2001 TOYOTA SEQUOIA Page 18

DIDGQ±01
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1155
1349 Author: Date:
2005 SEQUOIA (RM1146U)
DIAGNOSTIC TROUBLE CODE CHART
1. DTCS FOR SUPPLEMENTAL RESTRAINT SYSTEM
If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below
(Proceed to the page listed for that circuit).
HINT:

When the SRS warning light remains on and the DTC output is the normal system code, a voltage
source drop is likely to occur. This malfunction is not stored in the memory by the airbag sensor assem-
bly. If the power source voltage returns to normal, the SRS warning light will automatically go off.

When 2 or more codes are indicated, the code with the lower number appears first.

If a code is not listed on the display chart, the airbag sensor assembly may have failed.

In the case of any malfunction concerning an open circuit, short to ground, or short to B+ due to a squib,
other malfunction codes may not be detected. In this case, repair the malfunction currently indicated
and then perform malfunction diagnosis again.

Mark in the check mode column:
ºº: DTC is corresponding to the check mode.
º º: DTC is not corresponding to the check mode.

When the DTC B1650/32 is detected as a result of troubleshooting for the Supplemental Restraint Sys-
tem, perform troubleshooting for the occupant classification system as shown in the chart below.
DTC No.
(See
Page)
Detection ItemTrouble AreaCheck ModeSRS
Warning Light
B1000/31
(DI±1161)
Airbag sensor assembly malfunction
Airbag sensor assemblyON
B1610/13
(DI±1162)
Front airbag sensor RH malfunction

Front airbag sensor RH

Airbag sensor assembly

Cowl wire

Engine room main wire
ON
B1615/14
(DI±1171)
Front airbag sensor LH malfunction

Front airbag sensor LH

Airbag sensor assembly

Cowl wire

Engine room main wire
ON
B1620/21
(*1)
(DI±1180)

Side airbag sensor assembly RH malfunction

Side airbag sensor assembly RH

Airbag sensor assembly

Floor wire
ON
B1625/22
(*1)
(DI±1186)

Side airbag sensor assembly LH malfunction

Side airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
ON
B1630/23
(*1)
(DI±1192)

Curtain shield airbag sensor RH malfunction

Curtain shield airbag sensor assembly RH

Airbag sensor assembly

Floor wire
ON
B1635/24
(*1)
(DI±1198)

Curtain shield airbag sensor LH malfunction

Curtain shield airbag sensor assembly LH

Airbag sensor assembly

Floor wire No. 2
ON
B1650/32
(DI±1204)
Occupant classification system malfunction

Occupant classification system

Airbag sensor assembly

Floor wire

Seat wire No. 1
ON
B1653/35
(DI±1213)
Seat position sensor assembly malfunction

Seat position airbag sensor assembly

Airbag sensor assembly

Floor wire No. 2
ON

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1159
1353 Author: Date:
2005 SEQUOIA (RM1146U)Normal
(DI±1480)

Source voltage drop
Battery

Airbag sensor assemblyON
Normal
System normalOFF
*1: w/ Side and curtain shield airbag
2. DTCS FOR OCCUPANT CLASSIFICATION SYSTEM
If a trouble code is displayed during the DTC check, check the circuit listed for the code in the table below
(Proceed to the page listed for that circuit).
HINT:

When the DTC B1650/32 is detected as a result of troubleshooting for the Supplemental Restraint Sys-
tem, perform troubleshooting for the occupant classification system as shown in the chart below.

Use the hand±held tester to check/clear the DTC of the occupant classification ECU, otherwise the
DTC cannot be check/clear.
DTC No.
(See Page)Detection ItemTrouble AreaPassenger Airbag
ON/OFF Indicator
B1771
(DI±1251)
Passenger side buckle switch circuit
malfunction
Front seat inner belt RH

Occupant classification ECU

Seat wire No. 1
ON
B1780
(DI±1260)

Occupant classification sensor front
LH circuit malfunction
Front seat assembly RH (Occupant classification sensor
front LH)

Occupant classification ECU

Seat wire No. 1
ON
B1781
(DI±1270)

Occupant classification sensor front
RH circuit malfunction
Front seat assembly RH (Occupant classification sensor
front RH)

Occupant classification ECU

Seat wire No. 1
ON
B1782
(DI±1280)

Occupant classification sensor rear
LH circuit malfunction
Front seat assembly RH (Occupant classification sensor
rear LH)

Occupant classification ECU

Seat wire No. 1
ON
B1783
(DI±1290)

Occupant classification sensor rear
RH circuit malfunction
Front seat assembly RH (Occupant classification sensor
rear RH)

Occupant classification ECU

Seat wire No. 1
ON
B1785
(DI±1300)
Occupant classification sensor front
LH collision detection
Front seat assembly RH (Occupant classification sensor
front LH)

Occupant classification ECU
ON
B1786
(DI±1305)
Occupant classification sensor front
RH collision detection
Front seat assembly RH (Occupant classification sensor
front RH)

Occupant classification ECU
ON
B1787
(DI±1310)
Occupant classification sensor rear
LH collision detection
Front seat assembly RH (Occupant classification sensor
rear LH)

Occupant classification ECU
ON
B1788
(DI±1315)
Occupant classification sensor rear
RH collision detection
Front seat assembly RH (Occupant classification sensor
rear RH)

Occupant classification ECU
ON
B1790
(DI±1320)

Airbag sensor assembly communica-
tion circuit malfunction
Occupant classification ECU

Airbag sensor assembly

Floor wire

Seat wire No. 1
ON
B1793
(DI±1332)
Occupant classification sensor power
supply circuit malfunction
Occupant classification ECU

Front seat assembly RH (Occupant classification sensors)

Seat wire No. 1
ON

DIDGR±01
H10600H23564
DTC B1000/31
DLC3
TC CG
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1161
1355 Author: Date:
2005 SEQUOIA (RM1146U)
CIRCUIT INSPECTION
DTC B1000/31 Airbag Sensor Assembly Malfunction
CIRCUIT DESCRIPTION
The airbag sensor assembly consists of the airbag sensor, the safing sensor, the drive circuit, the diagnostic
circuit, ignition control, etc.
If the airbag sensor assembly receives signals from the airbag sensor, it determines whether or not the SRS
should be activated.
DTC B1000/31 is recorded when a malfunction is detected in the airbag sensor assembly.
DTC No.DTC Detection ConditionTrouble Area
B1000/31
Airbag sensor assembly malfunction
Airbag sensor assembly
HINT:
When a trouble code is displayed simultaneously with B1000/31, repair the malfunction indicated by this
code (except B1000/31) first.
INSPECTION PROCEDURE
1 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 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 B1000/31 is not output.
NG Replace airbag sensor assembly
(see page RS±84).
OK
Using simulation method, reproduce malfunction symptoms (see page IN±24).

H02757H10600H40103H23566
CG
TCDTC B1610/13
DLC3 Front Airbag
Sensor RHAirbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1163
1357 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 B1610/13 is not output.
HINT:
Codes other than DTC B1610/13 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).

H02757H10600H40103W02044H23363
DTC B1610/13
DLC3
TC CG
Airbag
Sensor
Assembly
Front Airbag
Sensor LH
DTC B1615/14
D
C
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1167
1361 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check front airbag sensor RH.
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 B1610/13 is output.A
DTC B1615/14 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 RH
(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).

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).

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).

C84208H10600H43425H24649
CG
TCDTC B1620/21
DLC3
Side Airbag Sensor
Assembly RH
Airbag
Sensor
Assembly
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1181
1375 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 B1620/21 is not output.
HINT:
Codes other than DTC B1620/21 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).