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 |
|
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 |
|
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 |
|
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 |
|
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 |
|
Air conditioning function and PTC heater function stop. |
U0100 U0131 U0142 U0155 (Air conditioning is inoperative) |
Four wheel drive control |
4WD control ECU |
|
Fixed torque distribution |
U0073 U0100 U0123 U0124 U0126 U0129 (Warning and indicator lights come on) |
Headlight swivel / Leveling control (Headlight control) |
AFS 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 |
|
U0073 |
Fuel consumption display (Displays graph of fuel consumption per minute and history of total fuel consumption.) |
|
|
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.) |
|
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.) |
|
|
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.) |
|
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 |
|
|
- |
Parking assist system control
|
Clearance warning ECU assembly |
|
Obstacle detection is stopped. |
U0100 U0101 U0142 U0155 |
Diagnosis System
DIAGNOSIS SYSTEM
1. DESCRIPTION
(a) When troubleshooting a vehicle with a diagnosis system, the only difference
from the usual troubleshooting procedure is connecting the Techstream to the vehicle
and reading various data output from the clearance warnin ...
Short in Front Pretensioner Squib LH Circuit (B1905/74-B1908/74)
DESCRIPTION
The front pretensioner squib LH circuit consists of the center airbag sensor
assembly and front seat outer belt assembly LH.
The center airbag sensor assembly uses this circuit to deploy the seat belt pretensioner
when deployment conditions a ...
Stop Light Control Relay Malfunction (C1380/64)
DESCRIPTION
Upon receiving the hill-start assist control operating signal from the skid control
ECU, the relay contact turns on and the stop light comes on.
DTC Code
DTC Detection Condition
Trouble Area
C13 ...