TOYOTA SEQUOIA 2001 Service Repair Manual

C84205G27650H24003
Occupant
Classification ECUAirbag
Sensor
Assembly
D
A21
FSR±FSR+CBA
E F
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1209
1403 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check occupant classification system circuit (short to 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
A21±16 (FSR+) ±
Body groundAlways1 MW or higher
A21±24 (FSR±) ±
Body groundAlways1 MW or higher
NG Go to step 12.
OK
Replace airbag sensor assembly (see page RS±82).
HINT:
Check for DTCs of the airbag sensor assembly. If the DTC B1650/32 is detected, replace the occupant clas-
sification ECU (see page RS±111) and perform a ºZero point calibrationº and ºSensitivity checkº of the occu-
pant classification system (see page DI±1128).

C84213
H43694H24024H24004
Occupant
Classification
ECUAirbag
Sensor
Assembly
A
O6
FSR+FSR±B C D E F
Service Wire
BL1
Seat Wire No. 1
Floor Wire
FSR+
FSR±
C84211H24024H24005
Occupant
Classification
ECU
Airbag
Sensor
Assembly
A
FSR+
FSR± B C D E F
BL1Seat Wire No. 1
Floor Wire
DI±1210
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1404 Author: Date:
2005 SEQUOIA (RM1146U)
9 Check seat wire No. 1 (open).
PREPARATION:
Disconnect the seat wire No. 1 connector from the floor wire.
HINT:
The service wire has already been inserted into connector ºEº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
BL1±3 (FSR+) ±
BL1±5 (FSR±)AlwaysBelow 1 W
NG Repair or replace seat wire No. 1.
OK
Repair or replace floor wire.
10 Check seat wire No. 1 (short).
PREPARATION:
Disconnect the seat wire No. 1 connector from the floor wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
BL1±3 (FSR+) ±
BL1±5 (FSR±)Always1 MW or higher
NG Repair or replace seat wire No. 1.
OK
Repair or replace floor wire.

C84211H24024H24005
Occupant
Classification
ECU
Airbag
Sensor
Assembly
A
FSR+
FSR± B C D E F
BL1Seat Wire No. 1
Floor Wire
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1211
1405 Author: Date:
2005 SEQUOIA (RM1146U)
11 Check seat wire No. 1 (short to B+).
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.
(c) Disconnect the seat wire No. 1 connector from the floor
wire.
(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) Measure the voltage according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
BL1±3 (FSR+) ±
Body groundIgnition switch ONBelow 1 V
BL1±5 (FSR±) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace seat wire No. 1.
OK
Repair or replace floor wire.

C84211H24024H24005
Occupant
Classification
ECU
Airbag
Sensor
Assembly
A
FSR+
FSR± B C D E F
BL1Seat Wire No. 1
Floor Wire
DI±1212
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1406 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check seat wire No. 1 (short to ground).
PREPARATION:
Disconnect the seat wire No. 1 connector from the floor wire.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
BL1±3 (FSR+) ±
Body groundAlways1 MW or higher
BL1±5 (FSR±) ±
Body groundAlways1 MW or higher
NG Repair or replace seat wire No. 1.
OK
Repair or replace floor wire.

H23993
Airbag Sensor Assembly
A199
LSP+ W
VS
GNDSeat
Position
Airbag
Sensor
Assembly B18 (*1)
Buckle SW LH
Seat Position Airbag Sensor Assembly
A1917
LSP± B 3
5
*1: The connectors of the seat position airbag sensor assembly and the
front seat inner belt LH (buckle switch LH) are in common use.
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1213
1407 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1653/35 Seat Position Sensor Assembly
Malfunction
CIRCUIT DESCRIPTION
The seat position airbag sensor assembly circuit consists of the airbag sensor assembly and the seat posi-
tion airbag sensor assembly.
DTC B1653/35 is recorded when a malfunction is detected in the seat position sensor assembly circuit.
DTC No.DTC Detection ConditionTrouble Area
B1653/35

The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the seat position sen-
sor assembly circuit for 2 seconds.

Seat position airbag sensor assembly malfunction

Airbag sensor assembly malfunction

Seat position airbag sensor assembly

Airbag sensor assembly

Floor wire No. 2
WIRING DIAGRAM
DIDGZ±01

H10600H01007H43920H23364
DLC3
CG TCDTC B1653/35
Seat
Position
Airbag
Sensor
AssemblyAirbag
Sensor
Assembly
DI±1214
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1408 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 B1653/35 is not output.
HINT:
Codes other than DTC B1653/35 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).

H01010G27652H24025H24542
Seat
Position
Airbag
Sensor
Assembly
LSP±LSP+
Airbag
Sensor
Assembly
Service WireA19
A
B C D
B18
Floor Wire No. 2
3
5
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1215
1409 Author: Date:
2005 SEQUOIA (RM1146U)
2 Check connection of connectors.
PREPARATION:
(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.
CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and the seat position air-
bag sensor assembly.
OK:
The connectors are connected securely.
NG Connect connectors, then go to step 1.
OK
3 Check floor wire No. 2 (open).
PREPARATION:
(a) Disconnect the connectors from the airbag sensor as-
sembly and the seat position airbag sensor assembly.
(b) Using a service wire, connect B18±3 and B18±5 of con-
nector 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
A19±9 (LSP+) ±
A19±17 (LSP±)AlwaysBelow 1 W
NG Repair or replace floor wire No. 2.
OK

H01010G27652H23365
Airbag
Sensor
Assembly
Seat
Position
Airbag
Sensor
Assembly
LSP+
LSP± A19
A
B D
C
Floor Wire No. 2
H01010G27652H23365
Airbag
Sensor
Assembly
Seat
Position
Airbag
Sensor
Assembly
LSP+
LSP± A19
A
B D
C
Floor Wire No. 2
DI±1216
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1410 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check floor wire No. 2 (short).
PREPARATION:
Disconnect the service wire from connector ºCº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A19±9 (LSP+) ±
A19±17 (LSP±)Always1 MW or higher
NG Repair or replace floor wire No. 2.
OK
5 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
A19±9 (LSP+) ±
Body groundIgnition switch ONBelow 1 V
A19±17 (LSP±) ±
Body groundIgnition switch ONBelow 1 V
NG Repair or replace floor wire No. 2.
OK

H01010G27652H23365
Airbag
Sensor
Assembly
Seat
Position
Airbag
Sensor
Assembly
LSP+
LSP± A19
A
B D
C
Floor Wire No. 2
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1217
1411 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check floor wire No. 2 (short to 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
A19±9 (LSP+) ±
Body groundAlways1 MW or higher
A19±17 (LSP±) ±
Body groundAlways1 MW or higher
NG Repair or replace floor wire No. 2.
OK

H10600H01007H43920H23364
DLC3
CG TCDTC B1653/35
Seat
Position
Airbag
Sensor
AssemblyAirbag
Sensor
Assembly
DI±1218
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1412 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check seat position airbag sensor assembly.
PREPARATION:
(a) Connect the connectors of the seat position airbag sensor
assembly and 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 B1653/35 is not output.
HINT:
Codes other than DTC B1653/35 may be output at this time, but
they are not related to this check.
NG Go to step 8.
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).
8 Replace seat position airbag sensor assembly.
(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) Replace the seat position airbag sensor assembly (see page RS±104).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
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