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05-1038
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05IWP-04
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 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 front LH)
B1780
sensor front LH circuit for 2 seconds. S Front seat wire RH
S Occupant classification sensor front 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 the DTC B1780 of the occupant classification system.
WIRING DIAGRAM
O5 Occupant Classification Sensor Front LH Occupant Classification ECU
11
V
O4 SVC1
1
7
G
O4 SIG1
2
1
O
O4 SGD1
3
H43062
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1221
05-1039
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 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 05-770 )
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 front LH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1222
05-1040
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 CHECK FRONT SEAT WIRE RH(TO B+)
Occupant (a) Disconnect the connectors from the occupant classifica-
Occupant
Classification ECU tion ECU and the occupant classification sensor front LH.
Classification
(b) Connect the negative (-) terminal cable to the battery.
Sensor Front LH
(c) Turn the ignition switch to the ON position.
(d) Measure the voltage according to the value(s) in the table
D A below.
C B Standard:
Front Seat Tester connection Condition Specified condition
Wire RH O4
O4-1 (SGD1) -
SGD1 Body ground
Ignition switch ON Below 1 V
O4-7 (SIG1) -
Ignition switch ON Below 1 V
Body ground
O4-1 1 (SVC1) -
SIG1 Ignition switch ON Below 1 V
SVC1 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 Front LH Classification tery, and wait for at least 90 seconds.
ECU (c) Using a service wire, connect O5-1 (SVC1) and O5-3
D A (SGD1), and connect O5-2 (SIG1) and O5-3 (SGD1) of
C B connector "C".
NOTICE:
O5
Service Wire Do not forcibly insert a service wire into the terminals of the
SGD1 O4 connector when connecting.
(d) Measure the resistance according to the value(s) in the
SVC1 SGD1 table below.
Standard:
SIG1 SIG1 SVC1 Tester connection Condition Specified condition
H43106 Service Wire
H43699 H43111 H43475 O4-7 (SIG1) -
Always Below 1
O4-1 (SGD1)
O4-1 1 (SVC1) -
Always Below 1
O4-1 (SGD1)
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1223
05-1041
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 CHECK FRONT SEAT WIRE RH(SHORT)
Occupant (a) Disconnect the service wire from connector "C".
Occupant
Classification Classification ECU (b) Measure the resistance according to the value(s) in the
Sensor Front LH table below.
Standard:
Tester connection Condition Specified condition
D A
O4-7 (SIG1) -
Always 1 M or Higher
C B O4-1 (SGD1)
Front Seat O4-1 1 (SVC1) -
Always 1 M or Higher
Wire RHSGD1 O4 O4-1 (SGD1)
O4-7 (SIG1) -
Always 1 M or Higher
O4-1 1 (SVC1)
SIG1
H43105 SVC1
H43111 H43474 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
6 CHECK FRONT SEAT WIRE RH(TO GROUND)
Occupant (a) Measure the resistance according to the value(s) in the
Occupant
Classification Classification ECU table below.
Sensor Front LH Standard:
Tester connection Condition Specified condition
O4-1 (SGD1) -
D A Body ground
Always 1 M or Higher
C B O4-7 (SIG1) -
Always 1 M or Higher
Body ground
Front Seat
O4 O4-1 1 (SVC1) -
Wire RH SGD1 Always 1 M or Higher
Body ground
SIG1
H43105 SVC1
H43111 H43474 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1224
05-1042
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
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 05-777 ).
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 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 05-770 )
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 : 1225
05-1043
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 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
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1226
05-1044
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 : 1227
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