Toyota Sequoia (2005). Manual - part 344

H02750

Airbag Sensor Assembly

A20 +SL

30

IA3

1

IA3

2

A20

28

A11
Front Airbag Sensor LH

2

1

–SL

W

W

B

B

+SL

–SL

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1171

1365

DTC

B1615/14 Front Airbag Sensor LH Malfunction

CIRCUIT DESCRIPTION

The front airbag sensor LH consists of the diagnosis circuit, the frontal deceleration sensor, etc. 
If the airbag sensor assembly receives signals from the frontal deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1615/14 is recorded when a malfunction is detected in the front airbag sensor LH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1615/14

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 front airbag sensor

LH circuit for 2 seconds.

Front airbag sensor LH malfunction

Airbag sensor assembly malfunction

Front airbag sensor LH

Airbag sensor assembly

Cowl wire

Engine room main wire

WIRING DIAGRAM

DIDGT–01

H10600

H02757

W02044

H23570

CG

TC

DTC B1615/14

DLC3

Front Airbag 
Sensor LH

Airbag 
Sensor 
Assembly

DI–1172

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1366

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 B1615/14 is not output.

HINT:
Codes other than DTC B1615/14 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

H08016 G27651

H23623

Front Airbag 
Sensor LH

Airbag 
Sensor 
Assembly

+SL

–SL

A

B

D

F

E

C

C

Service Wire

+SL

–SL

A20

A11

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1173

1367

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 airbag sensor
LH.
OK:

The connectors are connected securely.

NG

Connect connectors, then go to step 1.

OK

3

Check front airbag sensor LH circuit (open).

PREPARATION:
(a)

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

(b)

Using a service wire, connect A11–2 (+SL) and A11–1
(–SL) of connector ”E”.

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

A20–30 (+SL) – 

A20–28 (–SL)

Always

Below 1 

Ω

NG

Go to step 8.

OK

H03355

G27651

H23624

Front Airbag
Sensor LH

Airbag
Sensor
Assembly

–SL

+SL

A

B

D

E

F

C

A20

H03355

G27651

H23624

Front Airbag
Sensor LH

Airbag
Sensor
Assembly

–SL

+SL

A

B

D

E

F

C

A20

DI–1174

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1368

4

Check front airbag sensor LH circuit (short).

PREPARATION:
Disconnect the service wire from connector ”E”.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:

Tester Connection

Condition

Specified Condition

A20–30 (+SL) – 

A20–28 (–SL)

Always

1 M

Ω 

or higher

NG

Go to step 9.

OK

5

Check front airbag sensor LH circuit (short to B+).

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.

(b)

Measure the voltage according to the value(s) in the table
below.

OK:

Tester Connection

Condition

Specified Condition

A20–30 (+SL) – 

Body ground

Ignition switch ON

Below 1 V

A20–28 (–SL) – 

Body ground

Ignition switch ON

Below 1 V

NG

Go to step 10.

OK