Toyota Sequoia (2005). Manual — part 356
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H10600
H01007
H43920
H23364
DLC3
CG
TC
DTC B1653/35
Seat
Position
Airbag
Sensor
Assembly
Airbag
Sensor
Assembly
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1219
1413
9
Check airbag sensor assembly.
PREPARATION:
Connect the negative (–) terminal cable to the battery, and wait
for at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(b)
Clear the DTCs stored in memory (see page
(c)
Turn the ignition switch to the LOCK position.
(d)
Turn the ignition switch to the ON position, and wait for at
least for 60 seconds.
(e)
OK:
DTC B1653/35 is not output.
HINT:
Codes other than DTC B1653/35 may be output at this time, but
they are not related to this check.
NG
Replace airbag sensor assembly
(see page
).
OK
END
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H23244
Airbag Sensor Assembly
A19
10
LBE+
G
4
B18 (*1)
Buckle SW LH
Seat Position Airbag Sensor Assembly
*1: The connectors of the seat position airbag sensor assembly and the
front seat inner belt LH (buckle switch LH) are in common use.
Buckle
SW
6
R
A19
18
LBE–
DI–1220
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1414
DTC
B1656/38 Seat Belt Buckle Switch (LH) Malfunction
CIRCUIT DESCRIPTION
The seat belt buckle switch LH circuit consists of the airbag sensor assembly and the front seat inner belt
LH.
DTC B1656/38 is recorded when a malfunction is detected in the seat belt buckle switch LH circuit.
DTC No.
DTC Detection Condition
Trouble Area
B1656/38
The airbag sensor assembly receives a line short circuit
signal, an open circuit signal, a short circuit to ground sig-
nal or a short circuit to B+ signal in the seat belt buckle
switch LH circuit for 2 seconds.
Front seat inner belt LH malfunction
Airbag sensor assembly malfunction
Front seat inner belt LH
Airbag sensor assembly
Floor wire No. 2
WIRING DIAGRAM
DIDH0–01
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C84216
H10600 C92968
H24657
CG
TC
DTC B1656/38
DLC3
Airbag
Sensor
Assembly
Front Seat
Inner Belt LH
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
DI–1221
1415
INSPECTION PROCEDURE
CAUTION:
Be sure to perform the following procedures before troubleshooting to avoid unexpected airbag de-
ployment.
(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)
Disconnect the connectors from the airbag sensor assembly.
(d)
Disconnect the connectors from the steering wheel pad.
(e)
Disconnect the connectors from the front passenger airbag assembly.
(f)
w/ Side and curtain shield airbag:
Disconnect the connectors from the side airbag assembly LH and RH.
(g)
w/ Side and curtain shield airbag:
Disconnect the connectors from the curtain shield airbag assembly LH and RH.
(h)
Disconnect the connectors from the front seat outer belt LH and RH.
1
Check DTC.
PREPARATION:
(a)
Connect the connectors to the airbag sensor assembly.
(b)
Connect the negative (–) terminal cable to the battery,
and wait for at least 2 seconds.
CHECK:
(a)
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(b)
Clear the DTCs stored in memory (see page
(c)
Turn the ignition switch to the LOCK position.
(d)
Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
(e)
OK:
DTC B1656/38 is not output.
HINT:
Codes other than DTC B1656/38 may be output at this time, but
they are not related to this check.
NG
Go to step 2.
OK
From the results of the above inspection, the malfunctioning part can now be considered normal.
To make sure of this, use the simulation method to check (see page
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H03353
G27651
H24026
H24551
Airbag
Sensor
Assembly
LBE+
LBE–
Front Seat
Inner Belt LH
B
C
D
A
Service Wire
Floor Wire No. 2
A19
B18
4
6
DI–1222
–
DIAGNOSTICS
SUPPLEMENTAL RESTRAINT SYSTEM
1416
2
Check connection of connectors.
PREPARATION:
(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.
CHECK:
Check that the connectors are properly connected to the airbag sensor assembly and the front seat inner
belt LH.
OK:
The connectors are connected securely.
NG
Connect connectors, then go to step 1.
OK
3
Check floor wire No. 2 (open).
PREPARATION:
(a)
Disconnect the connectors from the airbag sensor as-
sembly and the front seat inner belt LH.
(b)
Using a service wire, connect B18–4 and B18–6 of con-
nector ”C”.
NOTICE:
Do not forcibly insert a service wire into the terminals of the
connector when connecting.
CHECK:
Measure the resistance according to the value(s) in the table
below.
OK:
Tester Connection
Condition
Specified Condition
A19–10 (LBE+) –
A19–18 (LBE–)
Always
Below 1
Ω
NG
Repair or replace floor wire No. 2.
OK
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