Toyota RAV4 (XA40) 2013-2018 Service Manual: Seat position airbag sensor circuit malfunction

Description
The seat position sensor circuit consists of the center airbag sensor and the
seat position sensor.
Dtc b1653/35 is recorded when a malfunction is detected in the seat position
sensor circuit.

Wiring diagram

Inspection procedure
- Check for dtc

- Turn the ignition switch on, and wait for at least 60
seconds.
- Clear the dtcs (see page rs-49).
- Turn the ignition switch off.
- Turn the ignition switch on, and wait for at least 60
seconds.
- Check the dtcs (see page rs-49).
Ok:
dtc b1653/35 is not output.
Hint:
Dtcs other than dtc b1653/35 may be output at this
time, but they are not related to this check.

- Check connection of connector
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Check that the connectors are properly connected to the
center airbag sensor and the seat position sensor.
Ok:
the connectors are properly connected.

- Check seat position sensor circuit (open)

- Disconnect the connectors from the center airbag sensor
and the seat position sensor.
- Using a service wire, connect 2 and 1 of connector e.
Notice:
Do not forcibly insert the service wire into the
terminals of the connector when connecting.
- Measure the resistance of the wire harness side
connector.
Standard resistance:
W/o curtain shield airbag 
W/ curtain shield airbag 

- Check seat position sensor circuit (short)

- Disconnect the service wire from connector e.
- Measure the resistance of the wire harness side
connector.
Standard resistance 

- Check seat position sensor circuit (to b+)

- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Measure the voltage of the wire harness side connector.
Standard voltage 

- Check seat position sensor circuit (to ground)

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Measure the voltage of the wire harness side connector.
Standard resistance 

- Check seat position sensor

- Connect the connectors to the center airbag sensor and
the seat position sensor.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on, and wait for at least 60
seconds.
- Clear the dtcs (see page rs-49).
- Turn the ignition switch off.
- Turn the ignition switch on, and wait for at least 60
seconds.
- Check the dtcs (see page rs-49).
Ok:
dtc b1653/35 is not output.
Hint:
Dtcs other than dtc b1653/35 may be output at this
time, but they are not related to this check.


- Replace seat position sensor
- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Replace the seat position sensor (see page rs-389).
Hint:
Perform the inspection using parts from a normal vehicle
if possible.
- Check center airbag sensor assembly

- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on, and wait for at least 60
seconds.
- Clear the dtcs (see page rs-49).
- Turn the ignition switch off
- Turn the ignition switch on, and wait for at least 60
seconds.
- Check the dtcs (see page rs-49).
Ok:
dtc b1653/35 is not output.
Hint:
Dtcs other than dtc b1653/35 may be output at this
time, but they are not related to this check.

End
- Check floor wire (open)

- Disconnect the front seat inner belt connector from the
flow wire.
- Using a service wire, connect k4-1 (lsp+) and k4-2
(lsp-) of connector c.
Notice:
Do not forcibly insert the service wire into the
terminals of the connector when connecting.
- Measure the resistance of the wire harness side
connectors.
Standard resistance:
W/o curtain shield airbag 
W/ curtain shield airbag 

Replace front seat inner belt assembly lh
- Check floor wire (short)

- Disconnect the front seat inner belt connector from the
floor wire.
- Measure the resistance of the wire harness side
connector.
Standard resistance 

Replace front seat inner belt assembly lh
- Check floor wire (to b+)

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Disconnect the front seat inner belt connector from the
floor wire.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Measure the voltage of the wire harness side
connectors.
Standard voltage 

Replace front seat inner belt assembly lh
- Check floor wire (to ground)

- Disconnect the front seat inner belt connector from the
floor wire.
- Measure the resistance of the wire harness side
connectors.
Standard resistance

Replace front seat inner belt assembly lh
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Press the switch.
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ac ...