2001 TOYOTA SEQUOIA O2 sensor

DIDGR±01
H10600H23564
DTC B1000/31
DLC3
TC CG
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1161
1355 Author: Date:
2005 SEQUOIA (RM1146U)
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 ConditionTrouble 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
IL31
IL32
A2027 A12
Front Airbag Sensor RH
2
1±SR W
W
BB +SR
±SR DI±1162
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1356 Author: Date:
2005 SEQUOIA (RM1146U)
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 ConditionTrouble 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

H02757H10600H40103H23566
CG
TCDTC B1610/13
DLC3 Front Airbag
Sensor RHAirbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1163
1357 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(a) Turn the ignition switch to the 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.
1 Check DTC.
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 B1610/13 is not output.
HINT:
Codes other than DTC B1610/13 may be output at this time, but
they are not related to this check.
NG Go to step 2.
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).

H03353H08016G27651H23623
Front Airbag
Sensor RHAirbag
Sensor
Assembly
+SR
±SR
A
B D F
E
C C
Service Wire
+SR ±SR
A20A12
DI±1164
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1358 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check connection of connectors.
PREPARATION:
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (±) terminal cable from the battery, and wait for at least 90 seconds.
CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and the front airbag sensor
RH.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check front airbag sensor RH circuit (open).
PREPARATION:
(a) Disconnect the connectors from the airbag sensor as-
sembly and the front airbag sensor RH.
(b) Using a service wire, connect A12±2 (+SR) and A12±1
(±SR) of connector ºEº.
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±29 (+SR) ±
A20±27 (±SR)AlwaysBelow 1 W
NG Go to step 8.
OK

H03355G27651H23624
Front Airbag
Sensor RHAirbag
Sensor
Assembly
±SR +SR
A
B D E F
C
A20
H03355G27651H23624
Front Airbag
Sensor RHAirbag
Sensor
Assembly
±SR +SR
A
B D E F
C
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1165
1359 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check front airbag sensor RH circuit (short).
PREPARATION:
Disconnect the service wire from connector ºEº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±29 (+SR) ±
A20±27 (±SR)Always1 MW or higher
NG Go to step 9.
OK
5 Check front airbag sensor RH circuit (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±29 (+SR) ±
Body groundIgnition switch ONBelow 1 V
A20±27 (±SR) ±
Body groundIgnition switch ONBelow 1 V
NG Go to step 10.
OK

H03355G27651H23624
Front Airbag
Sensor RHAirbag
Sensor
Assembly
±SR +SR
A
B D E F
C
A20
DI±1166
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1360 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check front airbag sensor RH circuit (short to 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±29 (+SR) ±
Body groundAlways1 MW or higher
A20±27 (±SR) ±
Body groundAlways1 MW or higher
NG Go to step 11.
OK

H02757H10600H40103W02044H23363
DTC B1610/13
DLC3
TC CG
Airbag
Sensor
Assembly
Front Airbag
Sensor LH
DTC B1615/14
D
C
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1167
1361 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check front airbag sensor RH.
PREPARATION:
(a) Connect the connectors to the airbag sensor assembly.
(b) Interchange the front airbag sensor RH with LH and con-
nect the connectors to them.
(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 B1610/13 is output.A
DTC B1615/14 is output.B
DTC B1610/13 and B1615/14 are not
output.C
HINT:
Codes other than DTC B1610/13 and B1615/14 may be output
at this time, but they are not related to this check.
A Replace airbag sensor assembly
(see page RS±84).
B Replace front airbag sensor RH
(see page RS±89).
C
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).

H23631H03352H23983H24011
Airbag
Sensor
Assembly Front Airbag
Sensor RH
Engine Room Main Wire
A
B
C D E F
Service Wire
Cowl Wire
+SR±SR
A12IL3
+SR ±SR
H03354H23983H24012
Airbag
Sensor
Assembly
+SR±SRA
B D E
C F
Front Airbag
Sensor RH
Cowl WireEngine Room Main Wire
IL3
DI±1168
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1362 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check engine room main wire (open).
PREPARATION:
Disconnect the engine room main wire connector from the cowl
wire.
HINT:
The service wire has already been inserted into connector ºEº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IL3±1 (+SR) ±
IL3±2 (±SR)AlwaysBelow 1 W
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.
9 Check engine room main wire (short).
PREPARATION:
Disconnect the engine room main wire connector from the cowl
wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IL3±1 (+SR) ±
IL3±2 (±SR)Always1 MW or higher
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.