Page 1681 of 4323

H01018H23474
Airbag
Sensor
Assembly DC P/T Squib LH
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1479
1673 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check front seat outer belt LH (P/T squib LH).
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 10:
Disconnect the service wire from connector ºCº.
(d) Connect the connector to the front seat outer belt 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 B1905, B1906, B1907 or B1908 is not output.
HINT:
Codes other than DTC B1905, B1906, B1907 and B1908 may
be output at this time, but they are not related to this check.
NG Replace front seat outer belt LH
(see page BO±163).
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 1682 of 4323
DI±1480
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1674 Author: Date:
2005 SEQUOIA (RM1146U)
DTC Normal Source Voltage Drop
CIRCUIT DESCRIPTION
The SRS is equipped with a voltage±increase circuit (DC±DC converter) in the airbag sensor assembly in
case the source voltage drops.
When the battery voltage drops, the voltage±increase circuit (DC±DC converter) functions to increase the
voltage of the SRS to normal voltage.
A malfunction in this circuit is displayed differently from other codes. The source voltage drop is indicated
when the SRS warning light comes on without showing any DTCs.
A malfunction in this circuit is not recorded in the airbag sensor assembly. The SRS warning light automati-
cally goes off when the source voltage returns to normal.
DTC No.Detection Item
(Normal)Source voltage drop
DIDHS±01
Page 1683 of 4323
H24000
Airbag Sensor
Assembly
IG2 A20 B
Engine Room J/B Instrument Panel J/B
Instrument Panel J/B I18
Ignition SW
21
1A3
1J7 1C2
1C3 AM2 IG2B±R
6 5IGN1
AM2
2C1
2D1 W±R W±R
B
4
5
BF10
Fusible Link
BlockE1
E2 A2025
A2026 W±B
W±B 1A6
1F9
1F 10
1A8 W±B
W±B A
A J8
J/C
IE Battery
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1481
1675 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM
Page 1684 of 4323

H23040
IG2
A20
DI±1482
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1676 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 battery.
CHECK:
Measure the voltage of the battery.
OK:
Voltage: 11 to 14 V
NG Replace battery.
OK
2 Check source voltage (power source).
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±21 (IG2) ±
Body groundIgnition switch ON10 to 14 V
NG Repair or replace wire harness (battery ± airbag
sensor assembly).
OK
Page 1685 of 4323
H23040E2E1
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1483
1677 Author: Date:
2005 SEQUOIA (RM1146U)
3 Check wire harness (airbag sensor assembly ± body 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±25 (E1) ±
Body groundAlwaysBelow 1 W
A20±26 (E2) ±
Body groundAlwaysBelow 1 W
NG Repair or replace wire harness.
OK
Page 1686 of 4323

DI±1484
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1678 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check SRS warning light.
PREPARATION:
(a) Connect the connectors to the airbag sensor assembly.
(b) Connect the connectors to the steering wheel pad.
(c) Connect the connectors to the front passenger airbag assembly.
(d) w/ Side and curtain shield airbag:
Connect the connectors to the side airbag assembly LH and RH.
(e) w/ Side and curtain shield airbag:
Connect the connectors to the curtain shield airbag assembly LH and RH.
(f) Connect the connectors to the front seat outer belt LH and RH.
(g) 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 6 seconds.
(b) Operate all components of the electrical system (defogger, wiper, headlight, heater blower, etc.) and
check the SRS warning light operation.
OK:
The SRS warning light does not come on.
NG Replace airbag sensor assembly
(see page RS±82).
OK
END
Page 1687 of 4323

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1485
1679 Author: Date:
2005 SEQUOIA (RM1146U)
Trouble in Indicator of Passenger Airbag ON/OFF Indicator
CIRCUIT DESCRIPTION
The occupant classification system detects the front passenger seat condition. It then informs a passenger
of the front passenger airbag assembly condition (activated/not activated) by the passenger airbag ON/OFF
indicator.
The table below shows the normal indication condition of the passenger airbag ON/OFF indicator and the
front passenger seat condition.
Front passenger seat conditionON IndicatorOFF Indicator
Adult is seated.ONOFF
Child is seated.OFFON
VacantOFFOFF
Occupant classification system failureOFFON
INSPECTION PROCEDURE
1 Check SRS warning light.
CHECK:
Turn the ignition switch to the ON position, and check the SRS warning light condition.
HINT:
If this trouble occurs, the SRS warning light is off. If it is on, a DTC is output. Troubleshoot for the output DTC.
OK:
The SRS warning light does not come on.
NG Check DTC (see page DI±1147).
OK
DIDHT±01
Page 1688 of 4323
DI±1486
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1680 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check passenger airbag ON/OFF indicator condition.
PREPARATION:
Turn the ignition switch to the ON position.
CHECK:
Check if the passenger airbag ON/OFF indicator correctly indicates the front passenger seat condition.
OK:
Front passenger seat conditionON IndicatorOFF Indicator
Adult is seated.ONOFF
Child is seated.OFFON
VacantOFFOFF
Occupant classification system failureOFFON
NG Go to step 3.
OK
END