Page 1345 of 5135

H41028
Airbag
Sensor
Assy
Center
Seat Position
Airbag Sensor RSP±
RSP+Floor Wire No. 2
A
B
C
D
H42477
DLC3
CGTC DTC B1153/25
Airbag
Sensor
Assy
Center
Seat
Position
Airbag
Sensor
05±1310
±
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
12CHECK FLOOR WIRE NO.2(TO GROUND)
(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.
(c)Measure the resistance between the body ground and each of RSP+ and RSP± of the connector ºBº.
OK:
Resistance: 1 M or Higher
NGREPAIR OR REPLACE FLOOR WIRE NO.2
OK
13CHECK SEAT POSITION AIR BAG SENSOR
(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.
(c)Connect the connectors to the seat position airbag sensor and the airbag sensor assy center.
(d)Connect the negative (±) terminal cable to the battery, and wait for at least 2 seconds.
(e)Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(f)Clear the stored DTCs in the memory (See page 05±1184).
(g) Turn the ignition switch to the LOCK position.
(h) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(i)Check the DTCs (See page 05±1184). OK:
DTC B1153/25 is not output.
HINT:
Codes other than code B1153/25 may be output at this time, but
they are not related to this check.
NG Go to step 14
OK
USE SIMULATION METHOD TO CHECK
Page 1346 of 5135

H42477
DLC3
CGTC DTC B1153/25
Airbag
Sensor
Assy
Center
Seat
Position
Airbag
Sensor
±
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
05±1311
AVENSIS REPAIR MANUAL (RM1018E)
14REPLACE 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±70).
15 RECHECK DTC
(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 least 10 seconds.
(c)Clear the stored DTCs in the memory (See page
05±1184).
(d) Turn the ignition switch to the LOCK position.
(e) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(f)Check the DTCs (See page 05±1184). OK:
DTC B1153/25 is not output.
HINT:
Codes other than code B1153/25 may be output at this time, but
they are not related to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER
OK
USE SIMULATION METHOD TO CHECK
Page 1347 of 5135

H17182
Airbag Sensor Assy Center
SL+
SL± A27
A2715
26 IO3
4 3
2
1 SL+
SL± A9
Airbag Sensor Front LH
W±R
BR IE73
4
IO3 IE7
(*3) (*4)(*3) (*4)
BR (*2) Y±R (*1)
*1: LHD 1CD±FTV
*2: Except LHD 1CD±FTV W±R
*3: LHD
*4: RHD 05±1298
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B1149/37 FRONT AIRBAG SENSOR (LH)
MALFUNCTION
CIRCUIT DESCRIPTION
The airbag sensor front LH circuit consists of the diagnosis circuit and the frontal deceleration sensor, etc.
If the airbag sensor assy center receives signals from the frontal deceleration sensor, it judges whether or
not the SRS should be activated.
DTC B1149/37 is recorded when malfunction is detected in the airbag sensor front LH circuit.
DTC No.DTC Detecting ConditionTrouble Area
B1149/37
Open circuit in SL+ wire harness or SL± wire harness of air-
bag sensor front LH
Short circuit in airbag sensor front LH wire harness (to B+)
Short circuit in airbag sensor front LH wire harness (to
ground)
Airbag sensor front LH malfunction
Airbag sensor assy center malfunction
Airbag sensor front LH
Airbag sensor assy center
Instrument panel wire
Engine room main wire
WIRING DIAGRAM
05C61±01
Page 1348 of 5135

\b
\bH42119
Airbag
Sensor
Front LH Airbag
Sensor
Assy
Center
DLC3
CG TC DTC B1149/37
±
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
05±1299
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1CHECK DTC
(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.
(c)Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
(d)Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(e)Clear the stored DTCs in the memory (See page
05±1184).
(f) Turn the ignition switch to the LOCK position.
(g) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(h)Check the DTCs (See page 05±1184).
OK:
DTC B1149/37 is not output.
HINT:
Codes other than code B1149/37 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
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 airbag sensor front LH.
OK:
The connectors are connected.
NG CONNECT CONNECTORS
OK
Page 1349 of 5135

H42523
Airbag
Sensor
Assy
Center
Airbag Sensor
Front LH
Service Wire
SL+
SL±A
B
C
D E F
H42510
Airbag
Sensor
Assy
Center
Airbag Sensor
Front LH
SL+
SL±A
B C
D E F
05±1300
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK FRONT AIRBAG SENSOR (LH) CIRCUIT (OPEN)
(a) Disconnect the connectors from the airbag sensor assy
center and the airbag sensor front LH.
(b) Using a service wire, connect SL+ and SL± of the connec-
tor ºEº.
NOTICE:
Do not forcibly insert a service wire into the terminal of the
connector when connecting.
(c) Measure the resistance between SL+ and SL± of the con-
necter ºBº.
OK:
Resistance: Below 1
NG Go to step 7
OK
4 CHECK FRONT AIRBAG SENSOR (LH) CIRCUIT (TO B+)
(a) Disconnect the service wire from the connector ºEº.
(b) Connect the negative (±) terminal cable to the battery,
and turn the ignition switch to the ON position.
(c) Measure the voltage between the body ground and each
of SL+ and SL± of the connector ºBº.
OK:
Voltage: Below 1 V
NG Go to step 8
OK
Page 1350 of 5135

H42510
Airbag
Sensor
Assy
Center
Airbag Sensor
Front LH
SL+SL± A
B
C
D
E
F
\b\b
\b\b H42120
Airbag
Sensor
Assy
CenterAirbag
Front
RH Sensor
DLC3
CGTC DTC B1148/36
DTC B1149/37
DC
±
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
05±1301
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK FRONT AIRBAG SENSOR (LH) CIRCUIT (TO GROUND)
(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.
(c)Measure the resistance between the body ground and each of SL+ and SL± of the connector ºBº.
OK:
Resistance: 1 M or Higher
NGGo to step 9
OK
6CHECK AIR BAG SENSOR FRONT LH
(a)Connect the connector to the airbag sensor assy center.
(b)Interchange the airbag front sensor RH with the airbag sensor front LH and connect the connectors to them.
(c)Connect the negative (±) terminal cable to the battery, and wait for at least 2 seconds.
(d)Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(e)Clear the stored DTCs in the memory (See page 05±1184).
(f)Turn the ignition switch to the LOCK position.
(g)Turn the ignition switch to the ON position, and wait for at
least 10 seconds.
(h)Check the DTCs (See page 05±1184). OK:
A: DTC B1148/36 is not output.
B: DTC B1149/37 is not output.
NG:A REPLACE AIR BAG SENSOR ASSY CENTER
NG:B REPLACE AIR BAG SENSOR FRONT LH
OK
USE SIMULATION METHOD TO CHECK
Page 1351 of 5135

H42524
Engine Room
Main Wire
SL± SL+
Service Wire
Airbag
Sensor
Assy
Center
Airbag Sensor
Front LH
A
B C
D E FInstrument Panel Wire
SL±
SL+
H42512
Engine Room
Main Wire
SL± SL+Airbag
Sensor
Assy
Center
Airbag Sensor
Front LH
A
B C
D E FInstrument Panel Wire
05±1302
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
7 CHECK ENGINE ROOM MAIN WIRE(OPEN)
(a) Disconnect the engine room main wire connect from the
instrument panel wire.
(b) Using a service wire, connect SL+ and SL± of the connec-
tor ºEº.
NOTICE:
Do not forcibly insert a service wire into the terminal of the
connector when connecting.
(c) Measure the resistance between SL+ and SL± of the con-
nector ºDº.
OK:
Resistance: Below 1
NG REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
8 CHECK ENGINE ROOM MAIN WIRE(TO B+)
(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.
(c) Disconnect the engine room main wire connector from the
instrument panel wire.
(d) Connect the negative (±) terminal cable to the battery,
and turn the ignition switch to the ON position.
(e) Measure the voltage between the body ground and each
of SL+ and SL± of the connector ºDº.
OK:
Voltage: Below 1 V
NG REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
Page 1352 of 5135
H42512
Engine Room
Main Wire
SL± SL+Airbag
Sensor
Assy
Center
Airbag Sensor
Front LH
A
B C
D E FInstrument Panel Wire
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05±1303
AVENSIS REPAIR MANUAL (RM1018E)
9 CHECK ENGINE ROOM MAIN WIRE(TO GROUND)
(a) Disconnect the engine room main wire connector from the
instrument panel wire.
(b) Measure the resistance between the body ground and
each of SL+ and SL± of the connector ºDº.
OK:
Resistance: 1 Mor Higher
NG REPAIR OR REPLACE ENGINE ROOM MAIN
WIRE
OK
REPAIR OR REPLACE INSTRUMENT PANEL WIRE