Passenger airbag on / off indicator circuit malfunction

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.

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

1. 1
   Check passenger airbag on/off indicator operation
2. 2
   Turn the ignition switch on.
3. 3
   Check the passenger airbag on / off indicator operation.

   

Result

1. 1
   Check connection of connector
2. 2
   Turn the ignition switch off.
3. 3
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
4. 4
   Check that the connectors are properly connected to the center airbag sensor and the front passenger seat belt warning light.

3. Check front passenger airbag on/off indicator light

1. 1
   Turn the ignition switch off.
2. 2
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. 3
   Disconnect the connector from the center airbag sensor.
4. 4
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
5. 5
   Turn the ignition switch on.
6. 6
   Check the passenger airbag on / off indicator operation.

4. Check instrument panel wire (for open)

1. 1
   Turn the ignition switch off.
2. 2
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. 3
   Disconnect the connector from the front passenger airbag on / off indicator light.
4. 4
   Using a service wire, connect e45-23 (paon) and e45- 17 (p-ab) of connector b.

Do not forcibly insert the service wire into the terminals of the connector when connecting.

5. Measure the resistance of the wire harness side connectors.

Standard resistance

*1: For automatic air conditioning system

*2: For manual air conditioning system

5. Check instrument panel wire (for short)

1. 1
   Disconnect the service wire from connector b.
2. 2
   Measure the resistance of the wire harness side connectors.

Standard resistance

6. Check instrument panel wire (to b+)

1. 1
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
2. 2
   Turn the ignition switch on.
3. 3
   Measure the voltage of the wire harness side connectors.

Standard voltage

1. Check instrument panel wire (to ground)

1. 1
   Turn the ignition switch off.
2. 2
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. 3
   Measure the resistance of the wire harness side connectors.

Standard resistance

1. 1
   Check connection of connector
2. 2
   Turn the ignition switch off.
3. 3
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
4. 4
   Check that the connectors are properly connected to the center airbag sensor and the heater control panel*1 or clock*2.

9. Check instrument panel wire (for open)

1. 1
   Disconnect the connector from the front passenger airbag on / off indicator light
2. 2
   Using a service wire, connect e45-23 (paon) and e45- 17 (p-ab) of connector b.

Do not forcibly insert the service wire into the terminals of the connector when connecting.

3. Measure the resistance of the wire harness side connectors.

Standard resistance

*1: For automatic air conditioning system

*2: For manual air conditioning system

10. Check instrument panel wire (for short)

1. 1
   Disconnect the service wire from connector b.
2. 2
   Measure the resistance of the wire harness side connector.

Standard resistance

11. Check instrument panel wire (to b+)

1. 1
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
2. 2
   Turn the ignition switch on.
3. 3
   Measure the voltage of the wire harness side connector.

Standard voltage

1. 1
   Check instrument panel wire (to ground)
2. 2
   Turn the ignition switch off.
3. 3
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
4. 4
   Measure the resistance of the wire harness side connector.

Standard resistance

13. Check wire harness (power source)

1. 1
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
2. 2
   Turn the ignition switch on.
3. 3
   Measure the voltage of the wire harness side connector

Standard voltage

*1: For automatic air conditioning system

*2: For manual air conditioning system

1. Check front passenger airbag on/off indicator light

1. 1
   Turn the ignition switch off.
2. 2
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. 3
   Disconnect the connector from the heater control panel*1 or clock sub-assembly*2.
4. 4
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
5. 5
   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.

*1: For automatic air conditioning system

*2: For manual air conditioning system

6. 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.

*1: For automatic air conditioning system

*2: For manual air conditioning system

1. 1
   Turn the ignition switch on
2. 2
   Check the passenger airbag on / off indicator operation.

15. Check center airbag sensor assembly

1. 1
   Turn the ignition switch off.
2. 2
   Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

*1: For automatic air conditioning system

*2: For manual air conditioning system

1. 1
   Connect the connector to the center airbag sensor.
2. 2
   Connect the connector to the heater control panel*1 or clock*2.
3. 3
   Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
4. 4
   Turn the ignition switch on, and wait for at least 60 seconds.
5. 5
   Clear the dtcs (see page rs-49).
6. 6
   Turn the ignition switch off.
7. 7
   Turn the ignition switch on, and wait for at least 60 seconds.
8. 8
   Check for dtcs (see page rs-49).

Dtcs other than b1660/43 may be output at this time, but they are not related to this check.