2001 TOYOTA SEQUOIA O2 sensor

H23631H03352H23983H24011
Airbag
Sensor
Assembly Front Airbag
Sensor LH
Engine Room Main Wire
A
B
C D E F
Service Wire
Cowl Wire
+SL±SL
A11IA3
+SL ±SL
H03354H23983H24012
Airbag
Sensor
Assembly
+SL±SLA
B D E
C F
Front Airbag
Sensor LH
Cowl WireEngine Room Main Wire
IA3
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1177
1371 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
IA3±1 (+SL) ±
IA3±2 (±SL)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
IA3±1 (+SL) ±
IA3±2 (±SL)Always1 MW or higher
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H03354H23983H24012
Airbag
Sensor
Assembly
+SL±SLA
B D E
C F
Front Airbag
Sensor LH
Cowl WireEngine Room Main Wire
IA3
DI±1178
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1372 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check engine room main wire (short to B+).
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) Disconnect the engine room main wire connector from the
cowl wire.
(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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
IA3±1 (+SL) ±
Body groundIgnition switch ONBelow 1 V
IA3±2 (±SL) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H03354H23983H24012
Airbag
Sensor
Assembly
+SL±SLA
B D E
C F
Front Airbag
Sensor LH
Cowl WireEngine Room Main Wire
IA3
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1179
1373 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check engine room main wire (short to ground).
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
IA3±1 (+SL) ±
Body groundAlways1 MW or higher
IA3±2 (±SL) ±
Body groundAlways1 MW or higher
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H02751
Airbag Sensor Assembly S16
Side Airbag Sensor Assembly RH
A2122
VUPR W
2
ESR A2120
B
1 VUPR
ESR DI±1180
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1374 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1620/21 Side Airbag Sensor Assembly (RH)
Malfunction
CIRCUIT DESCRIPTION
The side airbag sensor assembly RH consists of the safing sensor, the diagnostic circuit, the lateral decelera-
tion sensor, etc.
If the airbag sensor assembly receives signals from the lateral deceleration sensor, it determines whether
or not the SRS should be activated.
DTC B1620/21 is recorded when a malfunction is detected in the side airbag sensor assembly RH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1620/21

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 side airbag sensor
assembly RH circuit for 2 seconds.

Side airbag sensor assembly RH malfunction

Airbag sensor assembly malfunction

Side airbag sensor assembly RH

Airbag sensor assembly

Floor wire
WIRING DIAGRAM
DIDGU±01

C84208H10600H43425H24649
CG
TCDTC B1620/21
DLC3
Side Airbag Sensor
Assembly RH
Airbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1181
1375 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 B1620/21 is not output.
HINT:
Codes other than DTC B1620/21 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).

H01015
C91384G27650H23090
Side Airbag
Sensor Assembly RHFloor Wire
Airbag
Sensor
Assembly
VUPR
ESR
SST
A
B C D
VUPR
ESR A21
S16
DI±1182
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1376 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 side airbag sensor
assembly RH.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check floor wire (open).
PREPARATION:
(a) Disconnect the connectors from the airbag sensor as-
sembly and the side airbag sensor assembly RH.
(b) Using SST, connect S16±2 (VUPR) and S16±1 (ESR) of
connector ºCº.
SST 09843±18040
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A21±22 (VUPR) ±
A21±20 (ESR)AlwaysBelow 1 W
NG Repair or replace floor wire.
OK

H01015G27650H23107
Airbag
Sensor
Assembly Side Airbag
Sensor Assembly RH
VUPR
Floor Wire
ESR
A
B
C D
A21
H01015G27650H23107
Airbag
Sensor
Assembly Side Airbag
Sensor Assembly RH
VUPR
Floor Wire
ESR
A
B
C D
A21
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1183
1377 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check floor wire (short).
PREPARATION:
Disconnect the SST from connector ºCº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A21±22 (VUPR) ±
A21±20 (ESR)Always1 MW or higher
NG Repair or replace floor wire.
OK
5 Check floor 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
A21±22 (VUPR) ±
Body groundIgnition switch ONBelow 1 V
A21±20 (ESR) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace floor wire.
OK

H01015G27650H23107
Airbag
Sensor
Assembly Side Airbag
Sensor Assembly RH
VUPR
Floor Wire
ESR
A
B
C D
A21
DI±1184
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1378 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check floor wire (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
A21±22 (VUPR) ±
Body groundAlways1 MW or higher
A21±20 (ESR) ±
Body groundAlways1 MW or higher
NG Repair or replace floor wire.
OK