Toyota Sequoia (2005). Manual - part 341

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1159

1353

Normal

(

DI–1480

)

Source voltage drop

Battery

Airbag sensor assembly

ON

Normal

System normal

OFF

*1: w/ Side and curtain shield airbag
2.

DTCS FOR OCCUPANT CLASSIFICATION SYSTEM

If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below
(Proceed to the page listed for that circuit).
HINT:

When the DTC B1650/32 is detected as a result of troubleshooting for the Supplemental Restraint Sys-
tem, perform troubleshooting for the occupant classification system as shown in the chart below.

Use the hand–held tester to check/clear the DTC of the occupant classification ECU, otherwise the
DTC cannot be check/clear.

DTC No.

(See Page)

Detection Item

Trouble Area

Passenger Airbag

ON/OFF Indicator

B1771

(

DI–1251

)

Passenger side buckle switch circuit

malfunction

Front seat inner belt RH

Occupant classification ECU

Seat wire No. 1

ON

B1780

(

DI–1260

)

Occupant classification sensor front

LH circuit malfunction

Front seat assembly RH (Occupant classification sensor

front LH)

Occupant classification ECU

Seat wire No. 1

ON

B1781

(

DI–1270

)

Occupant classification sensor front

RH circuit malfunction

Front seat assembly RH (Occupant classification sensor

front RH)

Occupant classification ECU

Seat wire No. 1

ON

B1782

(

DI–1280

)

Occupant classification sensor rear

LH circuit malfunction

Front seat assembly RH (Occupant classification sensor

rear LH)

Occupant classification ECU

Seat wire No. 1

ON

B1783

(

DI–1290

)

Occupant classification sensor rear

RH circuit malfunction

Front seat assembly RH (Occupant classification sensor

rear RH)

Occupant classification ECU

Seat wire No. 1

ON

B1785

(

DI–1300

)

Occupant classification sensor front

LH collision detection

Front seat assembly RH (Occupant classification sensor

front LH)

Occupant classification ECU

ON

B1786

(

DI–1305

)

Occupant classification sensor front

RH collision detection

Front seat assembly RH (Occupant classification sensor

front RH)

Occupant classification ECU

ON

B1787

(

DI–1310

)

Occupant classification sensor rear

LH collision detection

Front seat assembly RH (Occupant classification sensor

rear LH)

Occupant classification ECU

ON

B1788

(

DI–1315

)

Occupant classification sensor rear

RH collision detection

Front seat assembly RH (Occupant classification sensor

rear RH)

Occupant classification ECU

ON

B1790

(

DI–1320

)

Airbag sensor assembly communica-

tion circuit malfunction

Occupant classification ECU

Airbag sensor assembly

Floor wire

Seat wire No. 1

ON

B1793

(

DI–1332

)

Occupant classification sensor power

supply circuit malfunction

Occupant classification ECU

Front seat assembly RH (Occupant classification sensors)

Seat wire No. 1

ON

DI–1160

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1354

B1794

(

DI–1342

)

Occupant classification ECU battery

positive line open

Battery

ECU–B Fuse

Floor wire

Seat wire No. 1

Occupant classification ECU

ON

B1795

(

DI–1348

)

Occupant classification ECU circuit

malfunction

Occupant classification ECU

Seat wire No. 1

Front seat inner belt RH

ON

B1796

(

DI–1350

)

Sleep operation failure of occupant

classification ECU

Occupant classification ECU

ON

DIDGR–01

H10600

H23564

DTC B1000/31

DLC3

TC

CG

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

DI–1161

1355

CIRCUIT INSPECTION

DTC

B1000/31 Airbag Sensor Assembly Malfunction

CIRCUIT DESCRIPTION

The airbag sensor assembly consists of the airbag sensor, the safing sensor, the drive circuit, the diagnostic
circuit, ignition control, etc. 
If the airbag sensor assembly receives signals from the airbag sensor, it determines whether or not the SRS
should be activated. 
DTC B1000/31 is recorded when a malfunction is detected in the airbag sensor assembly.

DTC No.

DTC Detection Condition

Trouble Area

B1000/31

Airbag sensor assembly malfunction

Airbag sensor assembly

HINT:
When a trouble code is displayed simultaneously with B1000/31, repair the malfunction indicated by this
code (except B1000/31) first.

INSPECTION PROCEDURE

1

Check airbag sensor assembly.

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)

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 B1000/31 is not output.

NG

Replace airbag sensor assembly
(see page 

RS–84

).

OK

Using simulation method, reproduce malfunction symptoms (see page 

IN–24

).

H02750

Airbag Sensor Assembly

A20 +SR

29

IL3

1

IL3

2

A20

27

A12
Front Airbag Sensor RH

2

1

–SR

W

W

B

B

+SR

–SR

DI–1162

–

DIAGNOSTICS

SUPPLEMENTAL RESTRAINT SYSTEM

1356

DTC

B1610/13 Front Airbag Sensor RH Malfunction

CIRCUIT DESCRIPTION

The front airbag sensor RH 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 B1610/13 is recorded when a malfunction is detected in the front airbag sensor RH circuit.

DTC No.

DTC Detection Condition

Trouble Area

B1610/13

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

RH circuit for 2 seconds.

Front airbag sensor RH malfunction

Airbag sensor assembly malfunction

Front airbag sensor RH

Airbag sensor assembly

Cowl wire

Engine room main wire

WIRING DIAGRAM

DIDGS–01