equipped with the back monitor)	-	-	-	-	●	-	Recognizes the presence of the ultrasonic sensor by mistake and informs the driver	The ultrasonic sensor mark on the parking assist-sensor indicator blinks
   VGRS control (controls the ratio of the steering gear based on the vehicle speed)	-	-	-	○	-	●	VGRS function stops	Can be recognized with abnormal lighting of the light

   HINT:

   1. ●: Control master
      
   1. ○: System related