Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z b012627
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05-848
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05NSW-01
DTC B0126/27 SEAT BELT BUCKLE SWITCH (LH)
MALFUNCTION
CIRCUIT DESCRIPTION
The seat belt buckle switch LH circuit consists of the airbag sensor assy center and the front seat inner belt
assy LH.
DTC B0126/27 is recorded when a malfunction is detected in the seat belt buckle switch LH circuit.
DTC No. DTC Detecting Condition Trouble Area
S The airbag sensor assy center receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig- S Front seat inner belt assy LH
nal or a short circuit to B+ signal in the seat belt buckle S Airbag sensor assy center
B0126/27
switch LH circuit for 2 seconds. S Floor wire
S Front seat inner belt assy LH malfunction S Seat wire No.2 (w/ Power seat)
S Airbag sensor assy center malfunction
WIRING DIAGRAM
B18
Buckle SW LH Airbag Sensor
Seat Position Sensor G-Y Assy Center
(*4)
5 19 11
G-Y G-Y
BL3 A20 A20 LBE+
1 (*3) (*3)
(*1) (*2)
G-W
(*4)
1 2 6
G-W G-W
BL3 A20 A20 LBE-
3 (*3) (*3)
(*1) (*2)
*1: w/ Side Airbag
*2: w/o Side Airbag
*3: w/ Power Seat
*4: w/o Power Seat
H45997
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1031
05-849
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 CHECK DTC
w/o Power Seat:
(a) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Airbag (b) Clear the DTCs stored in memory (see page 05-777 ).
Sensor (c) Turn the ignition switch to the LOCK position.
Assy (d) Turn the ignition switch to the ON position and wait for at
Front Seat Inner
Center least 60 seconds.
Belt Assy LH
w/ Power Seat: (e) Check the DTCs (see page 05-777 ).
OK:
DTC B0126/27 is not output.
Airbag HINT:
Sensor Codes other than code B0126/27 may be output at this time, but
Front Seat Inner Assy they are not related to this check.
Belt Assy LH Center
DLC3
DTC B0126/27
CG TC
C85269
C84216
H10600 C85273 H45958 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 airbag sensor assy center and the front seat
inner belt assy LH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1032
05-850
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 CHECK VEHICLE
(a) Check the front driver seat type.
RESULT:
w/o Power seat A
w/ Power seat B
B Go to step 11
A
4 CHECK FLOOR WIRE(OPEN)
(a) Disconnect the connectors from the airbag sensor assy
Floor Wire
center and the front seat inner belt assy LH.
D A Airbag (b) Using a service wire, connect B18-1 and B18-3 of con-
Sensor nector "C".
C B
Assy NOTICE:
Front Seat Inner
Belt Assy LH
Center Do not forcibly insert a service wire into the terminal of the
connector when connecting.
Service Wire A20
B18 LBE- (c) Measure the resistance according to the value(s) in the
1 (*1)
table below.
Standard:
Tester connection Condition Specified condition
A20-19 (LBE+) -
Always Below 1
A20-2 (LBE-) (*1)
3 LBE+
LBE- A20-11 (LBE+) -
Always Below 1
A20 A20-6 (LBE-) (*2)
*1: w/ Side Airbag (*2) *1: w/ Side airbag
*2: w/o Side Airbag *2: w/o Side airbag
H43342 LBE+ NG REPAIR OR REPLACE FLOOR WIRE
H42459 H44468
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1033
05-851
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 CHECK FLOOR WIRE(TO B+)
Floor Wire No.2 (a) Disconnect the service wire from connector "C".
(b) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
D A Airbag
Sensor (c) Turn the ignition switch to the ON position.
C B
Assy (d) Measure the voltage according to the value(s) in the table
Front Seat Inner
Center below.
Belt Assy LH
Standard:
(*1)
LBE- A20 A20 LBE- Tester connection Condition Specified condition
(*2) LBE+ A20-19 (LBE+) -
Ignition switch ON Below 1 V
Body ground (*1)
A20-2 (LBE-) -
Ignition switch ON Below 1 V
Body ground (*1)
A20-11 (LBE+) -
Ignition switch ON Below 1 V
LBE+ *1: w/ Side Airbag Body ground (*2)
*2: w/o Side Airbag H42459 A20-6 (LBE-) -
Ignition switch ON Below 1 V
Body ground (*2)
*1: w/ Side airbag
*2: w/o Side airbag
NG REPAIR OR REPLACE FLOOR WIRE
OK
6 CHECK FLOOR WIRE(TO GROUND)
Floor Wire No.2 (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.
D A Airbag
Sensor (c) Measure the resistance according to the value(s) in the
C B
Assy table below.
Front Seat Inner
Center Standard:
Belt Assy LH
(*1) Tester connection Condition Specified condition
LBE- A20 A20 LBE- A20-19 (LBE+) -
Always 1 M or Higher
LBE+ Body ground (*1)
(*2)
A20-2 (LBE-) -
Always 1 M or Higher
Body ground (*1)
A20-11 (LBE+) -
Always 1 M or Higher
Body ground (*2)
LBE+ *1: w/ Side Airbag A20-6 (LBE-) -
Always 1 M or Higher
*2: w/o Side Airbag H42459 Body ground (*2)
*1: w/ Side airbag
*2: w/o Side airbag
NG REPAIR OR REPLACE FLOOR WIRE
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1034
05-852
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 CHECK FLOOR WIRE(SHORT)
Floor Wire No.2 (a) Measure the resistance according to the value(s) in the
table below.
Standard:
D A Airbag
C Sensor Tester connection Condition Specified condition
B
Assy A20-19 (LBE+) -
Front Seat Inner A20-2 (LBE-) (*1)
Always 1 M or Higher
Center
Belt Assy LH A20-11 (LBE+) -
(*1) Always 1 M or Higher
A20-6 (LBE-) (*2)
LBE- A20 A20 LBE-
LBE+ *1: w/ Side airbag
(*2)
*2: w/o Side airbag
LBE+ *1: w/ Side Airbag
*2: w/o Side Airbag H42459 NG REPAIR OR REPLACE FLOOR WIRE
OK
8 CHECK FRONT SEAT INNER BELT ASSY RH
(a) Connect the connectors to the front seat inner belt assy
LH and the airbag sensor assy center.
Airbag (b) Connect the negative (-) terminal cable to the battery,
Sensor and wait for at least 2 seconds.
Assy (c) Turn the ignition switch to the ON position, and wait for at
Front Seat Inner
Center least 60 seconds.
Belt Assy LH
(d) Clear the DTCs stored in memory (see page 05-777 ).
(e) Turn the ignition switch to the LOCK position.
DLC3 DTC B0126/27 (f) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(g) Check the DTCs (see page 05-777 ).
OK:
CG TC DTC B0126/27 is not output.
C85269
H10600 C85273 H41027 HINT:
Codes other than code B0126/27 may be output at this time, but
they are not related to this check.
NG Go to step 9
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1035
05-853
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
9 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 LH (see page 72-12 , 72-22 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
10 CHECK AIR BAG SENSOR ASSY CENTER
(a) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
Airbag (b) Turn the ignition switch to the ON position, and wait for at
Sensor least 60 seconds.
Assy (c) Clear the DTCs stored in memory (see page 05-777 ).
Front Seat Inner
Center (d) Turn the ignition switch to the LOCK position.
Belt Assy LH
(e) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
DLC3 DTC B0126/27 (f) Check the DTCs (see page 05-777 ).
OK:
DTC B0126/27 is not output.
HINT:
CG TC Codes other than code B0126/27 may be output at this time, but
C85269
H10600 C85273 H41027 they are not related to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-56 )
OK
END
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1036
05-854
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
11 CHECK SEAT BELT BUCKLE SWITCH LH CIRCUIT(OPEN)
(a) Disconnect the connectors from the airbag sensor assy
center and the front seat inner belt assy LH.
(b) Using a service wire, connect B18-1 and B18-3 of con-
F A Airbag nector "E".
E DC B Sensor
NOTICE:
Assy
Front Seat Inner Do not forcibly insert a service wire into the terminals of the
Center
Belt Assy LH connector when connecting.
A20
B18 LBE- (c) Measure the resistance according to the value(s) in the
1 (*1)
table below.
Standard:
Tester connection Condition Specified condition
A20-19 (LBE+) -
Always Below 1
A20-2 (LBE-) (*1)
3 LBE+
LBE- A20-11 (LBE+) -
Always Below 1
Service Wire A20 A20-6 (LBE-) (*2)
*1: w/ Side Airbag (*2) *1: w/ Side airbag
*2: w/o Side Airbag *2: w/o Side airbag
H43342 LBE+
H42459 H45959 NG Go to step 18
OK
12 CHECK SEAT BELT BUCKLE SWITCH LH CIRCUIT(TO B+)
(a) Disconnect the service wire from connector "C".
(b) Connect the negative (-) terminal cable to the battery,
F A Airbag and wait for at least 2 seconds.
Sensor (c) Turn the ignition switch to the ON position.
E DC B
Assy
Front Seat Inner (d) Measure the voltage according to the value(s) in the table
Center
Belt Assy LH below.
(*1)
Standard:
LBE- A20 A20 LBE- Tester connection Condition Specified condition
(*2) LBE+ A20-19 (LBE+) -
Ignition switch ON Below 1 V
Body ground (*1)
A20-2 (LBE-) -
Ignition switch ON Below 1 V
Body ground (*1)
A20-11 (LBE+) -
LBE+ Body ground (*2)
Ignition switch ON Below 1 V
H42237 *1: w/ Side Airbag
H42459 *2: w/o Side Airbag H42824 A20-6 (LBE-) -
Ignition switch ON Below 1 V
Body ground (*2)
*1: w/ Side airbag
*2: w/o Side airbag
NG Go to step 19
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1037
05-855
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
13 CHECK SEAT BELT BUCKLE SWITCH LH CIRCUIT(TO GROUND)
(a) Turn the ignition switch to the LOCK position.
(b) Disconnect the negative (-) terminal cable from the bat-
F A Airbag tery, and wait for at least 90 seconds.
Sensor (c) Measure the resistance according to the value(s) in the
E DC B
Assy
Front Seat Inner table below.
Center
Belt Assy LH Standard:
(*1) Tester connection Condition Specified condition
A20 A20 LBE- A20-19 (LBE+) -
LBE- Always 1 M or Higher
LBE+ Body ground (*1)
(*2)
A20-2 (LBE-) -
Always 1 M or Higher
Body ground (*1)
A20-11 (LBE+) -
Always 1 M or Higher
Body ground (*2)
LBE+ A20-6 (LBE-) -
H42237 *1: w/ Side Airbag
Always 1 M or Higher
H42459 *2: w/o Side Airbag H42824 Body ground (*2)
*1: w/ Side airbag
*2: w/o Side airbag
NG Go to step 20
OK
14 CHECK SEAT BELT BUCKLE SWITCH LH CIRCUIT(SHORT)
(a) Measure the resistance according to the value(s) in the
table below.
F A Airbag Standard:
Sensor
E DC B Tester connection Condition Specified condition
Assy
Front Seat Inner A20-19 (LBE+) -
Center A20-2 (LBE-) (*1)
Always 1 M or Higher
Belt Assy LH
A20-11 (LBE+) -
(*1) Always 1 M or Higher
A20-6 (LBE-) (*2)
LBE- A20 A20 LBE-
LBE+ *1: w/ Side airbag
(*2)
*2: w/o Side airbag
LBE+
H42237 *1: w/ Side Airbag
H42459 *2: w/o Side Airbag H42824 NG Go to step 21
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1038
05-856
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
15 CHECK FRONT SEAT INNER BELT ASSY LH
(a) Connect the connectors to the front seat inner belt assy
LH and the airbag sensor assy center.
(b) Connect the negative (-) terminal cable to the battery,
Airbag and wait for at least 2 seconds.
Sensor (c) Turn the ignition switch to the ON position, and wait for at
Assy
Front Seat Inner least 60 seconds.
Belt Assy LH Center
(d) Clear the DTCs stored in memory (see page 05-777 ).
(e) Turn the ignition switch to the LOCK position.
DLC3 (f) Turn the ignition switch to the ON position, and wait for at
DTC B0126/27
least 60 seconds.
(g) Check the DTCs (see page 05-777 ).
OK:
CG TC DTC B0126/27 is not output.
C84216
H41027 H42825 HINT:
Codes other than code B0126/27 may be output at this time, but
they are not related to this check.
NG Go to step 16
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )
16 REPLACE FRONT SEAT INNER BELT ASSY LH
(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 LH (see page 72-12 , 72-22 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1039
05-857
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
17 CHECK AIR BAG SENSOR ASSY CENTER
(a) Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
(b) Turn the ignition switch to the ON position, and wait for at
Airbag least 60 seconds.
Sensor (c) Clear the DTCs stored in memory (see page 05-777 ).
Assy
Front Seat Inner (d) Turn the ignition switch to the LOCK position.
Belt Assy LH Center
(e) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
DLC3 (f) Check the DTCs (see page 05-777 ).
DTC B0126/27
OK:
DTC B0126/27 is not output.
HINT:
CG TC Codes other than code B0126/27 may be output at this time, but
C84216
H41027 H42825 they are not related to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-56 )
OK
END
18 CHECK FRONT SEAT WIRE LH(OPEN)
Front Seat Inner Front Seat Wire LH (a) Disconnect the front seat wire LH connector from the floor
Belt Assy LH wire.
Floor Wire
HINT:
F A Airbag The service wire has already been inserted into connector "E".
E D C B Sensor (b) Measure the resistance according to the value(s) in the
Assy table below.
Center Standard:
1 B18 Tester connection Condition Specified condition
BL3
BL3-5 - BL3-1 Always Below 1
3
Service Wire
H45991 H45992 H46394 NG REPAIR OR REPLACE FRONT SEAT WIRE LH
OK
REPAIR OR REPLACE FLOOR WIRE
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1040
05-858
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
19 CHECK FRONT SEAT WIRE LH(TO B+)
(a) Turn the ignition switch to the LOCK position.
Front Seat Wire LH
(b) Disconnect the negative (-) terminal cable from the bat-
Floor Wire
tery, and wait for at least 90 seconds.
F A Airbag (c) Disconnect the front seat wire LH connector from the floor
E D C B Sensor wire.
Assy (d) Connect the negative (-) terminal cable to the battery,
Front Seat Inner
Belt Assy LH Center and wait for at least 2 seconds.
(e) Turn the ignition switch to the ON position.
BL3 (f) Measure the voltage according to the value(s) in the table
below.
Standard:
Tester connection Condition Specified condition
BL3-5 -
H03354
Ignition switch ON Below 1 V
Body ground
H45992 H46395
BL3-1 -
Ignition switch ON Below 1 V
Body ground
NG REPAIR OR REPLACE FRONT SEAT WIRE LH
OK
REPAIR OR REPLACE FLOOR WIRE
20 CHECK FRONT SEAT WIRE LH(TO GROUND)
(a) Disconnect the front seat wire LH connector from the floor
Front Seat Wire LH
wire.
Floor Wire
(b) Measure the resistance according to the value(s) in the
F A Airbag table below.
E D C B Sensor Standard:
Assy
Front Seat Inner Tester connection Condition Specified condition
Belt Assy LH Center BL3-5 -
Always 1 M or Higher
Body ground
BL3 BL3-1 -
Always 1 M or Higher
Body ground
H03354
H45992 H46395
NG REPAIR OR REPLACE FRONT SEAT WIRE LH
OK
REPAIR OR REPLACE FLOOR WIRE
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1041
05-859
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
21 CHECK FRONT SEAT WIRE LH(SHORT)
(a) Disconnect the front seat wire LH connector from the floor
Front Seat Wire LH
wire.
Floor Wire
(b) Measure the resistance according to the value(s) in the
F A Airbag table below.
E D C B Sensor Standard:
Assy
Front Seat Inner Tester connection Condition Specified condition
Belt Assy LH Center
BL3-5 - BL3-1 Always 1 M or Higher
BL3
H03354
H45992 H46395 NG REPAIR OR REPLACE FRONT SEAT WIRE LH
OK
REPAIR OR REPLACE FLOOR WIRE
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1042
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