Airbag System Trouble In Passenger Airbag On / Off Indicator

Restraints. Lexus Is250, Is220D. Gse20 Ale20
Supplemental Restraint System. Lexus Is250, Is220D. Gse20 Ale20

DESCRIPTION

INSPECTION PROCEDURE

CHECK SRS WARNING LIGHT

CHECK CONNECTION OF CONNECTORS

CHECK INSTRUMENT PANEL WIRE (OPEN)

CHECK INSTRUMENT PANEL WIRE (SHORT)

CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)

CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)

CHECK AIRBAG CUT OFF SWITCH CYLINDER

AIRBAG SYSTEM - Trouble in Passenger Airbag ON / OFF Indicator


DESCRIPTION

This circuit detects the manual cut off switch status.
The passenger airbag ON/OFF indicator comes on to inform the passengers of the front passenger airbag assembly, front passenger side knee airbag assembly and the front seat side airbag assembly (passenger side) status (activated or deactivated).

HINT:
Approximately 6 seconds after the engine switch is turned to the on (IG), the passenger airbag ON/OFF indicator will be ON/OFF depending on the conditions listed below.

Manual 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

INSPECTION PROCEDURE

1.CHECK SRS WARNING LIGHT

  1. Turn the engine 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 output. Troubleshoot for the output DTC.
    OK:
    After the primary check period, SRS warning light goes off.
    HINT:
    The primary check period is approximately 6 seconds after the ignition switch is turned on (IG).


NG
CHECK DTC
OK


2.CHECK CONNECTION OF CONNECTORS

  1. Turn the engine switch off.

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

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

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS, THEN GO TO STEP 1
OK


3.CHECK INSTRUMENT PANEL WIRE (OPEN)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System.Airbag System Trouble In Passenger Airbag On / Off Indicator

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

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    J91-2 (PMC+) -
    J91-1 (PMC-)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


4.CHECK INSTRUMENT PANEL WIRE (SHORT)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System.Airbag System Trouble In Passenger Airbag On / Off Indicator

  1. Release the activation prevention mechanism built into connector "B".

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    J91-2 (PMC+) -
    J91-1 (PMC-)
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


5.CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System.Airbag System Trouble In Passenger Airbag On / Off Indicator

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

    Standard resistance:
    Tester connection
    		Condition
    		Specified condition
    J91-2 (PMC+) -
    Body ground
    		Always
    		1 MΩ or higher
    J91-1 (PMC-) -
    Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


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


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System.Airbag System Trouble In Passenger Airbag On / Off Indicator

  1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

  1. Turn the engine switch on (IG).

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

    Standard voltage:
    Tester connection
    		Condition
    		Specified condition
    J91-2 (PMC+) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V
    J91-1 (PMC-) -
    Body ground
    		Engine switch on (IG)
    		Below 1 V


NG
REPAIR OR REPLACE INSTRUMENT PANEL WIRE
OK


7.CHECK AIRBAG CUT OFF SWITCH CYLINDER


    Lexus Is250, Is220D. Gse20 Ale20.Supplemental Restraint System.Airbag System.Airbag System Trouble In Passenger Airbag On / Off Indicator

  1. Turn the engine switch off.

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

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

    Standard resistance:
    Tester connection
    		Manual cut off switch condition
    		Specified condition
    J91-2 (PMC+) -
    J91-1 (PMC-)
    		Cut off switch is in ON position
    		360 to 440 Ω
    J91-2 (PMC+) -
    J91-1 (PMC-)
    		Cut off switch is in OFF position
    		90 to 110 Ω


NG
REPLACE AIRBAG CUT OFF SWITCH CYLINDER
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY