2001 TOYOTA SEQUOIA Tensioner

H24635
Rollover Detection:
Side Collision and Rollover Detection:(a)
(b)
Airbag Sensor Assembly
Roll Rate Sensor 1
Roll Rate Sensor 2
Lateral Deceleration Sensor
Curtain Shield Airbag
Assembly (LH and RH)
Seat Belt Pretensioner
(LH and RH)
(c) (b)
Airbag Sensor Assembly
Roll Rate Sensor 1
Roll Rate Sensor 2
Lateral Deceleration Sensor
Curtain Shield Airbag
Sensor Assembly
Side Airbag Sensor
Assembly (
)Curtain Shield Airbag
Assembly (LH and RH)
Seat Belt Pretensioner
(LH and RH)Side Airbag of Collision
Side (
)
Activate depending on the
condition of the collision.
: DI±1124
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1318 Author: Date:
2005 SEQUOIA (RM1146U)
(d) w/ Side and curtain shield airbag:
Roll sensing of curtain shield airbag control.
(1) The airbag sensor assembly contains a roll rate sensor and roll rate sensor (that determine the
inclination angle the vehicle) and a lateral deceleration sensor (that determine the lateral force
that is applied to the vehicle). These sensors detect the vehicle's roll angle, rotational speed, and
lateral acceleration speed.
(2) Based on the information obtained from sensors, the airbag sensor assembly makes an overall
judgment of the vehicle's roll angle rotational speed, and lateral acceleration speed. If the airbag
sensor determines that the vehicle has rolled over due to cause other than the side collision, it
deploys the right and left curtain shield airbags and the front right and left seat belt pretensioners.
(3) This system provides a roll sensing of curtain shield airbags cutoff switch (RSCA OFF switch)
on the driver side of the instrument panel with which the driver can stop the operation of the func-
tion.
(4) By operating the RSCA OFF switch and while the roll sensing of the curtain shield airbag control
is OFF, and when the airbag sensor assembly judges to operate the side and curtain shield air-
bag system in the event of side collision, it is no need prohibit this operation.

H23984
6 seconds
Ignition Switch
SRS Warning
Light (*1)
SRS Warning
Light (*2)
*1: SRS airbag system is normal
*2: SRS airbag system has trouble ON
OFF
ON
OFF
ON
OFF
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1139
1333 Author: Date:
2005 SEQUOIA (RM1146U)
3. FUNCTION OF SRS WARNING LIGHT
(a) Primary check.
Turn the ignition switch to the LOCK position. Wait for at least 2 seconds, then turn the ignition switch
to the ON position. The SRS warning light comes on for approximately 6 seconds and the SRS airbag
system diagnosis (including the seat belt pretensioner and occupant classification system) is per-
formed.
HINT:
If trouble is detected during the primary check, the SRS warning light remains on even after the primary
check period (for approximately 6 seconds) has elapsed.
(b) Constant check.
After the primary check, the airbag sensor assembly constantly monitors the SRS airbag system for
trouble.
HINT:
If trouble is detected during the constant check, the airbag sensor assembly functions as follows:

The SRS warning light comes on.

The SRS warning light goes off, and then comes on. This blinking pattern indicates the source voltage
drop. The SRS warning light goes off 10 seconds after the source voltage returns to normal.

H02750
O6
Occupant Classification ECU
FSR+
BL13
WW
A2116Airbag Sensor Assembly
A2124
B B
BL15
FSR±FSR+
FSR± 8
4 DI±1204
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1398 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1650/32 Occupant Classification System
Malfunction
CIRCUIT DESCRIPTION
The occupant classification system circuit consists of the airbag sensor assembly and the occupant classifi-
cation system.
If the airbag sensor assembly receives signals from the occupant classification ECU, it determines whether
or not the front passenger airbag assembly, side airbag assembly RH and seat belt pretensioner RH should
be operated.
DTC B1650/32 is recorded when a malfunction is detected in the occupant classification system circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1650/32

Occupant classification system malfunction

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 occupant classifi-
cation system circuit for 2 seconds.

Airbag sensor assembly malfunction

Occupant classification system

Airbag sensor assembly

Floor wire

Seat wire No. 1
WIRING DIAGRAM
DIDGY±01

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1227
1421 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1660/43 Passenger Airbag ON/OFF Indicator
Malfunction
CIRCUIT DESCRIPTION
The passenger airbag ON/OFF indicator circuit consists of the airbag sensor assembly and the integration
control and panel.
This circuit indicates the operation condition of the front passenger airbag assembly, the side airbag assem-
bly RH and seat belt pretensioner RH.
DTC B1660/43 is recorded when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1660/43

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 passenger airbag
ON/OFF indicator circuit for 2 seconds.

Passenger airbag ON/OFF indicator malfunction

Airbag sensor assembly malfunction

Integration control and panel
(Passenger airbag ON/OFF indicator)

Airbag sensor assembly

Cowl wire
DIDH1±01

DI±1238
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1432 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1661/44 Roll Over Cut Off Indicator Malfunction
CIRCUIT DESCRIPTION
The RSCA OFF switch is a mechanism that operates both right and left side of the curtain shield airbag as-
sembly and the seat belt pretensioners when the airbag sensor assembly detects a roll±over.
The RSCA OFF indictor is installed in the combination meter.
As operating the RSCA OFF switch, the indicator comes on to inform the driver that the roll±over detection
system is not working.
The initial setting of the roll±over detection system is on. It automatically operates every time the ignition
switch is turned on.
DTC No.DTC Detecting ConditionTrouble Area
B1661/44

The airbag sensor assembly receives an open circuit sig-
nal, a short circuit to ground signal or a short circuit to B+
signal in the roll over cut off indicator circuit for 2 seconds.

RSCA OFF indicator malfunction

Airbag sensor assembly malfunction

Combination meter (RSCA OFF indicator)

Airbag sensor assembly

Cowl wire
DIDH2±01

A23302
RH No.3 Timing Belt Cover
No.2 Timing
Belt Cover
LH No.3 Timing Belt Cover Drive Belt Idler Pulley
Camshaft Position
Sensor ConnectorCover Plate
Oil Cooler Pipe Engine Wire
7.5 (76, 66 in.´lbf)
16 (160, 12)
7.5 (76, 66 in.´lbf)
N´m (kgf´cm, ft´lbf) : Specified torque
Wire Grommet
39 (400, 29)
A23303
Timing BeltLH Camshaft Timing Pulley
Timing Belt Tensioner
Dust Boot
245 (2,500, 181)
16 (160, 12)
32 (330, 24)
RH Camshaft Timing Pulley
26 (270, 19)Fan Bracket
N´m (kgf´cm, ft´lbf) : Specified torque
8.1 (83, 72 in.´lbf)
EM±14
± ENGINE MECHANICALTIMING BELT
2593 Author: Date:
2005 SEQUOIA (RM1146U)

A23304
Generator WireDrive Belt Tensioner
No.1 Timing Belt Cover Generator
Crankshaft Pulley
39 (400, 29)
No.1 Idler Pulley
Timing Belt
Plate Washer
Crankshaft Timing Pulley
Timing Belt Cover Spacer No.2 Idler Pulley
Timing Belt Guide
(Crankshaft Angle Sensor Plate)Gasket
34.5 (350, 25)
34.5 (350, 25)

N´m (kgf´cm, ft´lbf) : Specified torque

Precoated part
26 (265, 19)
39 (400, 29)
15.5 (158, 11)
± ENGINE MECHANICALTIMING BELT
EM±15
2594 Author: Date:
2005 SEQUOIA (RM1146U)

A23307Turn
A23308
A14391
Approx. 50°Idler
Pulley
Bolt
Timing
Mark
Crankshaft
Pulley Bolt
Turn
A23309
EM±18
± ENGINE MECHANICALTIMING BELT
2597 Author: Date:
2005 SEQUOIA (RM1146U)
16. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Turn the crankshaft pulley and align its groove with timing
mark º0º of the No.1 timing belt cover.
(b) Check that the timing marks of the camshaft timing pul-
leys and timing belt rear plates are aligned.
If not, turn the crankshaft 1 revolution (360°).
(c) Turn the crankshaft pulley approx. 50° clockwise, and
align the timing mark of the crankshaft pulley with the cen-
ters of the crankshaft pulley bolt and the No.2 timing belt
idler pulley bolt.
NOTICE:
If the timing belt is disengaged, having the crankshaft
pulley at the wrong angle can cause the piston head and
valve head to come into contact with each other when you
remove the camshaft timing pulley (step 15), causing dam-
age. So always set the crankshaft pulley at the correct
angle.
(d) Remove the crankshaft pulley bolt.
NOTICE:
Do not turn the crankshaft pulley.
17. REMOVE TIMING BELT TENSIONER
HINT:

When re±using the timing belt:
If the installation marks have disappeared, before remove
the timing belt, place 2 new installation marks on the tim-
ing belt to match the timing marks of the camshaft timing
pulleys.