TOYOTA SEQUOIA 2001 Service Repair Manual

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1449
1643 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.
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 B1835 is output.A
DTC B1836 is output.B
DTC B1837 is output.C
DTC B1838 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 58 is output.E
HINT:
Codes other than DTC B1835, B1836, B1837, B1838 and DTC 58 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

H01019
H16275H23590
Airbag
Sensor
Assembly
ICL+
ICL± Floor Wire No. 2
A
B C D
Curtain Shield
Airbag LH Squib
C11
DI±1450
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1644 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check connector.
CHECK:
Check that the floor wire No. 2 connector (on the curtain shield airbag assembly LH 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 No. 2.
OK
3 Check floor wire No. 2 (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
C11±1 (ICL+) ±
C11±2 (ICL±)Always1 MW or higher
NG Repair or replace floor wire No. 2.
OK
Go to step 10.

H01019
H16275H23590
Airbag
Sensor
Assembly
ICL+
ICL± Floor Wire No. 2
A
B C D
Curtain Shield
Airbag LH Squib
C11
H01019
H16275H23590
Airbag
Sensor
Assembly
ICL+
ICL± Floor Wire No. 2
A
B C D
Curtain Shield
Airbag LH Squib
C11
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1451
1645 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check floor wire No. 2 (open).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
C11±1 (ICL+) ±
C11±2 (ICL±)AlwaysBelow 1 W
NG Repair or replace floor wire No. 2.
OK
Go to step 11.
5 Check floor wire No. 2 (short to ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
C11±1 (ICL+) ±
Body groundAlways1 MW or higher
C11±2 (ICL±) ±
Body groundAlways1 MW or higher
NG Repair or replace floor wire No. 2.
OK
Go to step 11.

H01019
H16275H23590
Airbag
Sensor
Assembly
ICL+
ICL± Floor Wire No. 2
A
B C D
Curtain Shield
Airbag LH Squib
C11
DI±1452
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1646 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check floor wire No. 2 (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
C11±1 (ICL+) ±
Body groundIgnition switch ONBelow 1 V
C11±2 (ICL±) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace floor wire No. 2.
OK
Go to step 11.
7 Check connector.
CHECK:
Check that the floor wire No. 2 connector (on the curtain shield airbag assembly LH 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 No. 2.
OK

H01019
H16275H23590
Airbag
Sensor
Assembly
ICL+
ICL± Floor Wire No. 2
A
B C D
Curtain Shield
Airbag LH Squib
C11
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1453
1647 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check floor wire No. 2 (curtain shield airbag LH squib circuit).
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
C11±1 (ICL+) ±
Body groundIgnition switch ONBelow 1 V
C11±2 (ICL±) ±
Body groundIgnition switch ONBelow 1 V
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 for 90 seconds.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
C11±1 (ICL+) ±
C11±2 (ICL±)AlwaysBelow 1 W
C11±1 (ICL+) ±
Body groundAlways1 MW or higher
C11±2 (ICL±) ±
Body groundAlways1 MW or higher
PREPARATION:
Release the activation prevention mechanism built into the con-
nector ºBº (see page DI±1137).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
C11±1 (ICL+) ±
C11±2 (ICL±)Always1 MW or higher
NG Repair or replace floor wire No. 2.
OK

H01018H10600H16841H24654
DTC 58 DLC3
TC CG Curtain Shield
Airbag LH Squib
DCAirbag
Sensor
Assembly
DI±1454
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1648 Author: Date:
2005 SEQUOIA (RM1146U)
9 Replace curtain shield airbag assembly LH (curtain shield airbag LH squib).
PREPARATION:
(a) Replace the curtain shield airbag assembly LH (see page
RS±71).
HINT:
Perform the inspection using parts from a normal vehicle if pos-
sible.
(b) Connect the connectors to the airbag sensor assembly.
(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 58 is not output.
HINT:
Codes other than DTC 58 may be output at this time, but they
are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
OK
END

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.

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

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).

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 malfunction
Front 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 malfunction
Front 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 malfunction
Front seat outer belt RH (P/T squib RH)

Airbag sensor assembly

Floor wire
DIDHQ±01