Failsafe Chart

1. FAIL-SAFE FUNCTION

(a) 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.

(b) Relationships between components and system functions and effects of communication failure on these functions. (For further details, see the pages for each system.)

Function

(Skid Control ECU)

Power Steering ECU

Center Airbag Sensor Assembly

Air conditionin g Amplifier

Combinati on Meter ECU

Main Body ECU

Condition when communic ation impossibl e

DTC detection (Driver detectable)

ABS control (Controls driving force while

ABS in operation)

0*1

(Gradually stops controlling during ABS

control)

Detectable (Light comes on)

Electric power steering (Outputs assist current)

O

O

Steering force slightly increased at less than 43.5 mph (70 km/h) Steering force slightly reduced at 43.5 mph (70 km/h) or more

Detectable (Light comes on)

Event recorder (Tracks event data such as vehicle speed and accelerator opening angle and records data)

O

O

Data not recorded

None

Air conditioning control PTC heater control

O

0*2

PCT heater function stops

None (Air conditioning inoperative)

Meter Display (Displays operation condition and DTCs)

O

o

O

O

O

Light dose not come on, illuminates abnormally, or blinks abnormally

Detectable (Abnormal display)

Function

(Skid Control ECU)

Power Steering ECU

Center Airbag Sensor Assembly

Air conditionin g Amplifier

Combinati on Meter ECU

Main Body ECU

Condition when communic ation impossibl e

DTC detection (Driver detectable)

Buzzer control

O

O

Buzzer function stops

None (Buzzer does not sound)

Illumination control

O

Light illumination rheostat inoperative

None

(Rheostat inoperative)

Power door lock control

O

O

O

Unlock permitted

None (Wireless door lock operation)

HINT:

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