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AIRBAG SYSTEM SRS Warning Light Remains ON

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DTC Code DTC Name
  SRS Warning Light Remains ON
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DESCRIPTION

The SRS warning light is located on the combination meter assembly.

When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the engine switch is turned from off to on (IG), 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, the DTC is displayed by blinking of the SRS warning light.

The SRS is equipped with a voltage-increase circuit (DC-DC converter) in the center airbag sensor assembly 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. In addition, when the voltage drops, the SRS warning light will illuminate.

A malfunction in this circuit is not recorded in the center airbag sensor assembly. 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 assembly to the combination meter assembly through the CAN communication system.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK SRS WARNING LIGHT OPERATION


    1. Check the SRS warning light operation approximately 6 seconds after the engine switch is turned on (IG).

      Result
      SRS Warning Light Illumination Proceed to
      Remains on A
      Remains on after it goes off B

  2. Click here

    CHECK BATTERY VOLTAGE


    1. Measure the voltage of the battery.

      Standard Voltage
      11 to 14 V
      Table 1. Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 1AR-FE) C

  3. Click here

    CHECK CONNECTOR


    1. Turn the engine switch off.

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

      Note:

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

    3. Check that the connector is properly connected to the center airbag sensor assembly.

      OK
      The connector is properly connected.
      Tip:

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the center airbag sensor assembly.

    5. Check that the terminal of the connector is not damaged.

      OK
      The terminal is not deformed or damaged.

  4. Click here

    CHECK WIRE HARNESS (CENTER AIRBAG SENSOR ASSEMBLY - BODY GROUND)


    1. A019M3ZE02

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

    2. Turn the engine switch on (IG).

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F29-21 (IG2) - Body ground Engine switch on (IG) 8 to 16 V

    5. Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F29-25 (E1) - Body ground Always Below 1 Ω
      F29-26 (E2) - Body ground Always Below 1 Ω
      Table 2. Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

  5. Click here

    CHECK SRS WARNING LIGHT


    1. Turn the engine switch off.

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

      Note:

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

    3. Disconnect the connector from the center airbag sensor assembly.

    4. Turn the engine switch on (IG).

    5. Check the SRS warning light condition.

      OK
      After the primary check period, SRS warning light goes off for approximately 10 seconds and turns back.
      Tip:

      The primary check period is approximately 6 seconds after the engine switch is turned on (IG).


  6. Click here

    CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Tip:

      • Refer to Bus Check for the CAN communication system (Click here).

      • The center airbag sensor assembly is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output B

  7. Click here

    CHECK BATTERY VOLTAGE


    1. Measure the voltage of the battery.

      Standard Voltage
      11 to 14 V
      Table 3. Result
      Result Proceed to
      OK A
      NG (for 2GR-FE) B
      NG (for 1AR-FE) C

  8. Click here

    CHECK CONNECTOR


    1. Turn the engine switch off.

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

      Note:

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

    3. Check that the connector is properly connected to the center airbag sensor assembly.

      OK
      The connector is properly connected.
      Tip:

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    4. Disconnect the connector from the center airbag sensor assembly.

    5. Check that the terminal of the connector is not damaged.

      OK
      The terminal is not deformed or damaged.

  9. Click here

    CHECK WIRE HARNESS (CENTER AIRBAG SENSOR ASSEMBLY - BODY GROUND)


    1. A019M3ZE02

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

    2. Turn the engine switch on (IG).

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F29-21 (IG2) - Body ground Engine switch on (IG) 8 to 16 V

    5. Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F29-25 (E1) - Body ground Always Below 1 Ω
      F29-26 (E2) - Body ground Always Below 1 Ω
      Table 4. Text in Illustration
      *1

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

  10. Click here

    CHECK CONNECTOR


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

      Note:

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

    2. Check that the connector is properly connected to the combination meter assembly.

      OK
      The connector is properly connected.
      Tip:

      If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

    3. Disconnect the connector from the combination meter assembly.

    4. Check that the terminal of the connector is not damaged.

      OK
      The terminal is not deformed or damaged.

  11. Click here

    CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND)


    1. A019LN5E02

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

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      F16-1 (IG+) - Body ground Engine switch on (IG) 11 to 14 V
      F16-13 (B) - Body ground Always 11 to 14 V

    4. Turn the engine switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F16-6 (ES) - Body ground Always Below 1 Ω
      Table 5. Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)

  12. Click here

    CHECK SRS WARNING LIGHT


    1. Connect the connector to the combination meter assembly.

    2. Turn the engine switch off.

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

      Note:

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

    4. Turn the engine switch on (IG).

    5. Check the SRS warning light condition.

      OK
      After the primary check period, the SRS warning light goes off for approximately 10 seconds and turns back.
      Tip:

      The primary check period is approximately 6 seconds after the engine switch is turned on (IG).


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    INSPECT CHARGING SYSTEM AND BATTERYClick here

  14. Click here

    REPLACE WIRE HARNESS

  15. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  16. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

  17. Click here

    GO TO CAN COMMUNICATION SYSTEMClick here

  18. Click here

    INSPECT CHARGING SYSTEM AND BATTERYClick here