CAN COMMUNICATION SYSTEM FAIL-SAFE CHART

FAIL-SAFE FUNCTION

1. When communication fails in any of the CAN bus wires (communication wires), a fail-safe function(s) will operate. The fail-safe function that is specified for each system operates to prevent those systems from malfunctioning.

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

   Function (Function Description)	Control Master	System Related	Fail-safe Operation	DTC (Driver Detectable)
   VDIM Control (Controls driving force while VDIM is operating)	Skid control ECU	Power management control ECU Steering angle sensor Yaw rate sensor Skid control ECU	VDIM functions are prohibited	U0123 U0124 U0126 U0293 (Warning and indicator lights come on)
   Regenerative Braking (Motor acts as a generator, charging HV battery using force from rotation of the wheels)	Skid control ECU	Power management control ECU Skid control ECU	Regenerative braking is prohibited	U0129 (Warning and indicator lights come on)
   Electric power steering control (Assist output current)	Power steering ECU	Skid control ECU Center airbag sensor assembly	Control continues with steering assist force based on a vehicle speed of approximately 100 km/h (62.2 mph)	U0129 (Indicator lights come on)
   Entry and start function/Power door lock control	Certification ECU Main body ECU	Certification ECU Main body ECU	Doors cannot be unlocked or locked using entry and start/wireless function	-
   Coolant temperature gauge (Combination meter)	Combination meter	ECM	Lower than middle on coolant temperature gauge	U0100
   Speedometer display (Combination meter)	Combination meter	Skid control ECU	Speedometer displays 0 km/h (0 mph)	U0129
   Hybrid system indicator (Combination meter)	Combination meter	Power management control ECU	Hybrid system indicator position is maintained as it was before interruption	-
   Energy monitor display (Multi-information display)	Combination meter	Power management control ECU	Display becomes black (only measurement units are displayed)	-
   Driving range display (Multi display)	Navigation ECU	Combination meter Skid control ECU Power management control ECU ECM	Display updating is stopped Values for driving range are cleared	U0155
   Energy monitor display (Multi display)	Navigation ECU	Power management control ECU	Display updating is stopped	U0293
   Parking assist monitor system	Navigation ECU Parking assist ECU	Main body ECU Skid control ECU Power management control ECU ECM Steering angle sensor	Parking guide lines are not displayed	U0100 U0293 U0126 U0142 (Inoperative message is displayed)
   Power back door control	Main body ECU	Power back door ECU Main body ECU Combination meter	Power back door function is prohibited	U0230
   Headlight swivel/leveling control (Headlight control)	AFS ECU	Main body ECU Skid control ECU Power management control ECU Steering angle sensor	Swivel and/or leveling control is prohibited	U0293 U0129 U0142 U0126 U0101 (Indicator lights come on)
   Dynamic radar cruise control (Maintains vehicle-to-vehicle distance)	Driving support ECU	Seat belt control ECU Main body ECU Combination meter Skid control ECU Power management control ECU ECM Steering angle sensor Yaw rate sensor	Vehicle-to-vehicle distance control is prohibited	U1104 U0122 U0123 U0126 U0293 U1100 (Warning and indicator lgihts come on)
   Side monitor function	Parking assist ECU	Main body ECU Skid control ECU Power management control ECU ECM Steering angle sensor	Side monitor is not displayed	U0073 U0100 U0293 U0126 U0142 U0129 (Inoperative message is displayed)
   LEXUS parking assist-sensor function (Provides notification when an obstacle is detected)	Parking assist ECU Clearance warning ECU	Main body ECU Navigation ECU Combination meter ECM Air conditioning amplifier	LEXUS parking assist-sensor function is prohibited	U0155 U0142
   Air suspension control	Suspension control ECU	Driving support ECU AFS ECU Main body ECU Navigation ECU Yaw rate sensor Skid control ECU Power management control ECU ECM Suspension control ECU	Height control is set to "normal mode" Luggage mode is prohibited	U0073 U0100 U0101 U0122 U0124 U0293 U0140 (Warning light comes on)
   Pre-crash safety control (Requests braking and seat belt tightening when an unavoidable collision possibility is detected)	Seat belt control ECU	Driving support ECU Center airbag sensor assembly Skid control ECU Seat belt control ECU Main body ECU	Pre-crash safety control is prohibited	U0122 U0140 U0151 U1104 (Indicator light comes on)
   Power tilt and power telescopic steering column control	Tilt and telescopic ECU	Front power seat switch Main body ECU Combination meter	Driving position memory function is prohibited Auto away/return function is prohibited	- (Indicator light comes on)
   Air conditioning control	Air conditioning amplifier	Main body ECU Navigation ECU Combination meter ECM Power management control ECU	Air conditioning function(s) are prohibited	U0100 U0101 U0293 U0131 U0142 U0155
   Seat position memory	Front power seat switch	Tilt and telescopic ECU Main body ECU Combination meter	Auto memory recall is prohibited Memory is prohibited	-
   Outer mirror control	Outer mirror control ECU	Main body ECU	Operation of outer mirrors is prohibited	U0142
   Active stabilizer control	Front active stabilizer control ECU Rear active stabilizer control ECU	Steering angle sensor Yaw rate sensor Skid control ECU	Active stabilizer system control is prohibited	U1108 U1109 U0122 U0126 U0123 (Inoperative message is displayed)