sensor TOYOTA SEQUOIA 2001 Service Repair Manual

C84205G27650H24003
Occupant
Classification ECUAirbag
Sensor
Assembly
D
A21
FSR±FSR+CBA
E F
C84207G27650H43694H24002
Occupant
Classification ECUAirbag
Sensor
Assembly
D
FSR±FSR+ CBA
FSR+
FSR± O6
E F
A21
Service Wire
DI±1324
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1518 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check airbag sensor assembly communication circuit (short to B+).
PREPARATION:
(a) Disconnect the connector from the occupant classifica-
tion ECU.
(b) Connect the negative (±) terminal cable to the battery.
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
A21±16 (FSR+) ±
Body groundIgnition switch ONBelow 1 V
A21±24 (FSR±) ±
Body groundIgnition switch ONBelow 1 V
NG Go to step 13.
OK
5 Check airbag sensor assembly communication circuit (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 O6±8 (FSR+) and O6±4
(FSR±) of connector ºEº.
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
A21±16 (FSR+) ±
A21±24 (FSR±)AlwaysBelow 1 W
NG Go to step 14.
OK

C84205G27650H24003
Occupant
Classification ECUAirbag
Sensor
Assembly
D
A21
FSR±FSR+CBA
E F
C84205G27650H24003
Occupant
Classification ECUAirbag
Sensor
Assembly
D
A21
FSR±FSR+CBA
E F
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1325
1519 Author: Date:
2005 SEQUOIA (RM1146U)
6 Check airbag sensor assembly communication circuit (short).
PREPARATION:
Disconnect the service wire from connector ºEº.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
A21±16 (FSR+) ±
A21±24 (FSR±)Always1 MW or higher
NG Go to step 15.
OK
7 Check airbag sensor assembly communication circuit (short to ground).
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 16.
OK

DI±1326
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1520 Author: Date:
2005 SEQUOIA (RM1146U)
8 Check DTC.
PREPARATION:
(a) Connect the connectors to the occupant classification ECU and the airbag sensor assembly.
(b) Connect the negative (±) terminal cable to the battery.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page DI±1147).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand±held tester, check the DTCs of the occupant classification ECU (see page DI±1147).
OK:
DTC B1790 is not output.
HINT:
Codes other than DTC B1790 may be output at this time, but they are not related to this check.
NG Go to step 9.
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±1328
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1522 Author: Date:
2005 SEQUOIA (RM1146U)
12 Check DTC.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page DI±1147).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand±held tester, check the DTCs of the occupant classification ECU (see page DI±1147).
OK:
DTC B1790 is not output.
HINT:
Codes other than DTC B1790 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

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±1329
1523 Author: Date:
2005 SEQUOIA (RM1146U)
13 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.

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±1330
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1524 Author: Date:
2005 SEQUOIA (RM1146U)
14 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.
15 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±1331
1525 Author: Date:
2005 SEQUOIA (RM1146U)
16 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.

DI±1332
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1526 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1793 Occupant Classification Sensor Power
Supply Circuit Malfunction
CIRCUIT DESCRIPTION
The occupant classification sensor power supply circuit consists of the occupant classification ECU and the
occupant classification sensors.
DTC B1793 is recorded when a malfunction is detected in the occupant classification sensor power supply
circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1793

The occupant classification ECU receives a line short
circuit signal, an open circuit signal, a short circuit to
ground signal or a short circuit to B+ signal in the .

Occupant classification ECU malfunction
Front seat assembly RH (Occupant classification sensors)

Occupant classification ECU

Seat wire No. 1
HINT:
When DTC B1650/32 is detected as a result of troubleshooting for the supplemental restraint system, check
the DTCs stored in the occupant classification ECU. When DTC B1793 is output, perform troubleshooting
for the DTC.
DIDHE±01

H24041
Occupant
Classification ECU
O7 SVC111
1 O8
Occupant Classification
Sensor Front LH
V
O7 SVC212
O7 SVC35
O7 SVC46 P
Y±B
Y 1
1
1 O9
Occupant Classification
Sensor Front RH
O10
Occupant Classification
Sensor Rear LH
O11
Occupant Classification
Sensor Rear RHSVC1
SVC2
SVC3
SVC4
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1333
1527 Author: Date:
2005 SEQUOIA (RM1146U)
WIRING DIAGRAM

DI±1334
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1528 Author: Date:
2005 SEQUOIA (RM1146U)
INSPECTION PROCEDURE
HINT:

If troubleshooting (wire harness inspection) is difficult to perform, remove the passenger seat installa-
tion bolts to see the under surface of seat cushion.

In the above case, hold the seat so that it does not fall down. Holding the seat for a long period of time
may cause a problem, such as seat rail deformation. Hold the seat only as necessary.
1 Check DTC.
CHECK:
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page DI±1147).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assembly.
(c) Turn the ignition switch to the LOCK position.
(d) Turn the ignition switch to the ON position.
(e) Using the hand±held tester, check the DTCs of the occupant classification ECU (see page DI±1147).
OK:
DTC B1793 is not output.
HINT:
Codes other than DTC B1793 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).