2005 TOYOTA AVENSIS diagnostic

H42513
B9
Buckle SW (Driver's Seat)
Buckle SW
3
1G±Y
W±BAirbag Sensor Assy Center
LBE+
LBE± 19
2 A26
A26 05±1254
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B0126/27 SEAT BELT BUCKLE SWITCH (LH)
MALFUNCTION
DTC B0127/27 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 (seat belt buckle switch LH).
DTC B0126/27 or B0127/27 is recorded when a malfunction is detected in the seat belt buckle switch LH
circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0126/B0127/
27

Short circuit in seat belt buckle switch LH wire harness (to
ground)

Short circuit in seat belt buckle switch LH wire harness (to
B+)

Front seat inner belt assy LH malfunction

Airbag sensor assy center malfunction

Front seat inner belt assy LH (Seat belt buckle switch LH)

Airbag sensor assy center

Floor wire
HINT:
DTC B0126/27 or B0127/27 is indicated only for the LHD vehicle.
WIRING DIAGRAM
056M6±03

H41707
Airbag
Sensor
Assy
Center Front Seat Inner
Belt Assy LH
LBE+
Floor Wire
A
B C D
H41707
Airbag
Sensor
Assy
Center Front Seat Inner
Belt Assy LH
LBE+
Floor Wire
A
B C D
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05±1255
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 CHECK FLOOR 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 connectors from the airbag sensor assy
center and the front seat inner belt assy LH.
(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 LBE+
of the connector ºBº.
OK:
Voltage: Below 1 V
NG REPAIR OR REPLACE FLOOR WIRE
OK
2 CHECK FLOOR WIRE(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
LBE+ of the connector ºBº.
OK:
Resistance: 1 M
or Higher
NG REPAIR OR REPLACE FLOOR WIRE
OK

H41708
Airbag
Sensor
Assy
Center Front Seat Inner
Belt Assy LH
LBE+
Floor Wire
LBE±
A
B
H41708
Airbag
Sensor
Assy
Center Front Seat Inner
Belt Assy LH
LBE+
Floor Wire
LBE±
A
B
05±1256
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK FRONT SEAT INNER BELT ASSY LH
(a) Connect the connector to the front seat inner belt assy
LH.
(b) Unlock the seat belt at the front seat LH.
(c) Measure the resistance between LBE+ and LBE± of the
connector ºBº.
OK:
Resistance: 1.0 k
to 1.6 k

NG REPLACE FRONT SEAT INNER BELT ASSY LH
OK
4 CHECK FRONT SEAT INNER BELT ASSY LH
(a) Lock the seat belt at the front seat LH.
(b) Measure the resistance between LBE+ and LBE± of the
connector ºBº.
OK:
Resistance: 100
to 500

NG REPLACE FRONT SEAT INNER BELT ASSY LH
OK

\b 



\bH41027
Front Seat Inner
Belt Assy LHAirbag
Sensor
Assy
Center
DTC B0126/B0127/27
DLC3
TC
CG
±
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
05±1257
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK AIR BAG SENSOR ASSY CENTER
(a)Connect the connector to the airbag sensor assy center.
(b)Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
(c)Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(d)Clear the stored DTCs in the memory (See page 05±1184).
(e)Turn the ignition switch to the LOCK position.
(f)Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(g)Check the DTCs (See page 05±1184).
OK:
DTC B0126/27 or B0127/27 is not output.
HINT:
Codes other than code B0126/27 or B0127/27 may be output
at this time, but they are not relevant to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER
OK
USE SIMULATION METHOD TO CHECK

H42513
RBE+
RBE± G±Y
W±B 3
1 B9
Buckle SW (Driver's Seat)
Buckle SWAirbag Sensor Assy Center
14
A28
3
A28 05±1250
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
DTC B0121/26 SEAT BELT BUCKLE SWITCH (RH)
MALFUNCTION
DTC B0122/26 SEAT BELT BUCKLE SWITCH (RH)
MALFUNCTION
CIRCUIT DESCRIPTION
The seat belt buckle switch RH circuit consists of the airbag sensor assy center and the front seat inner belt
assy RH (seat belt buckle switch RH).
DTC B0121/26 or B0122/26 is recorded when a malfunction is detected in the seat belt buckle switch RH
circuit.
DTC No.DTC Detecting ConditionTrouble Area
B0121/B0122/
26

Short circuit in seat belt buckle switch RH wire harness (to
ground)

Short circuit in seat belt buckle switch RH wire harness (to
B+)

Seat belt buckle switch RH malfunction

Airbag sensor assy center

Front seat inner belt assy RH (Seat belt buckle switch RH)

Airbag sensor assy center

Floor wire No.2
HINT:
DTC B0121/26 or B0122/26 is indicated only for the RHD vehicle.
WIRING DIAGRAM
056M5±03



H42229
Airbag
Sensor
Assy
Center
Front Seat Inner
Belt Assy RHFloor Wire No.2
RBE+
A
B
C D


H42229
Airbag
Sensor
Assy
Center
Front Seat Inner
Belt Assy RHFloor Wire No.2
RBE+
A
B
C D
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
05±1251
AVENSIS REPAIR MANUAL (RM1018E)
INSPECTION PROCEDURE
1 CHECK FLOOR WIRE NO.2(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 connectors from the airbag sensor assy
center and the front seat inner belt assy RH.
(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 RBE+
of the connector ºBº.
OK:
Voltage: Below 1 V
NG REPAIR OR REPLACE FLOOR WIRE NO.2
OK
2 CHECK 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
RBE+ of the connector ºBº.
OK:
Resistance: 1 M
or Higher
NG REPAIR OR REPLACE FLOOR WIRE NO.2
OK

H42509
Airbag
Sensor
Assy
Center Front Seat Inner
Belt Assy RHFloor Wire No.2
RBE±
RBE+
A
B
H42509
Airbag
Sensor
Assy
Center Front Seat Inner
Belt Assy RHFloor Wire No.2
RBE±
RBE+
A
B
05±1252
± DIAGNOSTICSSUPPLEMENTAL RESTRAINT SYSTEM
AVENSIS REPAIR MANUAL (RM1018E)
3 CHECK FRONT SEAT INNER BELT ASSY RH
(a) Connect the connector to the front seat inner belt assy
RH.
(b) Unlock the seat belt at the front seat RH.
(c) Measure the resistance between RBE+ and RBE± of the
connector ºBº.
OK:
Resistance: 1.0 k
to 1.6 k

NG REPLACE FRONT SEAT INNER BELT ASSY RH
OK
4 CHECK FRONT SEAT INNER BELT ASSY RH
(a) Lock the seat belt at the front seat RH.
(b) Measure the resistance between the RBE+ and RBE± of
the connector ºBº.
OK:
Resistance: 100
to 500

NG REPLACE FRONT SEAT INNER BELT ASSY RH
OK






H42333
Airbag
Sensor
Assy
Center
Front Seat Inner
Belt Assy RH
DLC3
CG TC DTC B0121/B0122/26
±
DIAGNOSTICS SUPPLEMENTAL RESTRAINT SYSTEM
05±1253
AVENSIS REPAIR MANUAL (RM1018E)
5CHECK AIR BAG SENSOR ASSY CENTER
(a)Connect the connector to the airbag sensor assy center.
(b)Connect the negative (±) terminal cable to the battery,
and wait for at least 2 seconds.
(c)Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(d)Clear the stored DTCs in the memory (See page 05±1184).
(e) Turn the ignition switch to the LOCK position.
(f) Turn the ignition switch to the ON position, and wait for at least 10 seconds.
(g)Check the DTCs (See page 05±1184).
OK:
DTC B0121/26 or B0122/26 is not output.
HINT:
Codes other than code B0121/26 or B0122/26 may be output
at this time, but they are not relevant to this check.
NG REPLACE AIR BAG SENSOR ASSY CENTER
OK
USE SIMULATION METHOD TO CHECK