Toyota Sequoia (2005). Manual - part 332

H23980

Side Airbag Assembly 
Deployment Signal

Deceleration Sensor ON

Electric Safing Sensor ON

AND

OR

Airbag Inflating

Curtain Shield Airbag Sensor Assembly

Airbag Sensor Assembly

Curtain Shield Airbag Assembly

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1123

1317

(c)

w/ Side and curtain shield airbag:
Operation in case of rear 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 curtain shield 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.

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

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1318

(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

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DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1125

1319

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.

DI6OW–27

Warning Light Check

P. 

DI–1147

END

P. 

DI–1127

P. 

DI–1137

DTC Check (Read Past DTC)

Symptom Simulation

Normal
System Code

DTC Check

Warning Light ON

Trouble
Code

Warning Light
Remains OFF

Circuit Inspection

Identification of Problem

Repair

Warning Light Check

DTC Check (Read Past DTC)

Confirmation Test

Remains ON

Remains OFF

Clear DTC

Item inside              are titles of pages in this manual,
with the page number in the bottom portion. See the
pages for detailed explanations.

1

2

4

3

5

7

8

9

10

DTC Chart

DTC Chart

6

11

12

P. 

DI–1155

P. 

IN–35

P. 

DI–1161

 – 

DI–1498

Remains OFF

Remains ON

Vehicle Brought to Workshop

Customer Problem Analysis

DTC Check (Read Present DTC)

P. 

DI–1155

P. 

DI–1147

P. 

DI–1147

P. 

DI–1147

P. 

DI–1137

P. 

DI–1147

Step 3, 4, 8, 9, 10, 12: Diagnostic steps permitting the use

of the hand–held tester.

DI–1126

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1320

HOW TO PROCEED WITH TROUBLESHOOTING