AIRBAG SYSTEM Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

This circuit detects the airbag cut off switch status.

The passenger airbag ON/OFF indicator comes on to inform the front passenger 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 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

A003U12E13

INSPECTION PROCEDURE

Tech Tips

Terminals E14-11 (MSW+) and E14-12 (MSW-) of the center 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
    OK
  2. CHECK CONNECTORS


    1. Turn the power switch off.

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

      CAUTION:

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

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

      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 center airbag sensor assembly and airbag cut off switch.

    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
    OK
  3. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A003USME10
      Text in Illustration
      *1 Airbag Cut Off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector B
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      *b

      Front view of wire harness connector

      (to Airbag Cut Off Switch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E19-2 (PMC+) - E19-1 (PMC-) Always Below 1 Ω

    NG
    OK
  4. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A003TNJE09
      Text in Illustration
      *1 Airbag Cut Off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch)

      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
      E19-2 (PMC+) - E19-1 (PMC-) Always 1 MΩ or higher

    NG
    OK
  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A003TNJE09
      Text in Illustration
      *1 Airbag Cut Off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch)

      Connect the cable to the negative (-) 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
      E19-2 (PMC+) - Body ground Power switch on (IG) Below 1 V
      E19-1 (PMC-) - Body ground Power switch on (IG) Below 1 V

    NG
    OK
  6. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A003TNJE09
      Text in Illustration
      *1 Airbag Cut Off Switch
      *2 Center Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Airbag Cut Off Switch)

      Turn the power switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) 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
      E19-2 (PMC+) - Body ground Always 1 MΩ or higher
      E19-1 (PMC-) - Body ground Always 1 MΩ or higher

    NG
    OK
  7. CHECK AIRBAG CUT OFF SWITCH


    1. A003T51E11
      Text in Illustration
      *a

      Component without harness connected

      (Airbag Cut Off Switch)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      E19-2 (PMC+) - E19-1 (PMC-) Cut off switch is ON 360 to 440 Ω
      E19-2 (PMC+) - E19-1 (PMC-) Cut off switch is OFF 90 to 110 Ω

    NG
    OK