Page 1657 of 4323
H01017H23472
Airbag
Sensor
Assembly Curtain Shield
Airbag LH Squib
DC
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1455
1649 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check airbag sensor assembly.
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 B1835 is not output.
HINT:
Codes other than DTC B1835 may be output at this time, but
they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
OK
Go to step 12.
Page 1658 of 4323

H01017H23982H23992
Airbag
Sensor
Assembly
ICL+ICL± D
C
Service Wire Curtain Shield
Airbag LH Squib
C11
DI±1456
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1650 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check airbag sensor assembly.
PREPARATION:
(a) From the step 6:
Turn the ignition switch to the LOCK position.
(b) From the step 6:
Disconnect the negative (±) terminal cable from the bat-
tery, and wait for at least 90 seconds.
(c) Using a service wire, connect C11±1 (ICL+) and C11±2
(ICL±) of the connector ºCº.
NOTICE:
Twist the end of the service wire in order to insert it
into the connector.
Do not forcibly insert the twisted service wire into the
terminals of the connector when connecting.
(d) Connect the connectors to the airbag sensor assembly.
(e) 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 B1836, B1837 or B1838 is not output.
HINT:
Codes other than DTC B1836, B1837 and B1838 may be out-
put at this time, but they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
OK
Page 1659 of 4323

H01018H23474
Curtain Shield
Airbag LH Squib
Airbag
Sensor
Assembly DC
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1457
1651 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check curtain shield airbag assembly LH (curtain shield airbag LH squib).
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) From the step 9:
Disconnect the service wire from connector ºCº.
(d) Connect the connector to the curtain shield airbag as-
sembly LH.
(e) 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 B1835, B1836, B1837 or B1838 is not output.
HINT:
Codes other than DTC B1835, B1836, B1837 and B1838 may
be output at this time, but they are not related to this check.
NG Replace curtain shield airbag assembly LH
(see page RS±71).
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).
HINT:
Perform the simulation method by selecting the check mode with the hand±held tester (see page
DI±1151).
After selecting the check mode, perform the simulation method by wiggling each connector of the air-
bag system or driving the vehicle on a city or rough road (see page DI±1151).
Page 1660 of 4323

DI±1458
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1652 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1900/73 Short in P/T Squib (RH) Circuit
DTC B1901/73 Open in P/T Squib (RH) Circuit
DTC B1902/73 Short in P/T Squib (RH) Circuit (to Ground)
DTC B1903/73 Short in P/T Squib (RH) Circuit (to B+)
CIRCUIT DESCRIPTION
The P/T squib RH circuit consists of the airbag sensor assembly and the front seat outer belt RH.
The circuit instructs the SRS to deploy when deployment conditions are met.
These DTCs are recorded when a malfunction is detected in the P/T squib RH circuit.
DTC No.DTC Detection ConditionTrouble Area
B1900/73
The airbag sensor assembly receives a line short circuit
signal 5 times in the P/T squib RH circuit during primary
check.
P/T squib RH malfunction
Airbag sensor assembly malfunction
Front seat outer belt RH (P/T squib RH)
Airbag sensor assembly
Floor wire
B1901/73
The airbag sensor assembly receives an open circuit sig-
nal in the P/T squib RH circuit for 2 seconds.
P/T squib RH malfunction
Airbag sensor assembly malfunctionFront seat outer belt RH (P/T squib RH)
Airbag sensor assembly
Floor wire
B1902/73
The airbag sensor assembly receives a short circuit to
ground signal in the P/T squib RH circuit for 0.5 seconds.
P/T squib RH malfunction
Airbag sensor assembly malfunctionFront seat outer belt RH (P/T squib RH)
Airbag sensor assembly
Floor wire
B1903/73
The airbag sensor assembly receives a short to B+ circuit
signal in the P/T squib RH circuit for 0.5 seconds.
P/T squib RH malfunction
Airbag sensor assembly malfunctionFront seat outer belt RH (P/T squib RH)
Airbag sensor assembly
Floor wire
DIDHQ±01
Page 1661 of 4323
H01454
P11
P/T Squib RHAirbag Sensor Assembly
A214
PR+ Y±B
1
2Y
A213
PR±
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1459
1653 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 1662 of 4323

DI±1460
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1654 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.
(g) w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH.
(h) Disconnect the connectors from the front seat outer belt LH.
1 Check DTC.
CHECK:
(a) Proceed to each step according to how to read DTC.
(1) If using the hand±held tester (read the 5±digit of DTC):
Using the hand±held tester, check the DTCs (see page DI±1147).
RESULT:
DTC B1900 is output.A
DTC B1901 is output.B
DTC B1902 is output.C
DTC B1903 is output.D
(2) If not using the hand±held tester (read the 2±digit of DTC):
Check the DTCs (see page DI±1147).
RESULT:
DTC 73 is output.E
HINT:
Codes other than DTC B1900, B1901, B1902, B1903 and DTC 73 may be output at this time, but they are
not related to this check.
B Go to step 4.
C Go to step 5.
D Go to step 6.
E Go to step 7.
A
Page 1663 of 4323
H01019H43108H23604
P/T Squib RH
PR±
PR+Airbag
Sensor
Assembly
Floor Wire
B C
DA
P11
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1461
1655 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check connector.
CHECK:
Check that the floor wire connector (on the front seat outer belt RH side) is not damaged.
OK:
The lock button is not disengaged, or the claw of the lock is not deformed or damaged.
NG Repair or replace floor wire.
OK
3 Check floor wire (short).
PREPARATION:
Release the activation prevention mechanism built into con-
nector ºBº (see page DI±1137).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
P11±1 (PR+) ±
P11±2 (PR±)Always1 MW or higher
NG Repair or replace floor wire.
OK
Go to step 10.
Page 1664 of 4323
H01019H43108H23604
P/T Squib RH
PR±
PR+Airbag
Sensor
Assembly
Floor Wire
B C
DA
P11
H01019H43108H23604
P/T Squib RH
PR±
PR+Airbag
Sensor
Assembly
Floor Wire
B C
DA
P11
DI±1462
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1656 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check floor wire (open).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
P11±1 (PR+) ±
P11±2 (PR±)AlwaysBelow 1 W
NG Repair or replace floor wire.
OK
Go to step 11.
5 Check floor wire (short to ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
P11±1 (PR+) ±
Body groundAlways1 MW or higher
P11±2 (PR±) ±
Body groundAlways1 MW or higher
NG Repair or replace floor wire.
OK
Go to step 11.