Toyota RAV4 (XA40) 2013-2018 Service Manual: Passenger airbag on / off indicator circuit malfunction

Description
The passenger airbag on / off indicator circuit consists of the center airbag
sensor and the heater
control panel*1 or *2.
This circuit indicates the operation condition of the front passenger airbag,
the front passenger side airbag
and passenger side seat belt pretensioner.
Dtc b1660/43 is set when a malfunction is detected in the passenger airbag on /
off indicator circuit.

Hint:
- *1: For automatic air conditioning system
- *2: For manual air conditioning system
Wiring diagram

Inspection procedure
- Check passenger airbag on/off indicator operation
- Turn the ignition switch on.
- Check the passenger airbag on / off indicator
operation.

Result

- 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 front passenger seat belt
warning light.
Ok:
the connectors are properly connected.

- Check front passenger airbag on/off indicator light

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Disconnect the connector from the center airbag sensor.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Turn the ignition switch on.
- Check the passenger airbag on / off indicator
operation.
Ok:
neither on nor off passenger airbag on / off
indicator comes on.

- Check instrument panel wire (for open)

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Disconnect the connector from the front passenger
airbag on / off indicator light.
- Using a service wire, connect e45-23 (paon) and e45-
17 (p-ab) of connector b.
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

Hint:
*1: For automatic air conditioning system
*2: For manual air conditioning system

- Check instrument panel wire (for short)

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

- Check instrument panel wire (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 instrument panel wire (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
connectors.
Standard resistance


Replace front passenger airbag on/off indicator light
- 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 heater control panel*1 or
clock*2.
Ok:
the connectors are properly connected.

- Check instrument panel wire (for open)

- Disconnect the connector from the front passenger
airbag on / off indicator light
- Using a service wire, connect e45-23 (paon) and e45-
17 (p-ab) of connector b.
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

Hint:
*1: For automatic air conditioning system
*2: For manual air conditioning system

- Check instrument panel wire (for short)

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


- Check instrument panel wire (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 instrument panel wire (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 wire harness (power source)

- 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
Hint:
*1: For automatic air conditioning system
*2: For manual air conditioning system


- Check front passenger airbag on/off indicator
light

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
- Disconnect the connector from the heater control
panel*1 or clock sub-assembly*2.
- Connect the cable to the negative (-) battery terminal,
and wait for at least 2 seconds.
- Using a service wire, connect e23-6*1 e22-4*2 (paon)
and e23-7*1 e22-5*2 (gnd) of the heater control panel
*1 or clock*2.
Hint:
*1: For automatic air conditioning system
*2: For manual air conditioning system
- Using a service wire, connect e23-13*1 e22-9*2 (p-ab)
and e23-7 *1 e22-5*2 (gnd) of the heater control panel
*1 or clock*2.
Hint:
*1: For automatic air conditioning system
*2: For manual air conditioning system
- Turn the ignition switch on
- Check the passenger airbag on / off indicator
operation.
Ok:
front passenger airbag on / off indicator comes
on


- Check center airbag sensor assembly

- Turn the ignition switch off.
- Disconnect the cable from the negative (-) battery
terminal, and wait for at least 90 seconds.
Hint:
*1: For automatic air conditioning system
*2: For manual air conditioning system
- Connect the connector to the center airbag sensor.
- Connect the connector to the heater control panel*1 or
clock*2.
- 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 for dtcs (see page rs-49).
Ok:
dtc b1660/43 is not output.
Hint:
Dtcs other than b1660/43 may be output at this time,
but they are not related to this check.


Use simulation method to check
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