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 Sensor	Yaw Rate Sensor	Distance Control ECU	Television Camera ECU	Suspension Control ECU	Gateway ECU	Seat Belt Control ECU	Action when unable to communicate	DTC detection (Driver detectable)
VSC Control (Controls driving force while VSC is in operation)		Rx	Tx	Rx						VSC function stops	Detectable (Lamp comes on)
VSC Control (Controls driving force while VSC is in operation)	Rx	Rx								VSC function stops	Detectable (Lamp comes on)
Dynamic Radar/Laser Cruise (Maintains vehicle-to-vehicle distance)	Tx Rx	Tx Rx			Tx Rx					Vehicle-to-Vehicle distance control does not operate	Detectable (Lamp comes on)
Back Monitor (Exterior view from rear of vehicle is displayed while reversing)			Tx			Rx				Back monitor only	Detectable (Exterior view from rear of vehicle is not displayed while reversing)
Air Suspension Control (Controls suspension properly based on vehicle conditions)	Tx	Tx					Rx			Control stops	Detectable (Air suspension does not display)
Meter Display (Displays operation condition and DTCs)	Tx	Tx						Rx	Tx	Lamp does not come on or remains on	Recognizable from indicator light malfunction
Pre - collision Safety (Skid control ECU brings BA in standby mode and seat belt is fastened by seat belt control ECU when distance control ECU determines that collision is unavoidable)		Rx			Tx				Rx	Pre-collision safety system does not operate	Detectable (Lamp comes on)

HINT:

Rx: Reception from each ECU (sensor).
Tx: Transmission to each ECU (sensor).