Toyota Sequoia (2005). Manual - part 405

H01024

H23360

Airbag
Sensor
Assembly

P Squib
(Dual stage – 
2nd step)

D C

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1415

1609

10

Check front passenger airbag assembly (P squib, dual stage – 2nd step).

PREPARATION:
(a)

Turn the ignition switch to the LOCK position.

(b)

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

(c)

From the step 9:
Disconnect the SST from connector ”C”.

(d)

Connect the connector to the front passenger airbag as-
sembly.

(e)

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 B1815, B1816, B1817 or B1818 is not output.

HINT:
Codes other than DTC B1815, B1816, B1817 and B1818 may
be output at this time, but they are not related to this check.

NG 

Replace front passenger airbag assembly
(see page 

RS–33

).

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

).

HINT:

Perform the simulation method by selecting the check mode with the hand–held tester (see page 

DI–1151

).

After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page 

DI–1151

).

DI–1416

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1610

DTC

B1820/55 Short in Side Squib (RH) Circuit

DTC

B1821/55 Open in Side Squib (RH) Circuit

DTC

B1822/55 Short in Side Squib (RH) Circuit (to Ground)

DTC

B1823/55 Short in Side Squib (RH) Circuit (to B+)

CIRCUIT DESCRIPTION

The side squib RH circuit consists of the airbag sensor assembly and the side airbag assembly RH.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the side squib RH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1820/55

The airbag sensor assembly receives a line short circuit

signal 5 times in the side squib RH circuit during primary

check.

Side squib RH malfunction

Airbag sensor assembly malfunction

Side airbag assembly RH (Side squib RH)

Airbag sensor assembly

Floor wire

B1821/55

The airbag sensor assembly receives an open circuit sig-

nal in the side squib RH circuit for 2 seconds.

Side squib RH malfunction

Airbag sensor assembly malfunction

Side airbag assembly RH (Side squib RH)

Airbag sensor assembly

Floor wire

B1822/55

The airbag sensor assembly receives a short circuit to

ground signal in the side squib RH circuit for 0.5 seconds.

Side squib RH malfunction

Airbag sensor assembly malfunction

Side airbag assembly RH (Side squib RH)

Airbag sensor assembly

Floor wire

B1823/55

The airbag sensor assembly receives a short to B+ circuit

signal in the side squib RH circuit for 0.5 seconds.

Side squib RH malfunction

Airbag sensor assembly malfunction

Side airbag assembly RH (Side squib RH)

Airbag sensor assembly

Floor wire

DIDHM–01

H01454

S18
Side Squib RH

Airbag Sensor Assembly

A21

8

SFR+

Y–B

1

2

Y

A21

7

SFR–

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1417

1611

WIRING DIAGRAM

DI–1418

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1612

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.

CHECK:
(a)

Proceed to each step according to how to read DTC.
(1)

If using the hand–held tester (read the 5–digit of DTC):
Using the hand–held tester, check the DTCs (see page 

DI–1147

).

RESULT:

DTC B1820 is output.

A

DTC B1821 is output.

B

DTC B1822 is output.

C

DTC B1823 is output.

D

(2)

If not using the hand–held tester (read the 2–digit of DTC):
Check the DTCs (see page 

DI–1147

).

RESULT:

DTC 55 is output.

E

HINT:
Codes other than DTC B1820, B1821, B1822, B1823 and DTC 55 may be output at this time, but they are
not related to this check.

B

Go to step 3.

C

Go to step 4.

D

Go to step 5.

E

Go to step 6.

A