AIRBAG SYSTEM Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

This circuit detects the airbag cut off switch cylinder sub-assembly status.

The passenger airbag ON/OFF indicator comes on to inform the front passenger airbag and front passenger side knee airbag status (activated or deactivated).

Tech Tips

Approximately 6 seconds after the power switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the conditions listed below.

Airbag Cut Off Switch Cylinder Sub-assembly Passenger Airbag ON/OFF Indicator SRS Warning Light
ON Indicator OFF Indicator
ON position ON OFF OFF
OFF position OFF ON OFF
Switch failure OFF ON ON

WIRING DIAGRAM

A003WKSE15

INSPECTION PROCEDURE

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

Tech Tips

Terminals H84-11 (MSW+) and H84-12 (MSW-) of the airbag sensor assembly in this circuit have an activation prevention mechanism.

This mechanism can be used to check for an open circuit in the wire harness. In case of other checks (check for short, short to ground or short to B+), this mechanism should be released.

PROCEDURE


  1. CHECK SRS WARNING LIGHT


    1. Turn the power switch on (IG), and check the SRS warning light condition.

      Tech Tips

      If this trouble occurs, the SRS warning light is off. If it is on, a DTC is stored. Troubleshoot for the stored DTC.

      OK
      After the primary check period, the SRS warning light goes off.

      Tech Tips

      The primary check period is approximately 6 seconds after the power switch is turned on (IG).


    NG

    GO TO DTC CHART Click here

    OK

  2. CHECK CONNECTORS


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connectors from the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    6. Check that the short spring for the instrument panel wire connector with the activation prevention mechanism is not deformed or damaged.

      OK
      The short spring is not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A003ZHGE12
      Text in Illustration
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H134-2 (PMC+) - H134-1 (PMC-) Always Below 1 Ω

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A003ZHGE12
      Text in Illustration
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Release the activation prevention mechanism built into connector B Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H134-2 (PMC+) - H134-1 (PMC-) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A003ZHGE12
      Text in Illustration
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Connect the cable to the negative (-) auxiliary battery terminal.

    2. Turn the power switch on (IG).

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H134-2 (PMC+) - Body ground Power switch on (IG) Below 1 V
      H134-1 (PMC-) - Body ground Power switch on (IG) Below 1 V

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A003ZHGE12
      Text in Illustration
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      H134-2 (PMC+) - Body ground Always 1 MΩ or higher
      H134-1 (PMC-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  7. CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY


    1. A003VAEE02
      Text in Illustration
      *a

      Component without harness connected

      (Airbag Cut Off Switch Cylinder Sub-assembly)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H134-2 (PMC+) - H134-1 (PMC-) Cut off switch is ON 360 to 440 Ω
      H134-2 (PMC+) - H134-1 (PMC-) Cut off switch is OFF 90 to 110 Ω

    NG

    REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY Click here

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here