Airbag System Srs Warning Light Remains On

Vehicle Interior. Land Cruiser. Urj200, 202 Grj200 Vdj200
Supplemental Restraint Systems. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK CAN COMMUNICATION SYSTEM

CHECK BATTERY

CHECK CONNECTORS

CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF CENTER AIRBAG SENSOR)

CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER)

CHECK SRS WARNING LIGHT (SHORT TO GROUND)

AIRBAG SYSTEM - SRS Warning Light Remains ON


DESCRIPTION

The SRS warning light is located on the combination meter.
When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the ignition switch is turned from off to ON, and then goes off automatically.
If there is a malfunction in the SRS, the SRS warning light comes on to inform the driver of a problem.
When terminals TC and CG of the DLC3 are connected, DTCs are output by the blinking of the SRS warning light.
The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the center airbag sensor in case the source voltage drops.
When the battery voltage drops, the voltage-increase circuit (DC-DC converter) functions to increase the voltage of the SRS to normal voltage.
A malfunction in this circuit is not recorded in the center airbag sensor. The SRS warning light automatically goes off when the source voltage returns to normal.
The signal to illuminate the SRS warning light is transmitted from the center airbag sensor to the combination meter through the CAN communication system.

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System.Airbag System Srs Warning Light Remains On


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).
  2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).
  3. After replacing the center airbag sensor assembly, refer to initialization (Click here).
1.CHECK CAN COMMUNICATION SYSTEM

  1. Check if a CAN communication DTC is output.

    Result
    Result
    		Proceed to
    DTC is not output
    		A
    DTCs are output (for LHD with Central Gateway ECU)
    		B
    DTCs are output (for RHD with Central Gateway ECU)
    		C
    DTCs are output (for LHD without Central Gateway ECU)
    		D
    DTCs are output (for RHD without Central Gateway ECU)
    		E


B
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)

C
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)

D
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)

E
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (Click here)
A


2.CHECK BATTERY

  1. Measure the voltage of the battery.

    Standard Voltage:
    11 to 14 V


NG
REPLACE OR RECHARGE BATTERY
OK


3.CHECK CONNECTORS

  1. Turn the ignition switch off.

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

  1. Check that the connectors are properly connected to the center airbag sensor and combination meter.

    OK:
    The connectors are properly connected.


NG
CONNECT CONNECTORS PROPERLY
OK


4.CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF CENTER AIRBAG SENSOR)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System.Airbag System Srs Warning Light Remains On

  1. Disconnect the connectors from the center airbag sensor.

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

  1. Turn the ignition switch to ON.

  1. Operate all the components of the electrical system (defogger, wipers, headlights, heater blower, etc.).

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E47-21 (IG2) - E47-25 (E1)
    		Ignition switch ON
    		11 to 14 V
    E47-21 (IG2) - E47-26 (E2)
    		Ignition switch ON
    		11 to 14 V


NG
REPLACE INSTRUMENT PANEL WIRE
OK


5.CHECK HARNESS AND CONNECTOR (SOURCE VOLTAGE OF COMBINATION METER)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.Supplemental Restraint Systems.Airbag System.Airbag System Srs Warning Light Remains On

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

  1. Disconnect the connector from the combination meter.

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

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E119-21 (B) - E119-20 (ET)
    		Always
    		11 to 14 V
    E119-22 (IG+) - E119-20 (ET)
    		Ignition switch ON
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.CHECK SRS WARNING LIGHT (SHORT TO GROUND)

  1. Turn the ignition switch off.

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

  1. Connect the connector to the combination meter.

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

  1. Turn the ignition switch to ON.

  1. Check the SRS warning light condition.

    NOTICE:
    Make sure that nobody is in the vehicle.
    OK:
    After the primary check period, the SRS warning light goes off for approximately 10 seconds and then remains on.
    HINT:
    The primary check period is approximately 6 seconds after the ignition switch is turned to ON.


NG
GO TO METER / GAUGE SYSTEM (Click here)
OK

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)