Toyota RAV4 (XA40) 2013-2018 Service Manual: Lost communication with front satellite sensor bus lh

Description
The front airbag sensor lh consists of the diagnostic circuit and the frontal
deceleration sensor.
If the center airbag sensor receives signals from the frontal deceleration
sensor, it determines whether or
not the srs should be activated.
Dtc b1607/84, b1608/84, b1617/84 or b1618/84 is recorded when a malfunction is
detected in the front
airbag sensor lh circuit.

Wiring diagram

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

- Check front airbag sensor lh circuit (open)

- Disconnect the connectors from the center airbag sensor
and the front airbag sensor lh.
- Using a service wire, connect a15-2 (+sl) and a15-1 (-
sl) of connector e.
Notice:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- Measure the resistance of the wire harness side
connector.
Standard resistance


- Check front airbag sensor lh circuit (short)

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


- Check front airbag sensor lh 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
connectors.
Standard voltage


- Check front airbag sensor lh 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 resistance of the wire harness side
connector.
Standard resistance


- Check front airbag sensor lh

- Connect the connectors to the center airbag sensor.
- Interchange the front airbag sensor rh and lh, and
connect the connectors to them.
- 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).
Result 
Hint:
Dtcs other than b1602/83, b1603/83, b1612/83,
b1613/83, b1607/84, b1608/84, b1617/84 and b1618/
84 may be output at this time, but they are not related to
this check.

Use simulation method to check
- Check engine room main wire (open)

- Disconnect the service wire from connector e.
- Disconnect the engine room main wire connector from
the instrument panel wire.
- Using a service wire, connect ae5-1 (+sl) and ae5-2 (-
sl) of connector d.
Notice:
Do not forcibly insert a service wire into the
terminals of the connector when connecting.
- Measure the resistance of the wire harness side
connector.
Standard resistance


Repair or replace instrument panel wire
- Check engine room main wire (short)

- Disconnect the engine room main wire connector from
the instrument panel wire.
- Measure the resistance of the wire harness side
connector.
Standard resistance


Repair or replace instrument panel wire
- Check engine room main 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 engine room main wire connector from
the instrument panel 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 connector
Standard voltage


Repair or replace instrument panel wire
- Check engine room main wire (to ground)

- Disconnect the engine room main wire connector from
the instrument panel wire.
- Measure the resistance of the wire harness side
connector.
Standard resistance


Repair or replace instrument panel wire
Description
The front airbag sensor rh consists of the diagnostic circuit and the frontal
deceleration sensor.
If the center airbag sensor receives signals from the frontal deceleration
se ...
Description
The front airbag sensor rh consists of the diagnostic circuit, the frontal
deceleration sensor, etc.
If the center airbag sensor assembly receives signals from the frontal
dece ...
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Before driving
Floor mat
Use only floor mats designed specifically for vehicles of the same
model and model year as your vehicle. Fix them securely in place
onto the carpet.
Insert the retaining hooks (clips)
into the floor mat eyelets.
Turn the upper knob of each
retaining hook (clip) to secure
t ...