Toyota Sequoia (2005). Manual - part 331

DIDGH–01

H24019

Spiral Cable

Front 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
Pad

Front 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)

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1119

1313

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

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1314

SYSTEM DIAGRAM

DIDGJ–02

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1121

1315

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.

H23978

Fig. 1

Fig. 2

Airbag Sensor Assembly

Safing Sensor
ON

Deceleration
Sensor ON

Airbag Inflating

AND

H23979

Airbag Sensor Assembly

Deceleration
Sensor ON

Airbag Inflating

AND

Side Airbag Sensor Assembly

Electronic Safing
Sensor ON

DI–1122

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1316

2.

IGNITION JUDGEMENT AND CONDITIONS

(a)

Operation in case of front collision.
(1)

When the vehicle collides in the hatched area (Fig. 1) and shock is larger than a predetermined
level, the airbags (driver and front passenger) are activated automatically. The deceleration sen-
sor of the airbag sensor assembly determines the need for ignition in response to collisions within
the hatched area based on the signal from the deceleration sensor of the front airbag sensor.

(2)

Safing sensor of the airbag sensor assembly is designed to activate at by a smaller deceleration
rate than the deceleration sensor. As illustrated in Fig. 2 below, when both the safing sensor and
deceleration sensor go on simultaneously, current flows to the squib and ignition occurs.

(b)

w/ Side and curtain shield airbag:
Operation in case of front side collision.
Electronic safing sensor of the airbag sensor assembly is designed to activate at a smaller deceleration
rate than the deceleration sensor of the side airbag sensor assembly. As illustrated below, when both
the electronic safing sensor and deceleration sensor go on simultaneously, current flows to the squib
and ignition occurs.