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 ...
Other materials:
PCS (Pre-Collision System)
The pre-collision system
uses a radar sensor and
front camera to detect
objects in front of
the vehicle. When the system
determines that the
possibility of a frontal collision
with an object is high,
a warning operates to urge
the driver to take evasive
action and the potential
brake pressure is inc ...
Emergency flashers
The emergency flashers are
used to warn other drivers
when the vehicle has to be
stopped in the road due to a
breakdown, etc.
Operating instructions
Press the switch.
All the turn signal lights will flash.
To turn them off, press the switch
once again.
â– Emergency flashers
If the emergency fla ...
Only rear door lh lock / unlock functions do not operate
Description
The main body ecu receives lock / unlock switch signals and activates the
door lock motor accordingly.
Wiring diagram
Inspection procedure
Inspect rear door with motor lock assembly lh
Apply the battery voltage to the door lock motor and
check the operation of th ...