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05-1032
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05IWO-03
DTC B1771 PASSENGER SIDE BUCKLE SWITCH
CIRCUIT MALFUNCTION
CIRCUIT DESCRIPTION
The passenger side buckle switch circuit consists of the occupant classification ECU and the front seat inner
belt assy RH (buckle switch RH).
DTC B1771 is recorded when a malfunction is detected in the passenger side buckle switch circuit.
Troubleshoot DTC B1771 first when the DTC B1771 and B1795 are output simultaneously.
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 Front seat inner belt assy RH (Buckle switch RH)
or a short circuit to B+ signal in the passenger side buckle
B1771 S Front seat wire RH
switch circuit for 2 seconds.
S Occupant classification ECU
S Passenger side buckle switch malfunction
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 B1771 of the occupant classification system.
WIRING DIAGRAM
B17 Occupant Classification ECU
Buckle SW RH
9
R
O3 BSW
2
5
L
O3 BGND
1
H43432
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1215
05-1033
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 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 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 front
seat inner belt assy RH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1216
05-1034
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 CHECK FRONT SEAT WIRE RH(TO B+)
Occupant (a) Disconnect the connectors from the occupant classifica-
Front Seat Wire RH
Classification ECU tion ECU and the front seat inner belt assy RH.
(b) Connect the negative (-) terminal cable to the battery.
D A (c) Turn the ignition switch to the ON position.
C B (d) Measure the voltage according to the value(s) in the table
Front Seat Inner below.
Belt Assy RH Standard:
BGND Tester connection Condition Specified condition
O3
O3-9 (BSW) -
Ignition switch ON Below 1 V
Body ground
O3-5 (BGND) -
Ignition switch ON Below 1 V
Body ground
BSW
H43103
H43111 H43130 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
4 CHECK FRONT SEAT WIRE RH(OPEN)
Front Seat Wire RH Occupant (a) Turn the ignition switch to the LOCK position.
Classification ECU (b) Disconnect the negative (-) terminal cable from the bat-
tery, and wait for at least 90 seconds.
D A
(c) Using a service wire, connect B17-1 and B17-2 of con-
C B nector "C".
Front Seat Inner
NOTICE:
Belt Assy RH
Do not forcibly insert a service wire into the terminals of the
B17 connector when connecting.
O3 BGND
(d) Measure the resistance according to the value(s) in the
table below.
1 2 Standard:
Tester connection Condition Specified condition
O3-9 (BSW) -
H43104 Service Wire BSW Always Below 1
O3-5 (BGND)
H43698 H43111 H43418
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1217
05-1035
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 CHECK FRONT SEAT WIRE RH(SHORT)
Occupant (a) Disconnect the service wire from connector "C".
Front Seat Wire RH
Classification ECU (b) Measure the resistance according to the value(s) in the
table below.
D A Standard:
C B Tester connection Condition Specified condition
Front Seat Inner O3-9 (BSW) -
Always 1 M or Higher
Belt Assy RH O3-5 (BGND)
BGND
O3
BSW
H43103
H43111 H43130 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
Front Seat Wire RH
Classification ECU table below.
Standard:
D A Tester connection Condition Specified condition
C B O3-9 (BSW) -
Always 1 M or Higher
Body ground
Front Seat Inner
Belt Assy RH O3-5 (BGND) -
Always 1 M or Higher
Body ground
BGND
O3
BSW
H43103
H43111 H43130 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1218
05-1036
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
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 05-777 ).
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 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 05-770 )
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 72-30 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
(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 05-777 ).
HINT:
First clear DTCs stored in the occupant classification ECU and then in the airbag sensor assy center.
(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 05-777 ).
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
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1219
05-1037
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
9 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 ).
NEXT
10 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
11 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 : 1220
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