airbag off TOYOTA SEQUOIA 2001 Service Repair Manual

F09750
DLC3
Ts
CG
± INTRODUCTIONFOR ALL OF VEHICLES
IN±17
17 Author: Date:
2005 SEQUOIA (RM1146U)
(i) AIRBAG SENSOR ASSEMBLY
(1) Never reuse the airbag sensor assembly involved
in a collision when the SRS has deployed.
(2) The connectors to the airbag sensor assembly
should be connected or disconnected with the sen-
sor mounted on the floor. If the connectors are con-
nected or disconnected while the airbag sensor as-
sembly is not mounted to the floor, it could cause
undesired ignition of the supplemental restraint sys-
tem.
(3) Work must be started after 90 seconds from the
time the ignition switch is turned to the ºLOCKº posi-
tion and the negative (±) terminal cable is discon-
nected from the battery, even if only loosening the
set bolts of the airbag sensor assembly.
(j) WIRE HARNESS AND CONNECTOR
The SRS wire harness is integrated with the cowl wire har-
ness assembly and floor wire harness assembly. All the
connectors for the system are also a standard yellow col-
or. If the SRS wire harness becomes disconnected or the
connector becomes broken due to an accident, etc., re-
pair or replace it.
2. FOR VEHICLES EQUIPPED WITH VEHICLE SKID
CONTROL (VSC) SYSTEM
NOTICE:

Even if TRAC is initially OFF, it automatically be-
comes ON when the vehicle speed becomes about 30
km/h (19 mh) or more. Therefore, please drive in the
test mode to avoid dangerous situations caused by
the TRAC control.

VSC/ABS may be failed when the vehicle is driven on
the two±wheel chassis dynamo. Therefore, after driv-
ing on the chassis dynamo, please clear DTC before
normal driving. Please refer to the page DI±899 for the
method of clearing DTC.

Fasten the vehicle with the lock chain.
(a) Confirm VSC system is OFF.
(1) Turn the ignition switch OFF.
(2) Using SST, connect terminals Ts and CG of DLC3.
SST 09843±18040
(3) Start the engine.

DICY7±02
DI±1118
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1312 Author: Date:
2005 SEQUOIA (RM1146U)
SUPPLEMENTAL RESTRAINT SYSTEM
PRECAUTION
NOTICE:
When disconnecting the battery terminal, initialize the following system after the terminal is recon-
nected.
System NameSee Page
Back Door Power Window Control SystemBE±77
1. HANDLING PRECAUTIONS FOR AIRBAG SENSOR
HINT:
In this section, the airbag sensor assembly, front airbag sensor LH, front airbag sensor RH, side airbag sen-
sor assembly LH, side airbag sensor assembly RH, curtain shield airbag sensor assembly LH, curtain shield
airbag sensor assembly RH and seat position airbag sensor assembly are collectively referred to as the air-
bag sensor.
(a) Before starting the following operations, wait at least 90 seconds after disconnecting the negative (±)
terminal of the battery:
(1) Replacement of the airbag sensor.
(2) Adjustment of the front/rear doors of the vehicle equipped with the side airbag and curtain shield
airbag (fitting adjustment).
(b) When connecting or disconnecting the airbag sensor connector, ensure that all of the sensors are
installed in the vehicle.
(c) Do not use an airbag sensor which has been dropped during the operation or transportation.
(d) Do not disassemble the airbag sensor.
2. INSPECTION PROCEDURE FOR VEHICLE INVOLVED IN ACCIDENT
(a) When the airbag has not deployed, confirm the DTC by checking the SRS warning light. If there is any
malfunction in the SRS airbag system, perform troubleshooting.
(b) When any of the airbags have deployed, replace the airbag sensor and check the installation condition.
(c) Perform the zero point calibration and sensitivity check under the condition is listed below (see page
DI±1128).

The occupant classification ECU is replaced.

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

The passenger seat removed from the vehicle.

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

The vehicle is brought to the workshop for repair due to an accident or a collision.
NOTICE:
When an accident vehicle is brought into the workshop for repair, check the flatness of the body side
that is installed on the passenger seat. If the flatness is not within ± 3.0 mm (0.118 in.), repair it to
the specified range (within ± 3.0 mm (0.118 in.)).

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.

DI6OX±17
Supplemental Restraint System Check Sheet
Date Problem Occurred
VIN
Production Date
Licence Plate No.
Odometer Reading
Weather
Temperature
Vehicle Operation
Road Conditions
Details of Problem
Vehicle Inspection, and Repair
History Prior to Occurrence of
Malfunction (Including Supple-
mental Restraint System)
Diagnostic System Inspection
SRS Warning Light
Inspection
DTC Inspection1st Time
2nd Time
1st Time
2nd TimeInspector 's
Name
Fine Cloudy Rainy Snowy Other
Approx.
Starting Idling
Driving [ Constant speed Acceleration Deceleration
Other ]
Remains ON Sometimes comes on Does not come on
Remains ON Sometimes comes on
Normal System Code Trouble Code
Normal System Code Trouble Code[ Code. ]
[ Code. ]km
miles //
//
// Date Vehicle Brought In
Remains ON
Remains ONDoes not come on
Does not come on 1st Time
2nd Time Passenger Airbag
ON/OFF Indicator
InspectionDoes not come on
Customer 's Name
Remains ON
Remains ONDoes not come on
Does not come on 1st Time
2nd Time RSCA OFF Indicator
Inspection
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1127
1321 Author: Date:
2005 SEQUOIA (RM1146U)
CUSTOMER PROBLEM ANALYSIS CHECK

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.

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