O2 sensor TOYOTA SEQUOIA 2001 Service Repair Manual

H43111H43106H43699H23818
CB DA
Service
Wire
Occupant
Classification
Sensor Rear RHOccupant
Classification
ECU
SVC4 SGD4
SIG4
SIG4 SGD4
SVC4
Service Wire
Seat Wire No. 1
O7
O11
DI±1294
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1488 Author: Date:
2005 SEQUOIA (RM1146U)
4 Check seat wire No. 1 (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 O11±1 (SVC4) and O11±3
(SGD4), O11±2 (SIG4) and O11±3 (SGD4) 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
O7±6 (SVC4) ±
O7±4 (SGD4)AlwaysBelow 1 W
O7±10 (SIG4) ±
O7±4 (SGD4)AlwaysBelow 1 W
NG Repair or replace seat wire No. 1.
OK

H43111H43105H23817
CB DA
Occupant
Classification
Sensor Rear RH
SVC4 SGD4
SIG4
Occupant
Classification
ECU
Seat Wire No. 1
O7
H43111H43105H23817
CB DA
Occupant
Classification
Sensor Rear RH
SVC4 SGD4
SIG4
Occupant
Classification
ECU
Seat Wire No. 1
O7
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1295
1489 Author: Date:
2005 SEQUOIA (RM1146U)
5 Check seat wire No. 1 (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
O7±10 (SIG4) ±
O7±4 (SGD4)Always1 MW or higher
O7±6 (SVC4) ±
O7±4 (SGD4)Always1 MW or higher
O7±10 (SIG4) ±
O7±6 (SVC4)Always1 MW or higher
NG Repair or replace seat wire No. 1.
OK
6 Check seat wire No. 1 (short to ground).
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester ConnectionConditionSpecified Condition
O7±4 (SGD4) ±
Body groundAlways1 MW or higher
O7±6 (SVC4) ±
Body groundAlways1 MW or higher
O7±10 (SIG4) ±
Body groundAlways1 MW or higher
NG Repair or replace seat wire No. 1.
OK

DI±1296
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1490 Author: Date:
2005 SEQUOIA (RM1146U)
7 Check DTC.
PREPARATION:
(a) Connect the connectors to the occupant classification ECU and the occupant classification sensor rear
RH.
(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 B1783 is not output.
HINT:
Codes other than DTC B1783 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).

DI±1298
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1492 Author: Date:
2005 SEQUOIA (RM1146U)
11 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 B1783 is not output.
HINT:
Codes other than DTC B1783 may be output at this time, but they are not related to this check.
NG Go to step 12.
OK
END

DI±1300
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1494 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1785 Occupant Classification Sensor Front LH
Collision Detection
CIRCUIT DESCRIPTION
DTC B1785 is output when the occupant classification ECU receives a collision detection signal sent by the
occupant classification sensor front LH if an accident occurs.
DTC B1785 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual
accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is
not in a collision, DTC B1785 can be cleared by ºZero point calibrationº and ºSensitivity checkº.
Therefore, if DTC B1785 is output, first perform ºZero point calibrationº and ºSensitivity checkº.
DTC No.DTC Detecting ConditionTrouble Area
B1785

Front seat assembly RH malfunction

Occupant classification ECU malfunction

Occupant classification sensor front LH detects heavy
load.
Front seat assembly RH
(Occupant classification sensor front LH)

Occupant classification ECU
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 B1785 is output, perform troubleshooting
for the DTC.
WIRING DIAGRAM
See page DI±1260.
INSPECTION PROCEDURE
1 Perform zero point calibration.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Using the hand±held tester, perform ºZero point calibrationº (see page DI±1128).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 4.
OK
DIDH9±01

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1301
1495 Author: Date:
2005 SEQUOIA (RM1146U)
2 Perform sensitivity check.
Using the hand±held tester, perform ºSensitivity checkº (see page DI±1128).
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 4.
OK
3 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 B1785 is not output.
HINT:
Codes other than DTC B1785 may be output at this time, but they are not related to this check.
NG Go to step 4.
OK
END

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1303
1497 Author: Date:
2005 SEQUOIA (RM1146U)
7 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 B1785 is not output.
HINT:
Codes other than DTC B1785 may be output at this time, but they are not related to this check.
NG Go to step 8.
OK
END

± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
DI±1305
1499 Author: Date:
2005 SEQUOIA (RM1146U)
DTC B1786 Occupant Classification Sensor Front RH
Collision Detection
CIRCUIT DESCRIPTION
DTC B1786 is output when the occupant classification ECU receives a collision detection signal sent by the
occupant classification sensor front RH if an accident occurs.
DTC B1786 is also output when the front seat assembly RH is subjected to a strong impact, even if an actual
accident does not occur.
However, when the occupant classification ECU outputs a collision detection signal, even if the vehicle is
not in a collision, DTC B1786 can be cleared by ºZero point calibrationº and ºSensitivity checkº.
Therefore, if DTC B1786 is output, first perform ºZero point calibrationº and ºSensitivity checkº.
DTC No.DTC Detecting ConditionTrouble Area
B1786

Front seat assembly RH malfunction

Occupant classification ECU malfunction

Occupant classification sensor front RH detects heavy
load.
Front seat assembly RH
(Occupant classification sensor front RH)

Occupant classification ECU
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 B1786 is output, perform troubleshooting
for the DTC.
WIRING DIAGRAM
See page DI±1270.
INSPECTION PROCEDURE
1 Perform zero point calibration.
(a) Connect the hand±held tester to the DLC3.
(b) Turn the ignition switch to the ON position.
(c) Using the hand±held tester, perform ºZero point calibrationº (see page DI±1128).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 4.
OK
DIDHA±01

DI±1306
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1500 Author: Date:
2005 SEQUOIA (RM1146U)
2 Perform sensitivity check.
Using the hand±held tester, perform ºSensitivity checkº (see page DI±1128).
OK:
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 4.
OK
3 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 B1786 is not output.
HINT:
Codes other than DTC B1786 may be output at this time, but they are not related to this check.
NG Go to step 4.
OK
END

DI±1308
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1502 Author: Date:
2005 SEQUOIA (RM1146U)
7 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 B1786 is not output.
HINT:
Codes other than DTC B1786 may be output at this time, but they are not related to this check.
NG Go to step 8.
OK
END