2001 TOYOTA SEQUOIA O2 sensor

H01010H23951H24028H24556
Cowl Wire
Airbag
Sensor
Assembly
Integration Control
and PanelA
B
C D
P±AB
PAONP±ABPAON
Service WireA20
I19
DI±1234
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1428 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check cowl wire (open).
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) Using a service wire, connect I19±17 (P±AB) and I19±16
(PAON) of connector ºCº.
NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±17 (P±AB) ±
A20±23 (PAON)AlwaysBelow 1 W
NG Repair or replace cowl wire.
OK

H01015G27651H23985
Cowl Wire
Airbag
Sensor
Assembly Integration
Control and Panel
A
B
C D
P±ABPAON
A20
H23951
P±ABPAON
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1235
1429 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check cowl wire (short to B+).
PREPARATION:
(a) Disconnect the service wire from connector ºCº.
(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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±17 (P±AB) ±
Body groundIgnition switch ONBelow 1 V
A20±23 (PAON) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace cowl wire.
OK
11 Check cowl wire (airbag sensor assembly ± body ground).
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.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±17 (P±AB) ±
Body groundAlways1 MW or higher
A20±23 (PAON) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK

H10600H01012H01069H24008
Airbag
Sensor
Assembly Integration
Control
and Panel
DLC3
TC CG
DTC B1660/43
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1237
1431 Author: Date:
2005 SEQUOIA (RM1146U)
13 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 connectors to the airbag sensor assembly.
(d) 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 B1660/43 is not output.
HINT:
Codes other than DTC B1660/43 may be output at this time, but
they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
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).

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

H23995
RMIL A2020
IM1B±R I18
Ignition SW
Combination Meter
BatteryIG2 A2021
E1 A2025
E2 A2026 B
W±B
W±B B±R
IG2 AM26 5
W±RRSCA OFFB±R
C5 40
C612C624
1H11
1C2
1A3 IGN1
1D6
1F9
1F101A6
1A8 Instrument Panel J/B
Engine Room J/B 1C3
1J7
2C1
2D1AM2BR
W±B
W±B
J8
J/C A
A F10
Fusible Link Block 4
5
BBB±O
IEAirbag Sensor
Assembly
1
W±R
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1239
1433 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1240
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1434 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check RSCA OFF indicator condition.
CHECK:
Turn the ignition switch to the ON position, check the RSCA OFF indicator condition.
RESULT:
The RSCA OFF indicator does not come on when the RSCA OFF switch is
operate (remains off).A
The RSCA OFF indicator remains on when the RSCA OFF switch is not
operate (remains on).B
B Go to step 7.
A
2 Prepare for inspection.
PREPARATION:
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a) Turn the ignition switch LOCK position.
(b) Disconnect the negative (±) terminal cable from the battery, and wait for at least 90 seconds.
(c) Disconnect the connectors from the airbag sensor assembly.
(d) Disconnect the connectors from the steering wheel pad.
(e) Disconnect the connectors from the front passenger airbag assembly.
(f) w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.
(g) w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.
(h) Disconnect the connectors from the front seat outer belt LH and RH.
NEXT

H01015G27651H23985
RMILAirbag
Sensor
Assembly A Cowl Wire Combination
Meter
A20B C D
DI±1242
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1436 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check cowl wire (short to B+).
PREPARATION:
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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±20 (RMIL) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace cowl wire.
OK

H10600 H01012H01070H24042
Combination
Meter
Airbag
Sensor
Assembly
DTC B1661/44 DLC3
CG TC
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1243
1437 Author: Date:
2005 SEQUOIA (RM1146U)
6 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 connectors to the airbag sensor assembly
and the combination meter.
(d) 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 B1661/44 is not output.
HINT:
Codes other than DTC B1661/44 may be output at this time, but
they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
HINT:
If the DTC B1661/44 is output after replacing the airbag sensor
assembly, there may be trouble in the combination meter.
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).