Toyota Sequoia (2005). Manual - part 407

H01017

H23588

Side Squib RH

Airbag 
Sensor 
Assembly

C

D

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1423

1617

8

Check airbag sensor assembly.

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 B1820 is not output.

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

NG

Replace airbag sensor assembly
(see page 

RS–82

).

OK

Go to step 10.

H44044

H01020

H24018

Airbag
Sensor
Assembly

Side Squib RH

SFR+

SFR–

Floor Wire

D

Service Wire

C

S18

DI–1424

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1618

9

Check airbag sensor assembly.

PREPARATION:
(a)

From the step 5:
Turn the ignition switch to the LOCK position.

(b)

From the step 5:
Disconnect the negative (–) terminal cable from the bat-
tery, and wait for at least 90 seconds.

(c)

Connect the connectors to the airbag sensor assembly.

(d)

Using a service wire, connect S18–1 (SFR+) and S18–2
(SFR–) of the connector ”C”.

NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
(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 B1821, B1822 or B1823 is not output.

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

NG

Replace airbag sensor assembly
(see page 

RS–82

).

OK

H23966

Side Squib RH

Airbag 
Sensor 
Assembly

C

D

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1425

1619

10

Check side airbag assembly RH (side squib RH).

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 service wire from connector ”C”.

(d)

Connect the connector to the side airbag assembly RH.

(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 B1820, B1821, B1822 or B1823 is not output.

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

NG 

Replace side airbag assembly RH
(see page 

RS–46

, 

RS–61

).

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–1426

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1620

DTC

B1825/56 Short in Side Squib (LH) Circuit

DTC

B1826/56 Open in Side Squib (LH) Circuit

DTC

B1827/56 Short in Side Squib (LH) Circuit (to Ground)

DTC

B1828/56 Short in Side Squib (LH) Circuit (to B+)

CIRCUIT DESCRIPTION

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

DTC No.

DTC Detection Condition

Trouble Area

B1825/56

The airbag sensor assembly receives a line short circuit

signal 5 times in the side squib LH circuit during primary

check.

Side squib LH malfunction

Airbag sensor assembly malfunction

Side airbag assembly LH (Side squib LH)

Airbag sensor assembly

Floor wire No. 2

B1826/56

The airbag sensor assembly receives an open circuit sig-

nal in the side squib LH circuit for 2 seconds.

Side squib LH malfunction

Airbag sensor assembly malfunction

Side airbag assembly LH (Side squib LH)

Airbag sensor assembly

Floor wire No. 2

B1827/56

The airbag sensor assembly receives a short circuit to

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

Side squib LH malfunction

Airbag sensor assembly malfunction

Side airbag assembly LH (Side squib LH)

Airbag sensor assembly

Floor wire No. 2

B1828/56

The airbag sensor assembly receives a short to B+ circuit

signal in the side squib LH circuit for 0.5 seconds.

Side squib LH malfunction

Airbag sensor assembly malfunction

Side airbag assembly LH (Side squib LH)

Airbag sensor assembly

Floor wire No. 2

DIDHN–01