o2 sensor TOYOTA HIGHLANDER 2001 Service Repair Manual
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Page 1048 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1475
1665 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
INSPECTION PROCEDURE
HINT:
If troubleshooting (wire harness inspection) is difficult to perform, remove the front RH seat assy instal-
lation 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
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(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 (see page 05-1215).
OK:
DTC B1783 is not output.
HINT:
Codes other than code B1783 may be output at this time, but they are not related to this check.
NG Go to step 2
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-1207)
2 CHECK CONNECTION OF CONNECTORS
(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) Check that the connectors are properly connected to the occupant classification ECU and the occu-
pant classification sensor rear RH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
Page 1049 of 2572
H43111H43105H43111H43105H43474
SGD4Front Seat Wire RH
CB DA
SIG4SVC4 Occupant
Classification
Sensor Rear RH
Occupant
Classification
ECU
O7
H43111H43106H43699H43111H43106H43699
B
H43475
Front Seat Wire RH
C DA
SIG4SVC4 SGD4Occupant
Classification
Sensor Rear RHOccupant
Classification
ECU
O7O11
SVC4
SIG4SGD4
Service Wire Service
Wire
05-1476
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1666 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK FRONT SEAT WIRE RH (TO B+)
(a) Disconnect the connectors from the occupant classifica-
tion ECU and the occupant classification sensor rear RH.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
O7-4 (SGD4) -
Body groundIgnition switch ONBelow 1 V
O7-6 (SVC4) -
Body groundIgnition switch ONBelow 1 V
O7-10 (SIG4) -
Body groundIgnition switch ONBelow 1 V
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
4 CHECK FRONT SEAT WIRE RH (OPEN)
(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), and connect 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.
(d) Measure the resistance according to the value(s) in the
table below.
Standard:
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 FRONT SEAT WIRE RH
OK
Page 1050 of 2572
H43111H43105H43111H43105H43474
SGD4Front Seat Wire RH
CB D
A
SIG4SVC4 Occupant
Classification
Sensor Rear RH
Occupant
Classification
ECU
O7
H43111H43105H43111H43105H43474
SGD4Front Seat Wire RH
CB D
A
SIG4SVC4 Occupant
Classification
Sensor Rear RH
Occupant
Classification
ECU
O7
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1477
1667 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
5 CHECK FRONT SEAT WIRE RH (SHORT)
(a) Disconnect the service wire from connector ºCº.
(b) Measure the resistance according to the value(s) in the
table below.
Standard:
Tester connectionConditionSpecified condition
O7-6 (SVC4) -
O7-4 (SGD4)Always1 MW or Higher
O7-10 (SIG4) -
O7-4 (SGD4)Always1 MW or Higher
O7-6 (SVC4) -
O7-10 (SIG4)Always1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
6 CHECK FRONT SEAT WIRE RH (TO GROUND)
(a) Measure the resistance according to the value(s) in the
table below.
Standard:
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 FRONT SEAT WIRE RH
OK
Page 1051 of 2572
05-1478
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1668 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 RECHECK DTC
(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.
(c) Turn the ignition switch to the ON position.
(d) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position.
(g) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1783 is not output.
HINT:
Codes other than code B1783 may be output at this time, but they are not related to this check.
NG Go to step 8
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-1207)
8 REPLACE OCCUPANT CLASSIFICATION ECU
(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 occupant classification ECU (see page 60-64).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
9 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 12
OK
Page 1052 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1479
1669 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
10 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 12
OK
11 RECHECK DTC
(a) Connect the negative (-) terminal cable to the battery.
(b) Turn the ignition switch to the ON position.
(c) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position.
(f) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1783 is not output.
HINT:
Codes other than code B1783 may be output at this time, but they are not related to this check.
NG Go to step 12
OK
END
12 REPLACE SEAT ADJUSTER FRAME ASSY
(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 adjuster frame assy (see page 72-1 1, 72-19).
13 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
Page 1054 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1481
1671 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 seat adjuster frame assy 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
Seat adjuster frame assy malfunction
Occupant classification ECU malfunction
Occupant classification sensor front LH sensed large loadOccupant classification ECU
Seat adjuster frame assy
(Occupant classification sensor front LH)
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for DTC B1785 of the classification system.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
WIRING DIAGRAM
see page 05-1453.
INSPECTION PROCEDURE
1 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 4
OK
2 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 4
OK
05IWV-01
Page 1055 of 2572
05-1482
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1672 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in airbag sensor assy center memory (see page 05-1215).
(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 (see page 05-1215).
OK:
DTC B1785 is not output.
HINT:
Codes other than code B1785 may be output at this time, but they are not related to this check.
NG Go to step 4
OK
END
4 REPLACE SEAT ADJUSTER FRAME ASSY
(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 adjuster frame assy (see page 72-1 1, 72-19).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
5 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 8
OK
6 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 8
OK
Page 1056 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1483
1673 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 CHECK DTC
(a) Connect the connectors to the occupant classification ECU and the occupant classification sensor
front LH.
(b) Connect the negative (-) terminal cable to the battery.
(c) Turn the ignition switch to the ON position.
(d) Clear the DTCs stored in memory (see page 05-1215).
HINT:
First clear DTCs stored in the occupant classification ECU memory and then in the airbag sensor assy
center memory.
Use the hand-held tester to clear the DTC of the occupant classification ECU, otherwise the DTC can-
not be cleared.
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position.
(g) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1785 is not output.
HINT:
Codes other than code B1785 may be output at this time, but they are not related to this check.
NG Go to step 8
OK
END
8 REPLACE OCCUPANT CLASSIFICATION ECU
(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 occupant classification ECU (see page 60-64).
9 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
10 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
END
Page 1057 of 2572
05-1484
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1674 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
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 seat adjuster frame assy 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
Seat adjuster frame assy malfunction
Occupant classification ECU malfunction
Occupant classification sensor front RH sensed large loadOccupant classification ECU
Seat adjuster frame assy
(Occupant classification sensor front RH)
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for DTC B1786 of the classification system.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
WIRING DIAGRAM
see page 05-1460.
INSPECTION PROCEDURE
1 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 4
OK
2 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 4
OK
05IWW-01
Page 1058 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1485
1675 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
3 CHECK DTC
(a) Turn the ignition switch to the ON position.
(b) Clear the DTCs stored in airbag sensor assy center memory (see page 05-1215).
(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 (see page 05-1215).
OK:
DTC B1786 is not output.
HINT:
Codes other than code B1786 may be output at this time, but they are not related to this check.
NG Go to step 4
OK
END
4 REPLACE SEAT ADJUSTER FRAME ASSY
(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 adjuster frame assy (see page 72-1 1, 72-19).
HINT:
Perform the inspection using parts from a normal vehicle when possible.
5 PERFORM ZERO POINT CALIBRATION
(a) Using the hand-held tester, perform ºZero point calibrationº (see page 05-1203).
OK:
The ºCOMPLETEDº is displayed.
NG Go to step 8
OK
6 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform ºSensitivity checkº (see page 05-1203).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NG Go to step 8
OK