Toyota Sequoia (2005). Manual - part 415

H01017

H23472

Airbag 
Sensor 
Assembly

Curtain Shield 
Airbag LH Squib

D

C

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1455

1649

10

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 B1835 is not output.

HINT:
Codes other than DTC B1835 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 12.

H01017

H23982

H23992

Airbag 
Sensor 
Assembly

ICL+

ICL–

D C

Service Wire

Curtain Shield 
Airbag LH Squib

C11

DI–1456

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1650

11

Check airbag sensor assembly.

PREPARATION:
(a)

From the step 6:
Turn the ignition switch to the LOCK position.

(b)

From the step 6:
Disconnect the negative (–) terminal cable from the bat-
tery, and wait for at least 90 seconds.

(c)

Using a service wire, connect C11–1 (ICL+) and C11–2
(ICL–) of the connector ”C”.

NOTICE:

Twist the end of the service wire in order to insert it
into the connector.

Do not forcibly insert the twisted service wire into the
terminals of the connector when connecting.

(d)

Connect the connectors to the airbag sensor assembly.

(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 B1836, B1837 or B1838 is not output.

HINT:
Codes other than DTC B1836, B1837 and B1838 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

H01018

H23474

Curtain Shield 
Airbag LH Squib

Airbag 
Sensor 
Assembly

DC

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1457

1651

12

Check curtain shield airbag assembly LH (curtain shield airbag LH squib).

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 curtain shield airbag as-
sembly LH.

(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 B1835, B1836, B1837 or B1838 is not output.

HINT:
Codes other than DTC B1835, B1836, B1837 and B1838 may
be output at this time, but they are not related to this check.

NG 

Replace curtain shield airbag assembly LH
(see page 

RS–71

).

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–1458

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1652

DTC

B1900/73 Short in P/T Squib (RH) Circuit

DTC

B1901/73 Open in P/T Squib (RH) Circuit

DTC

B1902/73 Short in P/T Squib (RH) Circuit (to Ground)

DTC

B1903/73 Short in P/T Squib (RH) Circuit (to B+)

CIRCUIT DESCRIPTION

The P/T squib RH circuit consists of the airbag sensor assembly and the front seat outer belt RH.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the P/T squib RH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1900/73

The airbag sensor assembly receives a line short circuit

signal 5 times in the P/T squib RH circuit during primary

check.

P/T squib RH malfunction

Airbag sensor assembly malfunction

Front seat outer belt RH (P/T squib RH)

Airbag sensor assembly

Floor wire

B1901/73

The airbag sensor assembly receives an open circuit sig-

nal in the P/T squib RH circuit for 2 seconds.

P/T squib RH malfunction

Airbag sensor assembly malfunction

Front seat outer belt RH (P/T squib RH)

Airbag sensor assembly

Floor wire

B1902/73

The airbag sensor assembly receives a short circuit to

ground signal in the P/T squib RH circuit for 0.5 seconds.

P/T squib RH malfunction

Airbag sensor assembly malfunction

Front seat outer belt RH (P/T squib RH)

Airbag sensor assembly

Floor wire

B1903/73

The airbag sensor assembly receives a short to B+ circuit

signal in the P/T squib RH circuit for 0.5 seconds.

P/T squib RH malfunction

Airbag sensor assembly malfunction

Front seat outer belt RH (P/T squib RH)

Airbag sensor assembly

Floor wire

DIDHQ–01