Toyota Venza: Fail-safe Chart

Toyota Venza Service Manual / Networking / Can Communication System / Fail-safe Chart

FAIL-SAFE CHART

1. FAIL-SAFE FUNCTION

(a) 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.

(b) Effects on each system when communication is impossible are shown in the table below. (For further details, see the pages for each system.)

Function (Function Description)	Control Master	System Related	Fail-safe Operation	DTC (Driver Detectable)
ABS control (Controls driving force while ABS in operation)	Skid control ECU	ECM Yaw rate sensor	ABS control is inoperative. (ABS control gradually stops.)	U0073 U0100 U0124 (Warning and indicator lights come on)
TRC control (Engine power control by VSC / TRC)	Skid control ECU	ECM Yaw rate sensor Steering angle sensor	ABS / VSC control is inoperative. (ABS / VSC control gradually stops.)	U0073 U0100 U0123 U0124 U0126 (Warning and indicator lights come on)
VSC control (Controls driving force while VSC in operation)	Skid control ECU	ECM Yaw rate sensor Steering angle sensor	ABS / VSC control is inoperative. (ABS / VSC control gradually stops.)	U0073 U0100 U0123 U0124 U0126 (Warning and indicator lights come on)
Electric power steering control (Speed of vehicle induction type torque control)	Power steering ECU	ECM Skid control ECU	Depression of EPS assist (Deterioration of steering assist)	U0100 U0129 (Warning light comes on)
Air conditioning control (Air conditioning control in cabin)	Air conditioning amplifier	ECM Combination meter Main body ECU	Air conditioning function and PTC heater function stop.	U0100 U0131 U0142 U0155 (Air conditioning is inoperative)
Four wheel drive control	4WD control ECU	ECM Skid control ECU Yaw rate sensor Steering angle sensor Main body ECU Air conditioning amplifier	Fixed torque distribution	U0073 U0100 U0123 U0124 U0126 U0129 (Warning and indicator lights come on)
Headlight swivel / Leveling control (Headlight control)	AFS ECU	ECM Skid control ECU Steering angle sensor Main body ECU	Swivel control stops. (Leveling control remains on.)	- (Indicator light blinks)
Entry function / Power door lock control	Certification ECU	Main Body ECU	Unlock permitted	U0327 U1002 (Wireless door lock cannot operate)
Air conditioning control (Controls air conditioning functions such as set temperature adjustment, air outlet selection, etc. using navigation receiver assembly.)	Navigation receiver assembly	Air conditioning amplifier	When set temperature is shown on multi-display, set temperature display turns off. Air conditioning function(s) are prohibited. A message indicating to check air conditioning amplifier connection appears on multi-display.	U0073
Fuel consumption display (Displays graph of fuel consumption per minute and history of total fuel consumption.)	Navigation receiver assembly Radio and display receiver assembly	ECM Combination meter Skid control ECU	If a communication interruption occurs, values are not displayed.	U0100 U0129 U0155
Destination determination (Determines the destination based on the destination symbol and destination package information and selects the display language, time zone, etc.)	Navigation receiver assembly Radio and display receiver assembly	Main Body ECU	Determines the destination according to the last received value and operates accordingly (if there is no last received value, the system operates using the default value).	U0140
Intuitive parking assist system setting / Notification (Controls settings for clearance sonar screen notifications which are set by operating the touch panel of the display, displays sonar status and plays voice warnings.)	Navigation receiver assembly Radio and display receiver assembly	ECM Clearance warning ECU assembly	Clearance sonar screen is turned off.	U0100
Time stamp function (Matches the relative time from the main body ECU with the absolute time acquired from the GPS.)	Navigation receiver assembly Radio and display receiver assembly	Main Body ECU	None	U0073 U0140
Outer mirror control	Outer mirror control ECU assembly	Main Body ECU	Operation of outer mirrors is prohibited.	U0142
Seat position memory	Position control ECU and switch assembly	ECM Combination meter Main Body ECU	Auto memory recall is prohibited. Memory is prohibited.	-
Parking assist system control Judges shift lever position Judges vehicle speed	Clearance warning ECU assembly	ECM TCM Combination meter Main Body ECU	Obstacle detection is stopped.	U0100 U0101 U0142 U0155

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