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05-1052
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05IWT-04
DTC B1782 OCCUPANT CLASSIFICATION SENSOR
REAR LH CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The occupant classification sensor rear LH circuit consists of the occupant classification ECU and the occu-
pant classification sensor rear LH.
DTC B1782 is recorded when a malfunction is detected in the occupant classification sensor rear LH circuit.
DTC No. DTC Detecting Condition Trouble Area
S The occupant classification ECU receives a line short circuit
signal, an open circuit signal, a short circuit to ground signal S Seat adjuster frame assy
or a short circuit to B+ signal in the occupant classification (Occupant classification sensor rear LH)
B1782
sensor rear LH circuit for 2 seconds. S Front seat wire RH
S Occupant classification sensor rear LH malfunction S Occupant classification ECU
S Occupant classification ECU malfunction
HINT:
When DTC B1150/23 is detected as a result of troubleshooting for the supplemental restraint system, per-
form troubleshooting for DTC B1782 of the occupant classification system.
WIRING DIAGRAM
O7 Occupant Classification Sensor Rear LH Occupant Classification ECU
5
Y-B
O4 SVC3
1
9
G-B
O4 SIG3
2
3
R-B
O4 SGD3
3
H43062
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1235
05-1053
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
HINT:
S 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.
S 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 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(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 05-777 ).
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 2
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )
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 LH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1236
05-1054
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 CHECK FRONT SEAT WIRE RH(TO B+)
(a) Disconnect the connectors from the occupant classifica-
Occupant Front Seat Wire RH tion ECU and the occupant classification sensor rear LH.
Classification
Occupant
(b) Connect the negative (-) terminal cable to the battery.
Sensor Rear LH
Classification (c) Turn the ignition switch to the ON position.
ECU (d) Measure the voltage according to the value(s) in the table
D A below.
C B Standard:
Tester connection Condition Specified condition
O4 SVC3
SGD3 O4-3 (SGD3) -
Ignition switch ON Below 1 V
Body ground
O4-5 (SVC3) -
Ignition switch ON Below 1 V
Body ground
O4-9 (SIG3) -
SIG3 Ignition switch ON Below 1 V
Body ground
H43105
H43111 H43474
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
4 CHECK FRONT SEAT WIRE RH(OPEN)
Occupant Front Seat Wire RH (a) Turn the ignition switch to the LOCK position.
Classification Occupant (b) Disconnect the negative (-) terminal cable from the bat-
Sensor Rear LH Classification tery, and wait for at least 90 seconds.
ECU
(c) Using a service wire, connect O7-1 (SVC3) and O7-3
D A (SGD3), and connect O7-2 (SIG3) and O7-3 (SGD3) of
C B connector "C".
NOTICE:
O7 O4
Service Do not forcibly insert a service wire into the terminals of the
Wire SGD3 SVC3 connector when connecting.
(d) Measure the resistance according to the value(s) in the
SVC3 SGD3 table below.
Standard:
SIG3 Service Tester connection Condition Specified condition
H43106
Wire SIG3 O4-5 (SVC3) -
H43699 H43111 H43475
Always Below 1
O4-3 (SGD3)
O4-9 (SIG3) -
Always Below 1
O4-3 (SGD3)
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1237
05-1055
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 CHECK FRONT SEAT WIRE RH(SHORT)
(a) Disconnect the service wire from connector "C".
Occupant Front Seat Wire RH (b) Measure the resistance according to the value(s) in the
Classification Occupant table below.
Sensor Rear LH Classification
Standard:
ECU
Tester connection Condition Specified condition
D A
O4-5 (SVC3) -
Always 1 M or Higher
C B O4-3 (SGD3)
O4-9 (SIG3) -
Always 1 M or Higher
O4 SVC3 O4-3 (SGD3)
SGD3
O4-5 (SVC3) -
Always 1 M or Higher
O4-9 (SIG3)
SIG3
H43105
H43111 H43474 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
Occupant Front Seat Wire RH table below.
Classification Occupant Standard:
Sensor Rear LH Classification
Tester connection Condition Specified condition
ECU
O4-3 (SGD3) -
D A Always 1 M or Higher
Body ground
C B O4-5 (SVC3) -
Always 1 M or Higher
Body ground
O4 SVC3 O4-9 (SIG3) -
SGD3 Always 1 M or Higher
Body ground
SIG3
H43105
H43111 H43474 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1238
05-1056
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
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 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(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 05-777 ).
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 05-770 )
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 60-67 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
9 PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the hand-held tester, perform "Zero point calibration" (see page 05-767 ).
OK:
The "COMPLETED" is displayed.
NG Go to step 12
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1239
05-1057
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
10 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform "Sensitivity check" (see page 05-767 ).
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 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(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 05-777 ).
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
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1240
05-1058
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
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 72-30 ).
NEXT
13 PERFORM ZERO POINT CALIBRATION
(a) Connect the negative (-) terminal cable to the battery.
(b) Connect the hand-held tester to the DLC3.
(c) Turn the ignition switch to the ON position.
(d) Using the hand-held tester, perform "Zero point calibration" (see page 05-767 ).
OK:
The "COMPLETED" is displayed.
NEXT
14 PERFORM SENSITIVITY CHECK
(a) Using the hand-held tester, perform "Sensitivity check" (see page 05-767 ).
Standard value: 27 to 33 kg (59.52 to 72.75 lb)
NEXT
END
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1241
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