TOYOTA SEQUOIA 2001 Service Repair Manual

H03354H23983H24012
Airbag
Sensor
Assembly
+SR±SRA
B D E
C F
Front Airbag
Sensor RH
Cowl WireEngine Room Main Wire
IL3
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1169
1363 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
IL3±1 (+SR) ±
Body groundIgnition switch ONBelow 1 V
IL3±2 (±SR) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H03354H23983H24012
Airbag
Sensor
Assembly
+SR±SRA
B D E
C F
Front Airbag
Sensor RH
Cowl WireEngine Room Main Wire
IL3
DI±1170
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1364 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
IL3±1 (+SR) ±
Body groundAlways1 MW or higher
IL3±2 (±SR) ±
Body groundAlways1 MW or higher
NG Repair or replace engine room main wire.
OK
Repair or replace cowl wire.

H02750
Airbag Sensor Assembly
A20+SL 30
IA31
IA32
A2028 A11
Front Airbag Sensor LH
2
1±SL W
W
BB +SL
±SL
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1171
1365 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1615/14 Front Airbag Sensor LH Malfunction
CIRCUIT DESCRIPTION
The front airbag sensor LH 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 B1615/14 is recorded when a malfunction is detected in the front airbag sensor LH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1615/14

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
LH circuit for 2 seconds.

Front airbag sensor LH malfunction

Airbag sensor assembly malfunction

Front airbag sensor LH

Airbag sensor assembly

Cowl wire

Engine room main wire
WIRING DIAGRAM
DIDGT±01

H10600 H02757W02044H23570
CG TCDTC B1615/14
DLC3 Front Airbag
Sensor LHAirbag
Sensor
Assembly
DI±1172
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1366 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 B1615/14 is not output.
HINT:
Codes other than DTC B1615/14 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 LHAirbag
Sensor
Assembly
+SL
±SL
A
B D F
E
C C
Service Wire
+SL
±SL
A20A11
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1173
1367 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
LH.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check front airbag sensor LH circuit (open).
PREPARATION:
(a) Disconnect the connectors from the airbag sensor as-
sembly and the front airbag sensor LH.
(b) Using a service wire, connect A11±2 (+SL) and A11±1
(±SL) 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±30 (+SL) ±
A20±28 (±SL)AlwaysBelow 1 W
NG Go to step 8.
OK

H03355G27651H23624
Front Airbag
Sensor LHAirbag
Sensor
Assembly
±SL +SL
A
B D E F
C
A20
H03355G27651H23624
Front Airbag
Sensor LHAirbag
Sensor
Assembly
±SL +SL
A
B D E F
C
A20
DI±1174
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1368 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check front airbag sensor LH 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±30 (+SL) ±
A20±28 (±SL)Always1 MW or higher
NG Go to step 9.
OK
5 Check front airbag sensor LH 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±30 (+SL) ±
Body groundIgnition switch ONBelow 1 V
A20±28 (±SL) ±
Body groundIgnition switch ONBelow 1 V
NG Go to step 10.
OK

H03355G27651H23624
Front Airbag
Sensor LHAirbag
Sensor
Assembly
±SL +SL
A
B D E F
C
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1175
1369 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check front airbag sensor LH 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±30 (+SL) ±
Body groundAlways1 MW or higher
A20±28 (±SL) ±
Body groundAlways1 MW or higher
NG Go to step 11.
OK

H02757H10600H40103W02044H23363
DTC B1610/13
DLC3
TC CG
Airbag
Sensor
Assembly
Front Airbag
Sensor RH
DTC B1615/14
D
C
DI±1176
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1370 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check front airbag sensor LH.
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 B1615/14 is output.A
DTC B1610/13 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 LH
(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 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.