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05-914
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM 05IVP-05
DTC B1150/23 OCCUPANT CLASSIFICATION SYSTEM
MALFUNCTION
CIRCUIT DESCRIPTION
The occupant classification system circuit consists of the airbag sensor assy center and the occupant classi-
fication system.
DTC B1150/23 is recorded when a malfunction is detected in the occupant classification system 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 Floor wire No.2
nal or a short circuit to B+ signal in the occupant classifi- S Front seat wire RH
B1150/23
cation system circuit for 2 seconds. S Occupant classification ECU
S Occupant classification system malfunction S Airbag sensor assy center
S Airbag sensor assy center malfunction
WIRING DIAGRAM
Occupant Airbag Sensor
Classification ECU Assy Center
8 3 1 3
G-R G-R
FSR+ O3 BO1 A22 A22 FSR+
(*3) (*3)
(*1) (*2)
3
G-R G-R
BM1
(*4) (*4)
4 5 2 10
FSR- G-B G-B
O3 BO1 A22 A22 FSR-
(*3) (*3)
(*1) (*2)
2
G-B G-B
BM1
(*4) (*4)
*1: w/ Side Airbag
*2: w/o Side Airbag
*3: w/ Power Seat
*4: w/o Power Seat
H45983
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1097
05-915
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
INSPECTION PROCEDURE
1 CHECK DTC(OCCUPANT CLASSIFICATION ECU)
(a) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(b) Using the hand-held tester, check the DTCs of the occupant classification ECU (see page 05-777 ).
OK:
DTC is not output.
NG GO TO INSPECTION PROCEDURE OF DTC
OUTPUT (SEE PAGE 05-790 )
OK
2 CHECK DTC(AIRBAG SENSOR ASSY CENTER)
(a) Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
Occupant
Airbag (b) Clear the DTCs stored in memory (see page 05-777 ).
Classification ECU
Sensor (c) Turn the ignition switch to the LOCK position.
Assy (d) Turn the ignition switch to the ON position, and wait for at
Center least 60 seconds.
(e) Check the DTCs (see page 05-777 ).
OK:
DTC B1150/23
DTC B1150/23 is not output.
DLC3
HINT:
Codes other than code B1150/23 may be output at this time, but
they are not related to this check.
CG TC
H44090 H02757
H10600 H44098 H44535 NG Go to step 3
OK
USE SIMULATION METHOD TO CHECK (SEE PAGE 05-770 )
3 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 occupant
classification ECU.
OK:
The connectors are connected.
NG CONNECT CONNECTORS, THEN GO TO STEP
1
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1098
05-916
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
4 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT(OPEN)
(a) Disconnect the connectors from the airbag sensor assy
Occupant
center and the occupant classification ECU.
Airbag (b) Using a service wire, connect O3-8 (FSR+) and O3-4
Classification ECU Sensor
(FSR-) of connector "E".
Assy
F A Center NOTICE:
E DC B Do not forcibly insert a service wire into the terminals of the
FSR+ connector when connecting.
FSR-
FSR+ (c) Measure the resistance according to the value(s) in the
table below.
FSR- Standard:
O3
Tester connection Condition Specified condition
FSR+ FSR-
A22-1 (FSR+) -
Always Below 1
A22-2 (FSR-) (*1)
A22 (*2) A22 (*1) A22-3 (FSR+) -
Always Below 1
A22-10 (FSR-) (*2)
Service Wire *1: w/ Side airbag
*1: w/ Side Airbag
*2: w/o Side airbag
*2: w/o Side Airbag
H44130 H44536
H41715 H43694 H44681 NG Go to step 8
OK
5 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (SHORT)
(a) Disconnect the service wire from connector "E".
Occupant
Airbag (b) Measure the resistance according to the value(s) in the
Classification ECU
Sensor table below.
Assy Standard:
F A Center
Tester connection Condition Specified condition
E DC B
A22-1 (FSR+) -
FSR- Always 1 M or Higher
A22-2 (FSR-) (*1)
FSR- A22 FSR+ A22 FSR+
A22-3 (FSR+) -
Always 1 M or Higher
A22-10 (FSR-) (*2)
*1: w/ Side airbag
*2: w/o Side airbag
w/o Side Airbag w/ Side Airbag
H41715 H44130 H44536
NG Go to step 9
OK
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1099
05-917
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
6 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (TO B+)
(a) Connect the negative (-) terminal cable to the battery,
Occupant and wait for at least 2 seconds.
Airbag
Classification ECU
Sensor (b) Turn the ignition switch to the ON position.
Assy (c) Measure the voltage according to the value(s) in the table
F A Center below.
E DC B
Standard:
FSR-
FSR- A22 FSR+ Tester connection Condition Specified condition
A22 FSR+
A22-1 (FSR+) -
Ignition switch ON Below 1 V
Body ground (*1)
A22-2 (FSR-) -
Ignition switch ON Below 1 V
Body ground (*1)
A22-3 (FSR+) -
Ignition switch ON Below 1 V
Body ground (*2)
w/o Side Airbag w/ Side Airbag A22-10 (FSR-) -
Ignition switch ON Below 1 V
H41715 H44130 H44536 Body ground (*2)
*1: w/ Side airbag
*2: w/o Side airbag
NG Go to step 10
OK
7 CHECK OCCUPANT CLASSIFICATION ECU CIRCUIT (TO GROUND)
(a) Turn the ignition switch to the LOCK position.
Occupant (b) Disconnect the negative (-) terminal cable from the bat-
Airbag
Classification ECU
Sensor tery, and wait for at least 90 seconds.
Assy (c) Measure the resistance according to the value(s) in the
F A Center table below.
E DC B
Standard:
FSR-
FSR- A22 FSR+ Tester connection Condition Specified condition
A22 FSR+
A22-1 (FSR+) -
Always 1 M or Higher
Body ground (*1)
A22-2 (FSR-) -
Always 1 M or Higher
Body ground (*1)
A22-3 (FSR+) -
Always 1 M or Higher
Body ground (*2)
w/o Side Airbag w/ Side Airbag A22-10 (FSR-) -
Always 1 M or Higher
H41715 H44130 H44536 Body ground (*2)
*1: w/ Side airbag
*2: w/o Side airbag
NG Go to step 11
OK
REPLACE AIR BAG SENSOR ASSY CENTER (SEE PAGE 60-56 )
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1100
05-918
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
8 CHECK FRONT SEAT WIRE RH(OPEN)
(a) Disconnect the front seat wire RH connector from the floor
Occupant Floor Wire No.2
Front Seat wire No.2.
Classification Wire RH Airbag HINT:
ECU Sensor
The service wire has already been inserted into connector "E".
Assy
(b) Measure the resistance according to the value(s) in the
F A Center
table below.
E D C B
BO1 (*1) Standard:
Tester connection Condition Specified condition
BO1-3 (FSR+) -
FSR+ Always Below 1
BO1-5 (FSR-) (*1)
FSR+ O3 FSR-
BM1-3 (FSR+) -
Always Below 1
BM1-2 (FSR-) (*2)
FSR- *1: w/ Power seat
BM1 (*2) *2: w/o Power seat
FSR- FSR+
Service Wire
*1: w/ Power Seat
*2: w/o Power Seat H45993 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE NO.2
9 CHECK FRONT SEAT WIRE RH(SHORT)
(a) Disconnect the front seat wire RH connector from the floor
Occupant Floor Wire No.2
Front Seat wire No.2.
Classification Wire RH Airbag (b) Measure the resistance according to the value(s) in the
ECU Sensor
table below.
Assy
Standard:
F A Center
Tester connection Condition Specified condition
E D C B
BO1-3 (FSR+) -
Always 1 M or Higher
BO1-5 (FSR-) (*1)
BM1 (*2)
BM1-3 (FSR+) -
BO1 (*1) FSR- FSR+ Always 1 M or Higher
BM1-2 (FSR-) (*2)
*1: w/ Power seat
FSR-
FSR+ *2: w/o Power seat
*1: w/ Power Seat
*2: w/o Power Seat H45994 NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE NO.2
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1101
05-919
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
10 CHECK FRONT SEAT WIRE RH(TO B+)
(a) Turn the ignition switch to the LOCK position.
Occupant Floor Wire No.2
Front Seat (b) Disconnect the negative (-) terminal cable from the bat-
Classification Wire RH Airbag tery, and wait for at least 90 seconds.
ECU Sensor
(c) Disconnect the front seat wire RH connector from the floor
Assy
wire No.2.
F A Center
(d) Connect the negative (-) terminal cable to the battery,
E D C B
and wait for at least 2 seconds.
BM1 (*2) (e) Turn the ignition switch to the ON position.
BO1 (*1) FSR- FSR+ (f) Measure the voltage according to the value(s) in the table
below.
FSR- Standard:
FSR+
Tester connection Condition Specified condition
BO1-3 (FSR+) -
*1: w/ Power Seat Ignition switch ON Below 1 V
*2: w/o Power Seat
Body ground (*1)
H45994
BO1-5 (FSR-) -
Ignition switch ON Below 1 V
Body ground (*1)
BM1-3 (FSR+) -
Ignition switch ON Below 1 V
Body ground (*2)
BM1-2 (FSR-) -
Ignition switch ON Below 1 V
Body ground (*2)
*1: w/ Power seat
*2: w/o Power seat
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE NO.2
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1102
05-920
DIAGNOSTICS - SUPPLEMENTAL RESTRAINT SYSTEM
11 CHECK FRONT SEAT WIRE RH(TO GROUND)
(a) Disconnect the front seat wire RH connector from the floor
Occupant Floor Wire No.2
Front Seat wire No.2.
Classification Wire RH Airbag (b) Measure the resistance according to the value(s) in the
ECU Sensor
table below.
Assy
Standard:
F A Center
Tester connection Condition Specified condition
E D C B
BO1-3 (FSR+) -
Always 1 M or Higher
Body ground (*1)
BM1 (*2)
BO1-5 (FSR-) -
BO1 (*1) FSR- FSR+ Always 1 M or Higher
Body ground (*1)
BM1-3 (FSR+) -
Always 1 M or Higher
FSR- Body ground (*2)
FSR+
BM1-2 (FSR-) -
Always 1 M or Higher
Body ground (*2)
*1: w/ Power Seat
*2: w/o Power Seat H45994 *1: w/ Power seat
*2: w/o Power seat
NG REPAIR OR REPLACE FRONT SEAT WIRE RH
OK
REPAIR OR REPLACE FLOOR WIRE NO.2
2005 SIENNA REPAIR MANUAL (RM1163U)
Author : Date : 1103
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