Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Toyota Sienna 2004-2007 Approved SRM 04 05 21q2h73z b115325
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05-929
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05NT0-01
DTC B1153/25 SEAT POSITION AIRBAG SENSOR
MALFUNCTION
CIRCUIT DESCRIPTION
The seat position airbag sensor circuit consists of the airbag sensor assy center and the seat position airbag
sensor.
DTC B1153/25 is recorded when a malfunction is detected in the seat position airbag sensor 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 Seat position airbag sensor
nal or a short circuit to B+ signal in the seat position airbag
B1153/25 S Airbag sensor assy center
sensor circuit for 2 seconds.
S Floor wire
S Seat position airbag sensor malfunction
S Airbag sensor assy center malfunction
WIRING DIAGRAM
B18
Buckle SW LH
Seat Position Sensor G-R Airbag Sensor Assy Center
(*4)
2 4 3
G-R G-R
VS BL3 A20 A20 LSP+
2 (*3) (*3)
(*1) (*2)
G-B
(*4)
4 3 8
G-B G-B
GND BL3 A20 A20 LSP-
4 (*3) (*3)
(*1) (*2)
*1: w/ Side Airbag
*2 w/o Side Airbag
*3: w/ Power Seat
*4: w/o Power Seat
H45982
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1112
05-930
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
Seat least 60 seconds.
Position (b) Clear the DTCs stored in memory (see page 05-777 ).
Airbag
Airbag (c) Turn the ignition switch to the LOCK position.
Sensor
Sensor Assy
(d) Turn the ignition switch to the ON position and wait for at
Center least 60 seconds.
w/ Power Seat: (e) Check the DTCs (see page 05-777 ).
Seat OK:
Position DTC B1153/25 is not output.
Airbag
Airbag HINT:
Sensor
Sensor Codes other than code B1153/25 may be output at this time, but
Assy
they are not related to this check.
Center
DLC3 DTC B1153/25
C85269 CG TC
C84216
H10600 C91522 H46320 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 seat posi-
tion airbag sensor.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1113
05-931
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
3 CHECK VEHICLE TYPE
(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
Seat
D
center and the seat position airbag sensor.
Position (b) Using a service wire, connect B18-2 and B18-4 of con-
A Airbag
Airbag
Sensor nector "C".
Sensor C B
Assy NOTICE:
Center Do not forcibly insert a service wire into the terminals of the
connector when connecting.
A20 (*1) (c) Measure the resistance according to the value(s) in the
B18 LSP- table below.
2
Standard:
LSP+
Tester connection Condition Specified condition
A20-4 (LSP+) -
Always Below 1
A20-3 (LSP-) (*1)
A20 (*2) LSP+ A20-3 (LSP+) -
Always Below 1
A20-8 (LSP-) (*2)
4
Service Wire *1: w/ Side airbag
*1: w/ Side Airbag *2: w/o Side airbag
*2: w/o Side Airbag
LSP-
H43342
H42459 H46321 NG REPAIR OR REPLACE FLOOR WIRE
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1114
05-932
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
5 CHECK FLOOR WIRE(TO B+)
(a) Disconnect the service wire from connector "C".
Floor Wire
(b) Connect the negative (-) terminal cable to the battery,
A Airbag
and wait for at least 2 seconds.
D
(c) Turn the ignition switch to the ON position.
C B Sensor
Assy (d) Measure the voltage according to the value(s) in the table
Seat Position
Center below.
Airbag Sensor
Standard:
A20 LSP- A20 w/ Curtain shield airbag:
LSP+ LSP+ Tester connection Condition Specified condition
LSP- A20-4 (LSP+) -
Ignition switch ON Below 1 V
Body ground (*1)
A20-3 (LSP-) -
Ignition switch ON Below 1 V
Body ground (*1)
A20-3 (LSP+) -
w/o Side Airbag w/ Side Airbag H42459 Ignition switch ON Below 1 V
Body ground (*2)
A20-8 (LSP-) -
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)
(a) Turn the ignition switch to the LOCK position.
Floor Wire
(b) Disconnect the negative (-) terminal cable from the bat-
A Airbag tery, and wait for at least 90 seconds.
D
(c) Measure the resistance according to the value(s) in the
C B Sensor
Assy table below.
Seat Position
Center Standard:
Airbag Sensor
Tester connection Condition Specified condition
A20 LSP- A20 A20-4 (LSP+) -
LSP+ Always 1 M or Higher
LSP+ Body ground (*1)
A20-3 (LSP-) -
LSP- Body ground (*1)
Always 1 M or Higher
A20-3 (LSP+) -
Always 1 M or Higher
Body ground (*2)
A20-8 (LSP-) -
Always 1 M or Higher
w/o Side Airbag w/ 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 : 1115
05-933
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
7 CHECK FLOOR WIRE(SHORT)
(a) Measure the resistance according to the value(s) in the
Floor Wire
table below.
A Airbag
Standard:
D
Tester connection Condition Specified condition
C B Sensor
A20-4 (LSP+) -
Seat Position Assy Always 1 M or Higher
A20-3 (LSP-) (*1)
Airbag Sensor Center
A20-3 (LSP+) -
A20 Always 1 M or Higher
LSP- A20 A20-8 (LSP-) (*2)
LSP+ LSP+ *1: w/ Side airbag
*2: w/o Side airbag
LSP-
w/o Side Airbag w/ Side Airbag H42459 NG REPAIR OR REPLACE FLOOR WIRE
OK
8 CHECK SEAT POSITION AIR BAG SENSOR
(a) Connect the connectors to the seat position airbag sensor
and the airbag sensor assy center.
Seat
(b) Connect the negative (-) terminal cable to the battery,
Position
Airbag Airbag and wait for at least 2 seconds.
Sensor Sensor (c) Turn the ignition switch to the ON position, and wait for at
Assy least 60 seconds.
Center (d) Clear the DTCs stored in memory (see page 05-777 ).
DLC3 (e) Turn the ignition switch to the LOCK position.
DTC B1153/25
(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 B1153/25 is not output.
H01007 HINT:
H10600 C91522 H42468
Codes other than code B1153/25 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 : 1116
05-934
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
9 REPLACE SEAT POSITION AIR BAG SENSOR
(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 position airbag sensor (see page 60-64 ).
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.
Seat
(b) Turn the ignition switch to the ON position, and wait for at
Position
Airbag Airbag least 60 seconds.
Sensor Sensor (c) Clear the DTCs stored in memory (see page 05-777 ).
Assy (d) Turn the ignition switch to the LOCK position.
Center (e) Turn the ignition switch to the ON position, and wait for at
DLC3 least 60 seconds.
DTC B1153/25
(f) Check the DTCs (see page 05-777 ).
OK:
DTC B1153/25 is not output.
HINT:
CG TC
Codes other than code B1153/25 may be output at this time, but
H01007
H10600 C91522 H42468 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 : 1117
05-935
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
11 CHECK SEAT POSITION AIRBAG SENSOR 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:
Seat Position Assy
Do not forcibly insert a service wire into the terminals of the
Airbag Sensor Center
connector when connecting.
B18 A20 (*1) (c) Measure the resistance according to the value(s) in the
LSP+ table below.
2 LSP- Standard:
Tester connection Condition Specified condition
A20-4 (LSP+) -
Service Always Below 1
A20-3 (LSP-) (*1)
Wire
A20 (*2) A20-3 (LSP+) -
Always Below 1
4 A20-8 (LSP-) (*2)
LSP+
*1: w/ Side airbag
*1: w/ Side Airbag
*2: w/o Side Airbag
*2: w/o Side airbag
H43342 LSP-
H42459 H46322 NG Go to step 18
OK
12 CHECK SEAT POSITION AIRBAG SENSOR 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
Seat Position (d) Measure the voltage according to the value(s) in the table
Center
Airbag Sensor below.
Standard:
A20 (*2) LSP- A20 (*1) Tester connection Condition Specified condition
LSP+ A20-4 (LSP+) -
Ignition switch ON Below 1 V
Body ground (*1)
LSP+
A20-3 (LSP-) -
Ignition switch ON Below 1 V
Body ground (*1)
LSP- A20-3 (LSP+) -
Ignition switch ON Below 1 V
*1: w/ Side Airbag Body ground (*2)
H42237
H42459 *2: w/o Side Airbag H42824 A20-8 (LSP-) -
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 : 1118
05-936
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
13 CHECK SEAT POSITION AIRBAG SENSOR 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
Seat Position table below.
Center
Airbag Sensor Standard:
Tester connection Condition Specified condition
A20 (*2) LSP- A20 (*1) A20-19 (LSP+) -
Always 1 M or Higher
Body ground (*1)
LSP+
A20-2 (LSP-) -
LSP+ Always 1 M or Higher
Body ground (*1)
A20-11 (LSP+) -
Always 1 M or Higher
Body ground (*2)
LSP-
*1: w/ Side Airbag A20-6 (LSP-) -
H42237 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 POSITION AIRBAG SENSOR 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
Seat Position A20-19 (LSP+) -
Center A20-2 (LSP-) (*1)
Always 1 M or Higher
Airbag Sensor
A20-11 (LSP+) -
Always 1 M or Higher
A20-6 (LSP-) (*2)
A20 (*2) LSP- A20 (*1)
*1: w/ Side airbag
LSP+
*2: w/o Side airbag
LSP+
LSP-
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 : 1119
05-937
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
15 CHECK SEAT POSITION AIR BAG SENSOR
(a) Connect the connectors to the seat position airbag sensor
and the airbag sensor assy center.
(b) Connect the negative (-) terminal cable to the battery,
Airbag and wait for at least 2 seconds.
DC Sensor (c) Turn the ignition switch to the ON position, and wait for at
Assy
Seat Position least 60 seconds.
Airbag Sensor Center
(d) Clear the DTCs stored in memory (see page 05-777 ).
(e) Turn the ignition switch to the LOCK position.
DLC3 DTC B1153/25 (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 B1153/25 is not output.
C84216 HINT:
H41027 C91522 H46323
Codes other than code B1153/25 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 SEAT POSITION AIR BAG SENSOR
(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 position airbag sensor (see page 60-64 ).
HINT:
Perform the inspection using parts from a normal vehicle if possible.
NEXT
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1120
05-938
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
Seat Position (d) Turn the ignition switch to the LOCK position.
Airbag Sensor Center
(e) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
DLC3 DTC B1153/25 (f) Check the DTCs (see page 05-777 ).
OK:
DTC B1153/25 is not output.
HINT:
CG TC Codes other than code B1153/25 may be output at this time, but
C84216 they are not related to this check.
H41027 C91522 H46323
NG REPLACE AIR BAG SENSOR ASSY CENTER
(SEE PAGE 60-56 )
OK
END
18 CHECK FRONT SEAT WIRE LH (OPEN)
Seat Position Front Seat Wire LH (a) Disconnect the front seat wire LH connector from the floor
Airbag Sensor 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:
B18 2 Tester connection Condition Specified condition
BL3
BL3-2 - BL3-4 Always Below 1
4
H45992
Service Wire H46397 NG REPAIR OR REPLACE FRONT SEAT WIRE LH
OK
REPAIR OR REPLACE FLOOR WIRE
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1121
05-939
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
19 CHECK FRONT SEAT WIRE LH (TO B+)
Front Seat Wire LH
(a) Turn the ignition switch to the LOCK position.
(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,
Seat Position
Airbag Sensor 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
BL3-2 - Body ground Ignition switch ON Below 1 V
H03354
H45992 H46395 BL3-4 - Body ground Ignition switch ON Below 1 V
NG REPAIR OR REPLACE FRONT SEAT WIRE LH
OK
REPAIR OR REPLACE FLOOR WIRE
20 CHECK FRONT SEAT WIRE LH (TO GROUND)
Front Seat Wire LH
(a) Disconnect the front seat wire LH connector from the floor
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
Seat Position Tester connection Condition Specified condition
Airbag Sensor Center BL3-2 - Body ground Always 1 M or Higher
BL3-4 - Body ground 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 : 1122
05-940
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
21 CHECK FRONT SEAT WIRE LH (SHORT)
Front Seat Wire LH
(a) Disconnect the front seat wire LH connector from the floor
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
Seat Position Tester connection Condition Specified condition
Airbag Sensor Center
BL3-2 - BL3-4 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 : 1123
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