seat TOYOTA SEQUOIA 2001 Service Owner's Manual

DIDGH±01
H24019
Spiral CableFront Passenger
Airbag Assembly
Side Airbag Assembly LH (*1)
Front Seat
Outer Belt LH
Side Airbag Sensor
Assembly LH (*1)Side Airbag
Assembly RH (*1)
Front Airbag
Sensor LH Steering Wheel
PadFront Airbag
Sensor RH
Curtain Shield Airbag
Assembly RH (*1) Curtain Shield Airbag
Assembly LH (*1)
Curtain Shield Airbag
Sensor Assembly RH (*1)
SRS Warning Light
Side Airbag Sensor
Assembly RH (*1)
Front Seat
Outer Belt RH
RSCA OFF Indicator (*1)Passenger Airbag
ON/OFF Indicator Integration Control and Panel: Combination Meter:
Seat Position
Airbag Sensor
Assembly
Curtain Shield Airbag
Sensor Assembly LH (*1)
Occupant Classification ECU
Front Seat Inner Belt RH
Front Seat Inner Belt LH
Airbag Sensor Assembly*1: w/ Side and Curtain Shield Airbag
RSCA OFF
Switch (*1)
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1119
1313 Author: Date:
2005 SEQUOIA (RM1146U)
LOCATION

DIDGI±01
H23977
Front Airbag Sensor LH
Side Airbag Sensor
Assembly LH (*1)
Curtain Shield Airbag
Sensor Assembly LH (*1)
Front Seat Inner Belt
LH/Seat Position Airbag
Sensor Assembly
RSCA OFF Switch (*1)
Front Seat Inner Belt RH
Occupant Classification
Sensors (Front LH, Front
RH, Rear LH, Rear RH)Steering Wheel Pad (D Squib)
Front Passenger Airbag Assembly (P Squib)
Side Airbag Assembly LH
(Side Squib LH) (*1)
Curtain Shield Airbag Assembly LH
(Curtain Shield Airbag LH Squib) (*1)
Front Seat Outer Belt LH (P/T Squib LH)
Combination Meter
(SRS Warning Light/RSCA OFF Indicator (*1))
Integration Control and Panel
(Passenger Airbag ON/OFF Indicator)
ECM
DLC3 Airbag
Sensor
Assembly
Occupant
Classification
ECU Front Airbag Sensor RH
Side Airbag Sensor
Assembly RH (*1)
Curtain Shield Airbag
Sensor Assembly RH (*1)Side Airbag Assembly RH
(Side Squib RH) (*1)
Curtain Shield Airbag Assembly RH
(Curtain Shield Airbag RH Squib) (*1)
Front Seat Outer Belt RH (P/T Squib RH)
*1: w/ Side and Curtain Shield Airbag DI±1120
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1314 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DIAGRAM

DIDGJ±02
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1121
1315 Author: Date:
2005 SEQUOIA (RM1146U)
SYSTEM DESCRIPTION
1. DESCRIPTION OF SUPPLEMENTAL RESTRAINT SYSTEM
(a) General description.
In this system, the airbag sensor assembly installed on the floor under the A/C unit determines whether
or not to activate the SRS airbags (driver airbag, passenger airbag, front seat airbags and curtain
shield airbags) and seat belt pretensioners by receiving the collision signal from each sensor (exclud-
ing the airbag sensor assembly). When there is trouble in the system, the airbag sensor assembly turns
on the SRS warning light on the combination meter to inform the driver.
(b) Description of the dual stage control.
The airbag sensor assembly controls the dual stage deployment of the driver airbag in the steering
wheel pad and the passenger airbag on the instrument panel. The airbag sensor assembly controls
the dual stage deployment of the driver airbag according to the collision impact, seat position and seat
belt ON/OFF state. It also controls the dual stage deployment of the passenger airbag according to
the collision impact and seat belt ON/OFF state.
(c) Description of the roll±over function.
(1) The airbag sensor assembly detects inclination signals from the inclination sensor installed on
the vehicle. The roll±over function ensures passenger safety by using these signals to activate
the RH and LH curtain shield airbag assembly and seat belt pretensioner when vehicle inclination
exceeds the specified value.
(2) An RSCA OFF switch (roll±over sensing curtain shield airbag OFF switch), which allows optional
deactivation of the roll±over function, is installed on the vehicle.
(d) Description of check mode (signal check).
This airbag sensor assembly is operable using the check mode of the hand±held tester function. Check
mode can detect and output DTC by using a hand±held tester to switch the airbag sensor assembly
to the check mode.
A simulation method is used, if the malfunction cannot be reproduced during troubleshooting (the mal-
function is temporarily solved, etc.). In this case, joggling each connector, or driving on a city or rough
road with the airbag sensor assembly in check mode makes it possible to obtain a more accurate mal-
function condition.

H24635
Rollover Detection:
Side Collision and Rollover Detection:(a)
(b)
Airbag Sensor Assembly
Roll Rate Sensor 1
Roll Rate Sensor 2
Lateral Deceleration Sensor
Curtain Shield Airbag
Assembly (LH and RH)
Seat Belt Pretensioner
(LH and RH)
(c) (b)
Airbag Sensor Assembly
Roll Rate Sensor 1
Roll Rate Sensor 2
Lateral Deceleration Sensor
Curtain Shield Airbag
Sensor Assembly
Side Airbag Sensor
Assembly (
)Curtain Shield Airbag
Assembly (LH and RH)
Seat Belt Pretensioner
(LH and RH)Side Airbag of Collision
Side (
)
Activate depending on the
condition of the collision.
: DI±1124
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1318 Author: Date:
2005 SEQUOIA (RM1146U)
(d) w/ Side and curtain shield airbag:
Roll sensing of curtain shield airbag control.
(1) The airbag sensor assembly contains a roll rate sensor and roll rate sensor (that determine the
inclination angle the vehicle) and a lateral deceleration sensor (that determine the lateral force
that is applied to the vehicle). These sensors detect the vehicle's roll angle, rotational speed, and
lateral acceleration speed.
(2) Based on the information obtained from sensors, the airbag sensor assembly makes an overall
judgment of the vehicle's roll angle rotational speed, and lateral acceleration speed. If the airbag
sensor determines that the vehicle has rolled over due to cause other than the side collision, it
deploys the right and left curtain shield airbags and the front right and left seat belt pretensioners.
(3) This system provides a roll sensing of curtain shield airbags cutoff switch (RSCA OFF switch)
on the driver side of the instrument panel with which the driver can stop the operation of the func-
tion.
(4) By operating the RSCA OFF switch and while the roll sensing of the curtain shield airbag control
is OFF, and when the airbag sensor assembly judges to operate the side and curtain shield air-
bag system in the event of side collision, it is no need prohibit this operation.

H23981
Occupant
Classification Sensor
Occupant
Classification ECU
Occupant Load
A
A ± A Cross Section
Occupant
Classification Sensor
Occupant
Classification Sensor
A
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1125
1319 Author: Date:
2005 SEQUOIA (RM1146U)
3. DESCRIPTION OF OCCUPANT CLASSIFICATION SYSTEM
(a) GENERAL DESCRIPTION.
(1) In the occupant classification system, the occupant classification ECU calculates the weight of
the occupant based on a signal from the occupant classification sensor. This system recognizes
the occupant to be a child if it detects a weight of less than 36 kg (79.37 lb), and disables the
front and side airbags.
(2) This system is mainly comprised of 4 occupant classification sensors that detect the load on the
front passenger seat. The occupant classification ECU controls the system, and the passenger
airbag ON/OFF indicator indicates the ON/OFF condition of the front passenger airbag assembly
and side airbag assembly (passenger side).
(b) OCCUPANT CLASSIFICATION SENSOR.
The occupant classification sensors are installed on 4 brackets connecting the seat rail and seat frame.
Accordingly, when load is applied to the passenger seat by an occupant sitting in it, the occupant classi-
fication sensors register a distortion.

DIDGK±01
A08841
Hand±held Tester
DLC3
DI±1128
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1322 Author: Date:
2005 SEQUOIA (RM1146U)
INITIALIZATION
ZERO POINT CALIBRATION AND SENSITIVITY CHECK
NOTICE:
Make sure that the seat is not occupied before performing
the operation.
HINT:
Perform the zero point calibration and sensitivity check if any of
the following conditions occur.

The occupant classification ECU is replaced.

Accessories (seatback tray and seat cover, etc.) are
installed.

The passenger seat is removed from the vehicle.

The passenger airbag ON/OFF indicator (ºOFFº) comes
on when the passenger seat is not occupied.

The vehicle is brought to the workshop for repair due to
an accident or a collision.
Zero point calibration and sensitivity check procedures.
HINT:
Make sure that zero point calibration has finished normally, and
then perform the sensitivity check.
(1) Adjust the seat position according to the table be-
low.
Adjustment ComponentPosition
Slide DirectionRearmost position
Reclining AngleUpright position
Headrest HeightLowest position
Lifter HeightLowest position
(2) Connect the hand±held tester to the DLC3.
(3) Turn the ignition switch to the ON position.
(4) Perform the zero point calibration by following the
prompts on the tester screen shown in 2 pages lat-
er.
HINT:
Refer to the hand±held tester operator's manual for further de-
tails.
OK:
The ºCOMPLETEº is displayed.

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1129
1323 Author: Date:
2005 SEQUOIA (RM1146U)
(5) Perform the sensitivity check by following the
prompts on the tester screen shown in 2 pages lat-
er.
(6) Confirm that the beginning sensor reading is within
the standard value.
OK:
Standard value: ±3.2 to 3.2 kg (±7 to 7 lb)
(7) Place a 30 kg (66.14 lb) weight (eg. a 30 kg (66.14
lb) of lead mass) onto the passenger seat.
(8) Confirm that the sensitivity is within the standard
value.
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
HINT:

When performing the sensitivity check, use a solid metal
weight (the check result may not appear properly if the
weight made from liquid is used).

When the sensitivity deviates from the standard value, re-
tighten the bolts of the passenger seat taking care not to
deform the seat rail. After performing this procedure, if the
sensitivity is not within the standard value, replace the
front seat assembly RH.

When zero point calibration has not finished normally, re-
place the front seat assembly RH.

DIAGNOSTIC MENU
OCCUPANT DETECT
1: DATA LIST
2: DTC INFO
5: ZERO CALIBRATION
6: SENSITIVITY CHK 4: SNAPSHOT
NOTICE
Please confirm seat
position.
Slide: Max rear
Recline: Max upright
Headrest: Max down
Lifter: Max down
PRESS [ENTER] or [EXIT]NOTICE
Confirm that
nothing is placed
on the passenger
seat.
PRESS [ENTER] or [EXIT]
NOTICE
Do you wish to
start ºZERO
CALIBRATIONº?
PRESS [YES] or [NO]ZERO CALIBRATION
COMPLETED
Next, perform the
SENSITIVITY CHECK.
PRESS [ENTER]
ZERO POINT CALIBRATION PROCEDURE
º1: DIAGNOSISº ± º1: OBD/MOBDº ± ºMODEL YEARº ± ºMODEL SELECTION = SEQUOIAº ±
Select the option parts ± º9: OCCUPANT DETECTº ± Refer to the following screen flow.
ZERO CALIBRATION
FAILED
EEPROM writing error
Please check DTCs
PRESS [ENTER]ZERO CALIBRATION
FAILED
Failed to SECURITY
ACCESS.
PRESS [ENTER]Try again
ZERO CALIBRATION
FAILED
Sensor range
Front Left
PRESS [ENTER] over malfunction
Front Right
Rear Left
Rear Right±±±±[ ]
±±±±[ ]
±±±±[ ]
±±±±[ ]Sensor information is
expressed as OK, MAX or MIN
in [ ].
If MAX or MIN is displayed,
replace the front seat assembly RH. Perform sensitivity check.
Perform DTC check and repair. DI±1130
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1324 Author: Date:
2005 SEQUOIA (RM1146U)

SENSITIVITY CHECK PROCEDURE
º1: DIAGNOSISº ± º1: OBD/MOBDº ± ºMODEL YEARº ± ºMODEL SELECTION = SEQUOIAº ±
Select the option parts ± º9: OCCUPANT DETECTº ± Refer to the following screen flow.
DIAGNOSTIC MENU
OCCUPANT DETECT
1: DATA LIST
2: DTC INFO
5: ZERO CALIBRATION
6: SENSITIVITY CHK 4: SNAPSHOT
NOTICE
Please confirm
that nothing is
placed on the
passenger seat.
PRESS [ENTER] or [EXIT]SENSITIVITY CHECK
Beginning sensor
reading should be
±3.2 to 3.2 kg.
PRESS [ENTER]
SENSITIVITY CHECK
PRESS [ENTER]
(±7 to 7 lbs)
Sensor reading
0.00 kg
Place 30 kg (66 lbs)
weight on passenger
seat. Sensor reading
should be 27 to 33 kg.
(59 to 73 lbs)
Sensor reading
0.00 kg*1: kg @ lb
Unit can be changed based on unit conversion setting.
[System Selection Screen]
º1: DIAGNOSISº ± º9: SETUPº ± º4: UNIT CONVERSIONº
± ºWEIGHTº (kg @ lbs) (*1)
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1131
1325 Author: Date:
2005 SEQUOIA (RM1146U)

DI6P2±15
DI±1132
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1326 Author: Date:
2005 SEQUOIA (RM1146U)
PROBLEM SYMPTOMS TABLE
Proceed with troubleshooting of each circuit in the table below.
SymptomSuspected AreaSee page

The front passenger seat condition differs from the indication by
the passenger airbag ON/OFF indicator (DTC is not output).
Trouble in indication of Passenger airbag ON/OFF indica-
torDI±1485

With the ignition switch is in ON position, the SRS warning light
sometimes comes on after approximately 6 seconds.
SRS warning light circuit (Always comes on, when DTC is
not output)DI±1491

The SRS warning light always comes on even when DTC is not
output.
SRS warning light circuit (Always comes on, when DTC is
not output)DI±1491

With the ignition switch is in the ON position, the SRS warning
light does not come on.
SRS warning light circuit (Does not come on, when igni-
tion switch is turned to the ON position)DI±1496

Although an SRS warning light operates normally, DTC or a
normal system code is not display.
TC terminal circuitDI±1498

Although terminals TC and CG of DLC3 are not connected, DTC
or a normal system code is display.
TC terminal circuitDI±1498