o2 sensor TOYOTA HIGHLANDER 2001 Service Repair Manual
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Page 1024 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1451
1641 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 RECHECK DTC
(a) Connect the connectors to the occupant classification ECU and the front seat inner belt assy 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 B1771 is not output.
HINT:
Codes other than code B1771 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 FRONT SEAT INNER BELT ASSY RH
(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 front seat inner belt assy RH (see page 72-1 1, 72-19).
(d) Connect the negative (-) terminal cable to the battery.
(e) Turn the ignition switch to the ON position.
(f) 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.
(g) Turn the ignition switch to the LOCK position.
(h) Turn the ignition switch to the ON position.
(i) Using the hand-held tester, check the DTCs (see page 05-1215).
OK:
DTC B1771 is not output.
HINT:
Codes other than code B1771 may be output at this time, but they are not related to this check.
NG Go to step 9
OK
END
Page 1026 of 2572
H43062
O7
2 1
SBR11
SVC1
SIG1
3G
SGD1 O7 O7 O8 Occupant Classification Sensor Front LH
Occupant Classification ECU
7
1 SVC1
SIG1
SGD1
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1453
1643 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1780 OCCUPANT CLASSIFICATION SENSOR
FRONT LH CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The occupant classification sensor front LH circuit consists of the occupant classification ECU and the occu-
pant classification sensor front LH.
DTC B1780 is recorded when a malfunction is detected in the occupant classification sensor front LH circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1780
When the occupant classification ECU receives a line short
signal, open signal, short to ground signal or B+ short signal
in the occupant classification sensor front LH circuit for 2
seconds.
Occupant classification sensor front LH malfunction
Occupant classification ECU malfunction
Seat adjuster frame assy
(Occupant classification sensor front LH)
Front seat wire RH
Occupant classification ECU
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for the DTC B1780 of the occupant classification system.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
WIRING DIAGRAM
05IWP-02
Page 1027 of 2572
05-1454
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1644 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 B1780 is not output.
HINT:
Codes other than code B1780 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 front LH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
Page 1028 of 2572
H43111H43105H43111H43105H43474
Occupant
Classification ECU
SIG1
SVC1
Occupant
Classification
Sensor Front LH
SGD1CB D
A
Front Seat
Wire RH
O7
H43111H43106H43699H43111H43106H43699
B
H43475
SGD1 Front Seat Wire RH
Occupant
Classification
ECU
C DA
SIG1
SVC1 SGD1
SIG1 SVC1
Occupant
Classification
Sensor Front LH
O7
O8
Service Wire
Service Wire
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1455
1645 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 front LH.
(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
O7-1 (SGD1) -
Body groundIgnition switch ONBelow 1 V
O7-7 (SIG1) -
Body groundIgnition switch ONBelow 1 V
O7-1 1 (SVC1) -
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 O8-1 (SVC1) and O8-3
(SGD1), and connect O8-2 (SIG1) and O8-3 (SGD1) 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
O7-7 (SIG1) -
O7-1 (SGD1)AlwaysBelow 1 W
O7-1 1 (SVC1) -
O7-1 (SGD1)AlwaysBelow 1 W
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
Page 1029 of 2572
H43111H43105H43111H43105H43474
SGD1 Front Seat
Wire RHOccupant
Classification ECU
CB D
A
SIG1
SVC1 Occupant
Classification
Sensor Front LH
O7
H43111H43105H43111H43105H43474
SGD1 Front Seat
Wire RHOccupant
Classification ECU
CB D
A
SIG1
SVC1 Occupant
Classification
Sensor Front LH
O7
05-1456
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1646 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
O7-7 (SIG1) -
O7-1 (SGD1)Always1 MW or Higher
O7-1 1 (SVC1) -
O7-1 (SGD1)Always1 MW or Higher
O7-7 (SIG1) -
O7-1 1 (SVC1)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
O7-1 (SGD1) -
Body groundAlways1 MW or Higher
O7-7 (SIG1) -
Body groundAlways1 MW or Higher
O7-1 1 (SVC1) -
Body groundAlways1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
Page 1030 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1457
1647 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
7 RECHECK 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 B1780 is not output.
HINT:
Codes other than code B1780 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 1031 of 2572
05-1458
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1648 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 B1780 is not output.
HINT:
Codes other than code B1780 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 1033 of 2572
H43062
Occupant Classification ECU
2 1
L W12
SVC2
SIG2
OO7
SGD2
3O7
O78
2 O9 Occupant classification Sensor Front RH
SVC2
SIG2
SGD2 05-1460
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1650 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1781 OCCUPANT CLASSIFICATION SENSOR
FRONT RH CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The occupant classification sensor front RH circuit consists of the occupant classification ECU and the occu-
pant classification sensor front RH.
DTC B1781 is recorded when a malfunction is detected in the occupant classification sensor front RH circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1781
When the occupant classification ECU receives a line short
signal, open signal, short to ground signal or B+ short signal
in the occupant classification sensor front RH circuit for 2
seconds.
Occupant classification sensor front RH malfunction
Occupant classification ECU malfunction
Seat adjuster frame assy
(Occupant classification sensor front RH)
Front seat wire RH
Occupant classification ECU
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system,
perform troubleshooting for DTC B1781 of the occupant classification system.
Use the hand-held tester to check the DTC of the occupant classification ECU, otherwise the DTC
cannot be read.
WIRING DIAGRAM
05IWR-02
Page 1034 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1461
1651 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 B1781 is not output.
HINT:
Codes other than code B1781 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 front RH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
Page 1035 of 2572
H43111H43105H43111H43105H43474
SGD2 Front Seat
Wire RHOccupant
Classification ECU
CB DA
SIG2
SVC2 Occupant
Classification
Sensor Front RH
O7
H43111H43106H43699H43111H43106H43699
B
H43475
Front Seat Wire RH
C D
A
SIG2SVC2 SGD2Occupant
Classification
Sensor Front RHOccupant
Classification
ECU
O7O9
SIG2SGD2
SVC2
Service
Wire
Service
Wire
05-1462
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1652 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 front 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
O7-2 (SGD2) -
Body groundIgnition switch ONBelow 1 V
O7-8 (SIG2) -
Body groundIgnition switch ONBelow 1 V
O7-12 (SVC2) -
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 O9-1 (SVC2) and O9-3
(SGD2), and connect O9-2 (SIG2) and O9-3(SGD2) 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
O7-8 (SIG2) -
O7-2 (SGD2)AlwaysBelow 1 W
O7-12 (SVC2) -
O7-2 (SGD2)AlwaysBelow 1 W
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK