Toyota RAV4 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
Description
The occupant classification system circuit consists of the center airbag
sensor and the occupant
classification system.
When the center airbag sensor receives signals from the occup ...
Description
The driver side seat belt buckle switch circuit consists of the center airbag
sensor and the front seat inner
belt lh.
Dtc b1655/37 is recorded when a malfunction is detected in ...
Other materials:
On-vehicle inspection
Connect intelligent tester
Connect the intelligent tester to the dlc3.
Start the engine and idle it.
Select the active test mode on the intelligent tester.
Hint:
Please refer to the intelligent tester operator's
manual for further details.
Check actuator motor operation
...
Active Cruise Control with Stop & Go function ACC- Changing between cruise control
with/without distance control
Safety information
Warning
The system does not react to traffic driving
ahead of you, but instead maintains the stored
speed. There may be a risk of accident or risk
of damage to property. Adjust the desired
speed to the traffic conditions and brake as
needed.
Switch mode of the cruise control
Swit ...
Engine coolant temperature circuit
Description
A thermistor, whose resistance value varies according to the ect, is built
into the engine coolant
temperature (ect) sensor.
The structure of the sensor and its connection to the ecm are the same as those
of the intake air
temperature (iat) sensor.
Hint:
When any of dtcs ...