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
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control/electronic
key battery
Replace the battery with a new one if it is depleted.
You will need the following items:
Flathead screwdriver
Small flathead screwdriver
Lithium battery cr2016 (vehicles without a smart key system), or
cr2032 (vehicles with a smart key system)
Replacing the battery
Vehicles without a ...
Cooling system
On-vehicle inspection
Check cooling system for leaks
Remove the radiator reservoir cap.
Caution:
To avoid the danger of being burned, do not
remove the radiator reservoir cap while the
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steam to b ...
Motor rotation angle sensor malfunction
Description
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this information to the power
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Wiring diagram
Inspection procedure
Check connector connection condition
Check the installation condition of the motor rotation
angle senso ...