Page 1043 of 2572
H43111H43105H43111H43105H43474
SGD3Front Seat Wire RH
C
B D
A
SIG3SVC3 Occupant
Classification
Sensor Rear LH
Occupant
Classification
ECU
O7
H43111H43105H43111H43105H43474
SGD3Front Seat Wire RH
C
B D
A
SIG3SVC3 Occupant
Classification
Sensor Rear LH
Occupant
Classification
ECU
O7
05-1470
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1660 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
O7-5 (SVC3) -
O7-3 (SGD3)Always1 MW or Higher
O7-9 (SIG3) -
O7-3 (SGD3)Always1 MW or Higher
O7-5 (SVC3) -
O7-9 (SIG3)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 value(s) in the table
below.
Standard:
Tester connectionConditionSpecified condition
O7-3 (SGD3) -
Body groundAlways1 MW or Higher
O7-5 (SVC3) -
Body groundAlways1 MW or Higher
O7-9 (SIG3) -
Body groundAlways1 MW or Higher
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
Page 1044 of 2572
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05-1471
1661 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
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 B1782 is not output.
HINT:
Codes other than code B1782 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 1045 of 2572
05-1472
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1662 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 B1782 is not output.
HINT:
Codes other than code B1782 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 1047 of 2572
H43062
O11 Occupant Classification Sensor Rear RH
1
2
3V
B
BR6
10
4SVC4
SIG4
SGD4 Occupant Classification ECU
O7 O7 O7
SVC4
SIG4
SGD4 05-1474
- DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
1664 Author: Date:
2005 HIGHLANDER REPAIR MANUAL (RM1144U)
DTC B1783 OCCUPANT CLASSIFICATION SENSOR
REAR RH CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The occupant classification sensor rear RH circuit consists of the occupant classification ECU and the occu-
pant classification sensor rear RH.
DTC B1783 is recorded when a malfunction is detected in the occupant classification sensor rear RH circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1783
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 rear RH circuit for 2
seconds.
Occupant classification sensor rear RH malfunction
Occupant classification ECU malfunction
Seat adjuster frame assy
(Occupant classification sensor rear 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 B1783 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
05IWU-02
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