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

B001XOSE25

CAUTION / NOTICE / HINT

Note


  • 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.

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

  • After replacing the center airbag sensor assembly, refer to initialization Click here.

PROCEDURE


  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.

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

    3. 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)


    1. B001VVSE01
      *1 Rear view of wire harness connector: (to Center Airbag Sensor)

      Disconnect the connectors from the center airbag sensor.

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

    3. Turn the ignition switch to ON.

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

    5. 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)


    1. B001YUTE02
      *1 Front view of wire harness connector: (to Combination Meter)

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

    2. Disconnect the connector from the combination meter.

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

    4. 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.

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

    3. Connect the connector to the combination meter.

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

    5. Turn the ignition switch to ON.

    6. Check the SRS warning light condition.

      Note

      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.

      Tech Tips

      The primary check period is approximately 6 seconds after the ignition switch is turned to ON.


    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

    GO TO METER / GAUGE SYSTEM Click here