TOYOTA SEQUOIA 2001 Service Repair Manual

H22552
Ignition Switch
Passenger Airbag
ON/OFF Indicator
(ºONº)
Passenger Airbag
ON/OFF Indicator
(ºOFFº)ON
OFF
ABC
4 sec. 2 sec.
4 sec. 2 sec.
ON/OFF condition depends on the
front passenger detection results. ON
OFF
ON
OFF
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1229
1423 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
1 Check passenger airbag ON/OFF indicator.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Check the passenger airbag ON/OFF indicator operation.
HINT:
Refer to the normal condition of the passenger airbag ON/OFF indicator (see page DI±1137).
RESULT:
A:
During period ºAº in the illustration, even if both the ºONº and ºOFFº passenger airbag ON/OFF
indicators normally come on, both of them do not go off during period ºBº.
During periods ºAº and ºBº in the illustration, even if both the ºONº and ºOFFº passenger air-
bag ON/OFF indicators normally come on, both of them come on during period ºCº.
B:
During period ºAº, neither the ºONº nor ºOFFº passenger airbag ON/OFF indicators come on,
or either of them does not come on.
During period ºCº, even if the front passenger seat is occupied, neither the ºONº nor ºOFFº
passenger airbag ON/OFF indicators come on.
B Go to step 7.
A

H24023
DI±1230
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1424 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check integration control and panel (passenger airbag ON/OFF indicator).
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 connectors from the airbag sensor as-
sembly.
(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) Check the passenger airbag ON/OFF indicator operation.
OK:
Neither the ºONº nor ºOFFº passenger airbag ON/
OFF indicators come on.
NG Go to step 3.
OK
Replace airbag sensor assembly (see page RS±82).
3 Prepare for inspection.
PREPARATION:
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.
NEXT

H01015G27651H23985
Cowl Wire
Airbag
Sensor
Assembly Integration
Control and Panel
A
B
C D
P±ABPAON
A20
H01015G27651H23985
Cowl Wire
Airbag
Sensor
Assembly Integration
Control and Panel
A
B
C D
P±ABPAON
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1231
1425 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check cowl wire (short to ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±17 (P±AB) ±
Body groundAlways1 MW or higher
A20±23 (PAON) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK
5 Check cowl wire (short).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±17 (P±AB) ±
A20±23 (PAON)Always1 MW or higher
NG Repair or replace cowl wire.
OK

H10600H01012H01069H24008
Airbag
Sensor
Assembly Integration
Control
and Panel
DLC3
TC CG
DTC B1660/43
DI±1232
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1426 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check integration control and panel.
PREPARATION:
(a) Connect the connectors to the airbag sensor assembly.
(b) Connect the connector to the integration control and pan-
el.
(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 B1660/43 is not output.
HINT:
Codes other than DTC B1660/43 may be output at this time, but
they are not related to this check.
NG Replace integration control and panel
(see page BO±89).
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).

H24027
Integration Control and Panel:
IG+ I19
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1233
1427 Author: Date:
2005 SEQUOIA (RM1146U)
7 Prepare for inspection.
PREPARATION:
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.
NEXT
8 Check cowl wire (source voltage).
PREPARATION:
(a) Disconnect the connector from the integration control and
panel.
(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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
I19±2 (IG+) ±
Body groundIgnition switch ON10 to 14 V
NG Repair or replace cowl wire (integration control
and panel ± battery).
OK

H01010H23951H24028H24556
Cowl Wire
Airbag
Sensor
Assembly
Integration Control
and PanelA
B
C D
P±AB
PAONP±ABPAON
Service WireA20
I19
DI±1234
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1428 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check cowl wire (open).
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) Using a service wire, connect I19±17 (P±AB) and I19±16
(PAON) of connector ºCº.
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±17 (P±AB) ±
A20±23 (PAON)AlwaysBelow 1 W
NG Repair or replace cowl wire.
OK

H01015G27651H23985
Cowl Wire
Airbag
Sensor
Assembly Integration
Control and Panel
A
B
C D
P±ABPAON
A20
H23951
P±ABPAON
A20
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1235
1429 Author: Date:
2005 SEQUOIA (RM1146U)
10 Check cowl wire (short to B+).
PREPARATION:
(a) Disconnect the service wire from connector ºCº.
(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.
(b) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A20±17 (P±AB) ±
Body groundIgnition switch ONBelow 1 V
A20±23 (PAON) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace cowl wire.
OK
11 Check cowl wire (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±17 (P±AB) ±
Body groundAlways1 MW or higher
A20±23 (PAON) ±
Body groundAlways1 MW or higher
NG Repair or replace cowl wire.
OK

H24027PAON I19P±AB Integration Control and Panel:
H24023
DI±1236
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1430 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check integration control and panel (passenger airbag ON/OFF indicator).
PREPARATION:
(a) Connect the connector to the integration control and pan-
el.
(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.
(b) Check that the passenger airbag ON/OFF indicator
condition in the table below.
OK:
Tester ConnectionConditionIndicator
I19±16 (PAON) ±
Body groundIgnition switch ONON indicator comes on
I19±17 (P±AB) ±
Body groundIgnition switch ONOFF indicator comes on
NG Replace integration control and panel
(see page BO±89).
OK

H10600H01012H01069H24008
Airbag
Sensor
Assembly Integration
Control
and Panel
DLC3
TC CG
DTC B1660/43
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1237
1431 Author: Date:
2005 SEQUOIA (RM1146U)
13 Check airbag sensor assembly.
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) Connect the connectors to the airbag sensor assembly.
(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, 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 B1660/43 is not output.
HINT:
Codes other than DTC B1660/43 may be output at this time, but
they are not related to this check.
NG Replace airbag sensor assembly
(see page RS±82).
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).

DI±1238
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1432 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1661/44 Roll Over Cut Off Indicator Malfunction
CIRCUIT DESCRIPTION
The RSCA OFF switch is a mechanism that operates both right and left side of the curtain shield airbag as-
sembly and the seat belt pretensioners when the airbag sensor assembly detects a roll±over.
The RSCA OFF indictor is installed in the combination meter.
As operating the RSCA OFF switch, the indicator comes on to inform the driver that the roll±over detection
system is not working.
The initial setting of the roll±over detection system is on. It automatically operates every time the ignition
switch is turned on.
DTC No.DTC Detecting ConditionTrouble Area
B1661/44

The airbag sensor assembly receives an open circuit sig-
nal, a short circuit to ground signal or a short circuit to B+
signal in the roll over cut off indicator circuit for 2 seconds.

RSCA OFF indicator malfunction

Airbag sensor assembly malfunction

Combination meter (RSCA OFF indicator)

Airbag sensor assembly

Cowl wire
DIDH2±01