Toyota Sienna Service Manual: Seat Belt Buckle Switch LH Circuit Malfunction
DTC B0126/27 Seat Belt Buckle Switch LH Circuit Malfunction
DESCRIPTION
The seat belt buckle switch LH circuit consists of the center airbag sensor
assembly and the front seat
inner belt assembly LH.
DTC B0126/27 is recorded when a malfunction is detected in the seat belt buckle
switch LH circuit
DTC No. |
DTC Detecting Condition |
Trouble Area |
B0126/27 |
- The center airbag sensor assembly receives a line
short circuit signal, an open circuit signal, a short
circuit to ground signal or a short circuit to B+ signal
in the seat belt buckle switch LH circuit for 2
seconds.
- Front seat inner belt assembly LH malfunction
- Center airbag sensor assembly malfunction
|
- Front seat inner belt assembly LH (Seat belt buckle
switch LH)
- Center airbag sensor assembly
- Floor wire
|
WIRING DIAGRAM

INSPECTION PROCEDURE
1 CHECK DTC

- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0126/27 is not output.
HINT:
Codes other than code B0126/27 may be output at this
time, but they are not related to this check.
Go to step 2

USE SIMULATION METHOD TO CHECK
2 CHECK CONNECTION OF CONNECTORS
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Check that the connectors are properly connected to the
center airbag sensor assembly and the front seat inner
belt assembly LH.
OK:
The connectors are connected.
CONNECT CONNECTORS

3 CHECK VEHICLE
- Check the front driver seat type.
Result

Go to step 11
4 CHECK FLOOR WIRE (OPEN)

- Disconnect the connectors from the center airbag sensor
assembly and the front seat inner belt assembly LH.
- w/ Side airbag:
Using a service wire, connect A20-19 (LBE+) and A20-2
(LBE-) of connector "B".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- w/o Side airbag:
Using a service wire, connect A20-11 (LBE+) and A20-6
(LBE-) of connector "B".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE FLOOR WIRE

5 CHECK FLOOR WIRE (SHORT TO B+)

- Disconnect the service wire from connector "B".
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage

REPAIR OR REPLACE FLOOR WIRE

6 CHECK FLOOR WIRE (SHORT TO GROUND)

- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE FLOOR WIRE

7 CHECK FLOOR WIRE (SHORT)

- Measure the voltage according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE FLOOR WIRE

8 CHECK FRONT SEAT INNER BELT ASSEMBLY LH

- Connect the connectors to the front seat inner belt
assembly LH and the center airbag sensor assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0126/27 is not output.
HINT:
Codes other than code B0126/27 may be output at this
time, but they are not related to this check.
Go to step 9

USE SIMULATION METHOD TO CHECK
9 REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Replace the front seat inner belt assembly LH.
HINT:
Perform the inspection using parts from a normal vehicle
if possible.

10 CHECK CENTER AIRBAG SENSOR ASSEMBLY

- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0126/27 is output.
HINT:
Codes other than code B0126/27 may be output at this
time, but they are not related to this check.
REPLACE CENTER AIRBAG SENSOR
ASSEMBLY

END
11 CHECK FLOOR WIRE (OPEN)

- Disconnect the connectors from the center airbag sensor
assembly and the front seat inner belt assembly LH.
- w/ Side airbag:
Using a service wire, connect A20-19 (LBE+) and A20-2
(LBE-) of connector "B".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- w/o Side airbag:
Using a service wire, connect A20-11 (LBE+) and A20-6
(LBE-) of connector "B".
NOTICE:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE FLOOR WIRE

12 CHECK FLOOR WIRE (SHORT TO B+)

- Disconnect the service wire from connector "B".
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position.
- Measure the voltage according to the value(s) in the
table below.
Standard voltage

REPAIR OR REPLACE FLOOR WIRE

13 CHECK FLOOR WIRE (SHORT TO GROUND)

- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE FLOOR WIRE

14 CHECK FLOOR WIRE (SHORT)

- Measure the resistance according to the value(s) in the
table below.
Standard resistance

REPAIR OR REPLACE FLOOR WIRE

15 CHECK FRONT SEAT INNER BELT ASSEMBLY LH

- Connect the connectors to the front seat inner belt
assembly LH and the center airbag sensor assembly.
- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0126/27 is not output.
HINT:
Codes other than code B0126/27 may be output at this
time, but they are not related to this check.
Go to step 16

USE SIMULATION METHOD TO CHECK
16 REPLACE FRONT SEAT INNER BELT ASSEMBLY LH
- Turn the ignition switch to the LOCK position.
- Disconnect the negative (-) terminal cable from the
battery, and wait for at least 90 seconds.
- Replace the front seat inner belt assembly LH.
HINT:
Perform the inspection using parts from a normal vehicle
if possible.

17 CHECK CENTER AIRBAG SENSOR ASSEMBLY

- Connect the negative (-) terminal cable to the battery,
and wait for at least 2 seconds.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Clear the DTCs stored in memory (5).
- Turn the ignition switch to the LOCK position.
- Turn the ignition switch to the ON position, and wait for at
least 60 seconds.
- Check the DTCs (5).
OK:
DTC B0126/27 is not output.
HINT:
Codes other than code B0126/27 may be output at this
time, but they are not related to this check.
REPLACE CENTER AIRBAG SENSOR
ASSEMBLY

END
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