Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VJUP
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: SEAT: AUTO ACCESS SEAT SYSTEM: FAIL-SAFE CHART; 2016 - 2020 MY Sienna [12/2015 -        ]

FAIL-SAFE CHART

1. AUTO ACCESS SEAT OPERATION IN FAIL-SAFE MODE

(a) If there is a malfunction in any motor or switch, auto access seat operation is prohibited.

(1) Power Supply Unstable

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

System function suspended

Low voltage/high voltage detected

  • Voltage reduced
  • Power source disconnected
  • High voltage
  • Motor output prohibited
  • DTC detection prohibited
  • Buzzer sounding prohibited

Voltage recovery conditions met and operation switch off detected

(2) Motor Malfunction

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor

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DTC

Reclining Motor Error

Front-rear Slide Motor Error

Swivel Motor Error

Outward Slide Motor Error

Up-down Motor Error

11

12

13

14

15

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Operation of all motors prohibited

For a stopped motor, 32 edges or more are detected in a 0.5 second period

Motor temporarily stopped + buzzer (C) sounds → position information erased, change to independent operation mode → operation of all motors prohibited, diagnostic code stored in RAM

Diagnostic code cleared in service operation mode or by power supply off

(3) Pulse Not Generated

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor

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Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  
 

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor
 

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DTC

Reclining Pulse Error

Front-rear Slide Pulse Error

Swivel Pulse Error

Outward Slide Pulse Error

Up-down Pulse Error

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22

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24

25

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

System function suspended

When the applicable motor is operating and the mask time passes without even 1 edge being output, and this occurs 7 times

Operation halted, buzzer (C) sounds → position information erased, change to independent operation mode
  • Diagnostic code cleared in service operation mode or by power supply off
  • Origin point position information calibrated in independent operation mode

(4) Limit Switch Malfunction

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

  

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor

Stuck ON Malfunction

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Except Limit Switch Area

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Past Limit Switch Area

  

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Within Mechanical Lock Area

  

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Mechanical Lock Excessive Load Detected

    

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Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  
 

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Applicable Motor

  

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor

Stuck ON Malfunction

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Except Limit Switch Area

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Limit Switch ON → OFF Detected

    

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Past Limit Switch Area

  

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Within Mechanical Lock Area

  

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DTC

Reclining Pulse Error

Front-rear Slide Pulse Error

Swivel Pulse Error

Outward Slide Pulse Error

Up-down Pulse Error

41

42

43

44

45

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Egress prohibited

Ingress allowed

Limit switch logic and pulse count do not match

  • Limit switch logic judged to be abnormal

During Access Seat Mode:

  • Operation halted, buzzer (C) sounds → egress prohibited, ingress allowed

During Power Seat Mode:

  • Operation halted, buzzer (C) sounds → egress prohibited, forced ingress operation allowed
  • Diagnostic code cleared in service operation mode or by power supply off

During Access Seat Mode:

  • Ingress completed

During Power Seat Mode:

  • Forced ingress by No. 2 power seat switch (ingress switch)

(5) Mechanical Lock Non-detection Malfunction

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor
   

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DTC

Mechanical Lock Undetection Error

73

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

System function suspended

While swivel motor is operating in the egress direction, the swivel motor position passes the end of the mechanical lock (+ margin-of-error pulse) but mechanical lock excessive load is not detected

Operation halted + buzzer (C) sounds → position information erased, change to independent operation mode
  • Diagnostic code cleared in service operation mode or by power supply off
  • Origin point position information calibrated in independent operation mode

(6) Pulse Out-of-sync

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor
 

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DTC

Pulse Differential

31

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

System function suspended

When the basic pulse out-of-sync for two applicable motors is 160 edges or more for 0.2 continuous seconds

In 0.2 continuous seconds, 202 edges or more are detected even once

Operation halted, buzzer (C) sounds → position information erased, change to independent operation mode
  • Diagnostic code cleared in service operation mode or by power supply off
  • Origin point position information calibrated in independent operation mode

When the basic pulse out-of-sync for two applicable motors is 160 edges or more for 0.2 continuous seconds

Operation halted, buzzer (H) sounds → pressing the operated switch again will not cause the buzzer to sound
  • All operated switches detected as off
  • Basic pulse out-of-sync detected as less than 160 edges

(7) Multiple Operation Switches Pressed

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Operated Switches

All operated switches (including seat control transmitter)

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

System function suspended

During Access Seat Mode:

  • Detection that 2 or more operation switches are pressed at the same time

During Power Seat Mode:

  • Detection that 2 or more operation switches are pressed at the same time

During Independent Operation Mode:

  • Detection that 2 or more operation switches without a combined function after function change are pressed at the same time
  • Detection that a third operation switch with combined function after change is ON

During Operation:

  • Operation halted → no effect when operation switch pressed again

During Operation Halt:

  • Operation halt continues → no effect when switch pressed again

Detection that all operation switches are off

(8) Operating Conditions Not Met 1

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Applicable Signal

Shift P Signal

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Egress prohibited

Ingress prohibited

During IG ON, shift P signal off detected

During Operation:

  • Operation halted + buzzer (D) sounds → egress prohibited, ingress prohibited → no effect when switch pressed again (buzzer (D) continues to sound)

During Operation Halt:

  • Buzzer (D) sounds → egress prohibited, ingress prohibited → no effect when switch pressed again (buzzer (D) continues to sound)
  • Ignition switch off
  • Shift P signal ON detected
  • Change to power seat mode

(9) Operating Conditions Not Met 2

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Applicable Signal

Power Slide Door RH Fully Open Signal

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Operation halted

Power slide door RH fully open signal off detected

During Access Seat Mode (during operation):

  • Operation halted + buzzer (G) sounds → ingress allowed + buzzer (D) sounds → egress prohibited + buzzer (G) sounds

During Access Seat Mode (when stopped):

  • Buzzer (G) sounds → ingress allowed + buzzer (D) sounds, egress prohibited + buzzer (G) sounds

During Independent Operation Mode:

  • Buzzer (G) sounds → no restrictions, buzzer does not sound if operation switch pressed again
  • Power slide door RH fully open signal ON detected
  • Change to power seat mode

(10) Operating Conditions Not Met 3

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Applicable Signal

Buckle Switch Signal

Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Operation halted

Seat belt fastened

During Access Seat Mode (during operation):

  • Operation halted + buzzer (G) sounds → ingress allowed, egress prohibited + buzzer (G) sounds

During Access Seat Mode (when stopped):

  • Buzzer (G) sounds → ingress allowed, egress prohibited + buzzer (G) sounds

During Independent Operation Mode:

  • Buzzer (G) sounds → no restrictions, buzzer does not sound if operation switch pressed again.

Detection that seat belt is unfastened

(11) Pulse Sensor Short

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Operation halted

Voltage drop (6.5 V or lower) detected
  • Motor output prohibited
  • DTC output prohibited
  • Sounding of buzzer prohibited
  • Conditions for voltage recovery met and operated switches detected as off
  • Power supply reconnected and all operated switches detected as off

(12) Buckle Failure

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

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Applicable Signal

Buckle Switch Signal

DTC

Buckle Failure

81

Result of Fail-safe Operation

Detection Condition

Fail-safe Deactivation Condition

Operation halted

Cannot confirm that seat belt is fastened or unfastened for 1.0 seconds or more

Confirmation of seat belt fastened/unfastened status

(13) Motor Continuously Energized

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor

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Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Operation halted

Applicable motor is continuously energized for 60 seconds or more

Operation halted → all operation switches detected as off → wait for operation switch input

All operation switches detected as off

(14) Outside of Area Error

Applicable Mode

Access Seat Mode

Power Seat Mode

Independent Operation Mode

Service Operation Mode

  

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Applicable Motor

Reclining Motor

Front-rear Slide Motor

Swivel Motor

Outward Slide Motor

Up-down Motor

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Result of Fail-safe Operation

Detection Condition

Fail-safe Control Method

Fail-safe Deactivation Condition

Operation halted

Applicable motor goes beyond the mechanical lock area

Operation halted + buzzer (C) sounds → position information erased, change to independent operation mode

Position information initialized in independent operation mode