Toyota Sequoia (2005). Manual - part 356

H10600

H01007

H43920

H23364

DLC3

CG

TC

DTC B1653/35

Seat
Position
Airbag
Sensor
Assembly

Airbag 
Sensor 
Assembly

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1219

1413

9

Check airbag sensor assembly.

PREPARATION:
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 for 60 seconds.

(e)

Check the DTCs (see page 

DI–1147

).

OK:

DTC B1653/35 is not output.

HINT:
Codes other than DTC B1653/35 may be output at this time, but
they are not related to this check.

NG

Replace airbag sensor assembly
(see page 

RS–82

).

OK

END

H23244

Airbag Sensor Assembly

A19

10

LBE+

G

4

B18 (*1)
Buckle SW LH
Seat Position Airbag Sensor Assembly

*1: The connectors of the seat position airbag sensor assembly and the
front seat inner belt LH (buckle switch LH) are in common use.

Buckle
SW

6

R

A19

18

LBE–

DI–1220

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1414

DTC

B1656/38 Seat Belt Buckle Switch (LH) Malfunction

CIRCUIT DESCRIPTION

The seat belt buckle switch LH circuit consists of the airbag sensor assembly and the front seat inner belt
LH.
DTC B1656/38 is recorded when a malfunction is detected in the seat belt buckle switch LH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1656/38

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 seat belt buckle

switch LH circuit for 2 seconds.

Front seat inner belt LH malfunction

Airbag sensor assembly malfunction

Front seat inner belt LH

Airbag sensor assembly

Floor wire No. 2

WIRING DIAGRAM

DIDH0–01

C84216

H10600 C92968

H24657

CG

TC

DTC B1656/38

DLC3

Airbag
Sensor
Assembly

Front Seat 
Inner Belt LH

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1221

1415

INSPECTION PROCEDURE

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

(c)

Disconnect the connectors from the airbag sensor assembly.

(d)

Disconnect the connectors from the steering wheel pad.

(e)

Disconnect the connectors from the front passenger airbag assembly.

(f)

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

(g)

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

(h)

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

1

Check DTC.

PREPARATION:
(a)

Connect the connectors to the airbag sensor assembly.

(b)

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 B1656/38 is not output.

HINT:
Codes other than DTC B1656/38 may be output at this time, but
they are not related to this check.

NG

Go to step 2.

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

).

H03353

G27651

H24026

H24551

Airbag 

Sensor 

Assembly

LBE+

LBE–

Front Seat 
Inner Belt LH

B

C

D

A

Service Wire

Floor Wire No. 2

A19

B18

4

6

DI–1222

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1416

2

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 front seat inner
belt LH.
OK:

The connectors are connected securely.

NG

Connect connectors, then go to step 1.

OK

3

Check floor wire No. 2 (open).

PREPARATION:
(a)

Disconnect the connectors from the airbag sensor as-
sembly and the front seat inner belt LH.

(b)

Using a service wire, connect B18–4 and B18–6 of con-
nector ”C”.

NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

A19–10 (LBE+) – 

A19–18 (LBE–)

Always

Below 1 

Ω

NG

Repair or replace floor wire No. 2.

OK