Toyota Sequoia (2005). Manual - part 418

H01020

H43107

H23605

P/T Squib RH

PR–

PR+

Floor Wire

Service Wire

C

D

Airbag
Sensor
Assembly

P11

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1467

1661

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)

Connect the connectors to the airbag sensor assembly.

(d)

Using a service wire, connect P11–1 (PR+) and P11–2
(PR–) of 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.

(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 B1901, B1902 or B1903 is not output.

HINT:
Codes other than DTC B1901, B1902 and B1903 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

Airbag 
Sensor 
Assembly

C

D

P/T Squib RH

DI–1468

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1662

12

Check front seat outer belt RH (P/T squib RH).

PREPARATION:
(a)

Turn the ignition switch to the LOCK position.

(b)

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

(c)

From the step 11:
Disconnect the service wire from connector ”C”.

(d)

Connect the connector to the front seat outer belt 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 B1900, B1901, B1902 or B1903 is not output.

HINT:
Codes other than DTC B1900, B1901, B1902 and B1903 may
be output at this time, but they are not related to this check.

NG

Replace front seat outer belt RH
(see page 

BO–163

).

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

).

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1469

1663

DTC

B1905/74 Short in P/T Squib (LH) Circuit

DTC

B1906/74 Open in P/T Squib (LH) Circuit

DTC

B1907/74 Short in P/T Squib (LH) Circuit (to Ground)

DTC

B1908/74 Short in P/T Squib (LH) Circuit (to B+)

CIRCUIT DESCRIPTION

The P/T squib LH circuit consists of the airbag sensor assembly and the front seat outer belt LH.
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 LH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1905/74

The airbag sensor assembly receives a line short circuit

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

check.

P/T squib LH malfunction

Airbag sensor assembly malfunction

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

Airbag sensor assembly

Floor wire No. 2

B1906/74

The airbag sensor assembly receives an open circuit sig-

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

P/T squib LH malfunction

Airbag sensor assembly malfunction

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

Airbag sensor assembly

Floor wire No. 2

B1907/74

The airbag sensor assembly receives a short circuit to

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

P/T squib LH malfunction

Airbag sensor assembly malfunction

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

Airbag sensor assembly

Floor wire No. 2

B1908/74

The airbag sensor assembly receives a short to B+  circuit

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

P/T squib LH malfunction

Airbag sensor assembly malfunction

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

Airbag sensor assembly

Floor wire No. 2

DIDHR–01

H01454

P10
P/T Squib LH

Airbag Sensor Assembly

A19

5

PL+

Y–B

1

2

Y

A19

6

PL–

DI–1470

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1664

WIRING DIAGRAM