NETWORKING: CAN COMMUNICATION SYSTEM: FAIL-SAFE CHART (2008 Sequoia)

FAIL-SAFE CHART

1. FAIL-SAFE FUNCTION

(a) When communication fails in any of the main wires (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) The table below shows the effects on each system when communication is impossible. For further details, refer to each system.

Function (Function Description)	Control Master ECU	Related ECU or Sensor	Vehicle Behavior	Indicator and Buzzer
Memory Call (Driver Seat, Mirror, Tilt and Telescopic)	Power seat control ECU	Outer Mirror Control ECU Multiplex Tilt and Telescopic ECU Main Body ECU ECM Combination Meter ECU	Stop memory call function	Nothing
Retractable Mirror	Outer Mirror Control ECU	Main Body ECU	Stop Retractable function	Nothing
Door Mirror Foot Light	Outer Mirror Control ECU	Main Body ECU	Stop door mirror foot light function	Nothing
Tilt and Telescopic: Auto Away/ Return	Multiplex Tilt and Telescopic ECU	Power seat control ECU Main Body ECU	Stop auto away/ return function	Nothing
Power Back Door	Power Back Door ECU	Main Body ECU ECM Combination Meter ECU Bus Buffer ECU	Stop power back door function	Stop "Power Back Door Buzzer"
Alarm	Main Body ECU	Bus Buffer ECU	Not influenced	Nothing
Door Lock Linked Speed	Main Body ECU	Combination Meter ECU Bus Buffer ECU	Not possible to link with speed or shift	Nothing
Illumination	Main Body ECU	Combination Meter ECU	Change status of illumination	Nothing
Power Window	Main Body ECU	Bus Buffer ECU	Not influenced	Nothing
DRL	Main Body ECU	ECM	DRL does not illuminate	Nothing
Main Body ECU Buzzer Function	Main Body ECU	Power Back Door ECU	Stop some buzzer function	Stop "Power Back Door Buzzer"
Observation Function of MS Bus Communication Failure	Main Body ECU	Power seat control ECU Outer Mirror Control ECU Multiplex Tilt and Telescopic ECU Power Back Door ECU	Not influenced	Nothing
Engine Control	ECM	-	Not influenced	Light on "MIL"*1
Normal Brake	Skid Control ECU	-	Not influenced	Nothing
ABS, VSC	Skid Control ECU	ECM Steering Angle Sensor 4WD Control ECU	Stop ABS operation Stop VSC operation Stop traction control	Light on "VSC Warning Light" Light on "Slip Indicator Light" Light on "ABS Warning Light" Light on "Brake Warning Light"
Meter Buzzer Function	Combination Meter ECU	Main Body ECU ECM Skid Control ECU Center Airbag Sensor	Stop some buzzer function	Stop "Key Reminder Buzzer" Stop "Seat Belt Warning Buzzer" Stop "Parking Brake ON Drive Warning Buzzer" Stop "Half-open Warning Buzzer" Stop "4WD Buzzer" Stop "Slide Roof Buzzer" Stop "Sports Shift Reject Buzzer" Stop "Leader Cruise Buzzer"
Meter Indicator Function	Combination Meter ECU	Power Steering Control ECU Main Body ECU ECM Skid Control ECU Center Airbag Sensor 4WD Control ECU	Does not illuminate or always illuminates	Light on "Airbag Warning Light" Light on "BRAKE Warning Light" Light on "ABS Warning Light" Light on "PS Warning Light"
Data Recorder	Center Airbag Sensor	ECM Combination Meter ECU	Stop recording	Light on "ABS Warning Light"
A/C	Air Conditioning Amplifier	Main Body ECU ECM Combination Meter ECU	Stop air conditioning	Nothing
Remote Start	Bus Buffer ECU	Main Body ECU	Not possible to control by wireless	Nothing
4WD	4WD Control ECU	ECM Skid Control ECU Combination Meter ECU Air Conditioning Amplifier	Not possible to change between 4WD and 2WD	Nothing
Air Suspension	Suspension Control ECU	ECM Skid Control ECU Steering Angle Sensor 4WD Control ECU	Not influenced	Nothing
Power Steering	Power Steering ECU	ECM Skid Control ECU Steering Angle Sensor	Stop assist steering	Light on "PS Warning Light"
Laser Cruise Control	Distance Control ECU	ECM Skid Control ECU	Stop laser cruise control	Indicate at Multi Display Light on "Master caution indicator" Sound " Laser Cruise Buzzer"

NOTICE:

*1: MIL lights on only during VSC or ABS failure status.