AIRBAG SYSTEM > Trouble in Passenger Airbag ON/OFF Indicator

for Preparation Click here


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).

HINT:
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


C145458E15


INSPECTION PROCEDURE

NOTICE:
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).

HINT:
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.

1.CHECK SRS WARNING LIGHT

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

    HINT:
    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.

    HINT:
    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.

  1. 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.

  1. 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.

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

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

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

    OK:
    The terminals are not deformed or damaged.

  1. 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)


    C145464E12

  1. 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

    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)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


4.CHECK INSTRUMENT PANEL WIRE (SHORT)


    C145464E12

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

  1. 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

    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)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


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


    C145464E12

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

  1. Turn the power switch on (IG).

  1. 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

    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)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


6.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    C145464E12

  1. Turn the power switch off.

  1. 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.

  1. 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

    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)



NG
REPLACE INSTRUMENT PANEL WIRE
OK


7.CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY


    C234623E02

  1. 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

    Text in Illustration 
    *a
    		Component without harness connected
    (Airbag Cut Off Switch Cylinder Sub-assembly)



NG
REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY (Click here)
OK

REPLACE AIRBAG SENSOR ASSEMBLY (Click here)