Toyota Sequoia (2005). Manual - part 352

H01007

H10600 H42066

H40997

H23576

CG

TC

DTC B1630/23

DLC3

Curtain Shield Airbag 
Sensor Assembly RH

DTC B1635/24

Airbag 
Sensor 
Assembly

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1203

1397

7

Check curtain shield airbag sensor assembly LH.

PREPARATION:
(a)

Connect the connectors to the airbag sensor assembly.

(b)

Interchange the curtain shield airbag sensor assembly
RH with LH and connect the connectors to them.

(c)

Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.

CHECK:
(a)

Turn the ignition switch to the ON position, and wait for at
least 60 seconds.

(b)

Clear the DTCs stored in memory (see page 

DI–1147

).

(c)

Turn the ignition switch to the LOCK position.

(d)

Turn the ignition switch to the ON position, and wait for at
least 60 seconds.

(e)

Check the DTCs (see page 

DI–1147

).

OK:

DTC B1635/24 is output.

A

DTC B1630/23 is output.

B

DTC B1630/23 and B1635/24 are not

output.

C

HINT:
Codes than other DTC B1630/23 and B1635/24 may be output
at this time, but they are not related to this check.

A

Replace airbag sensor assembly
(see page 

RS–82

).

B

Replace curtain shield airbag sensor assembly
LH (see page 

RS–97

).

C

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page 

DI–1137

).

H02750

O6
Occupant Classification ECU

FSR+

BL1

3

W

W

A21

16

Airbag Sensor Assembly

A21

24

B

B

BL1

5

FSR–

FSR+

FSR–

8

4

DI–1204

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1398

DTC

B1650/32 Occupant Classification System 

Malfunction

CIRCUIT DESCRIPTION

The occupant classification system circuit consists of the airbag sensor assembly and the occupant classifi-
cation system.
If the airbag sensor assembly receives signals from the occupant classification ECU, it determines whether
or not the front passenger airbag assembly, side airbag assembly RH and seat belt pretensioner RH should
be operated.
DTC B1650/32 is recorded when a malfunction is detected in the occupant classification system circuit.

DTC No.

DTC Detecting Condition

Trouble Area

B1650/32

Occupant classification system malfunction

The airbag sensor assembly receives a line short circuit

signal, an open circuit signal, a short circuit to ground sig-

nal or a short circuit to B+ signal in the occupant classifi-

cation system circuit for 2 seconds.

Airbag sensor assembly malfunction

Occupant classification system

Airbag sensor assembly

Floor wire

Seat wire No. 1

WIRING DIAGRAM

DIDGY–01

H10600 H01065

H08008

H24037

Airbag 
Sensor 
Assembly

DLC3

CG

TC

Occupant 
Classification ECU

DTC B1650/32

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1205

1399

INSPECTION PROCEDURE

1

Check DTC (occupant classification ECU).

CHECK:
(a)

Turn the ignition switch to the ON position, and wait for at least 10 seconds.

(b)

Using the hand–held tester, check the DTCs of the occupant classification ECU (see page 

DI–1147

).

OK:

DTC is not output of the occupant classification ECU.

NG

Go to inspection procedure of DTC output
(see page 

DI–1155

).

OK

2

Check DTC (airbag sensor assembly).

CHECK:
(a)

Turn the ignition switch to the ON position, and wait for at
least 60 seconds.

(b)

Clear the DTCs stored in memory (see page 

DI–1147

).

HINT:
First clear DTCs stored in the occupant classification ECU and
then in the airbag sensor assembly.
(c)

Turn the ignition switch to the LOCK position.

(d)

Turn the ignition switch to the ON position, and wait for at
least 60 seconds.

(e)

Check the DTCs (see page 

DI–1147

).

OK:

DTC B1650/32 is not output.

HINT:
Codes other than DTC B1650/32 may be output at this time, but
they are not related to this check.

NG

Go to step 3.

OK

From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page 

DI–1137

).

DI–1206

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1400

3

Check connection of connectors.

PREPARATION:
(a)

Turn the ignition switch to the LOCK position.

(b)

Disconnect the negative (–) terminal cable from the battery, and wait for at least 90 seconds.

CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and the occupant classifi-
cation ECU.
OK:

The connectors are connected securely.

NG

Connect connectors, then go to step 1.

OK

4

Prepare for inspection.

CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a)

Disconnect the connectors from the airbag sensor assembly.

(b)

Disconnect the connectors from the steering wheel pad.

(c)

Disconnect the connectors from the front passenger airbag assembly.

(d)

w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.

(e)

w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.

(f)

Disconnect the connectors from the front seat outer belt LH and RH.

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