Toyota RAV4 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
Lost communication with front satellite sensor bus rh
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 ...
Front airbag sensor rh circuit malfunction
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:
Brake pedal load sensing switch
On-vehicle inspection
Inspect brake pedal load sensing switch
Hint:
Do not remove the brake pedal load sensing switch
from the brake pedal support.
When there is a malfunction in the brake pedal load
sensing switch, replace the brake pedal support.
Disconnect the brake pedal l ...
Check for short circuit
If the wire harness is ground shorted (fig. 5), Locate
the section by conducting a resistance check with
the body ground (below).
Check the resistance with the body ground.
Disconnect connectors a and c, and measure
the resistance
Standard resistance (fig. 6)
Hint:
Measure ...
Ig2 relay
On-vehicle inspection
Disconnect cable from negative battery
terminal
Caution:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
Remove ig2 relay
Remove the no. 1 Engine room re ...