AIRBAG SYSTEM SRS Warning Light does not Come ON

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 power 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 airbag sensor assembly in case the source voltage drops.

When the auxiliary 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 stored in the 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 airbag sensor assembly to the combination meter assembly through the CAN communication system.

WIRING DIAGRAM

A003WU2E01

INSPECTION PROCEDURE

Note

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.

PROCEDURE


  1. CHECK AUXILIARY BATTERY VOLTAGE


    1. Measure the voltage of the auxiliary battery.

      Standard Voltage
      11 to 14 V
      Result
      Result Proceed to
      OK A
      NG (for 2ZR-FXE) B
      NG (for 5ZR-FXE) C

    B

    INSPECT AUXILIARY BATTERY Click here

    C

    INSPECT AUXILIARY BATTERY Click here

    A

  2. CHECK CONNECTOR


    1. Turn the power switch off.

    2. 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.

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

      OK
      The connector is properly connected.

      Tech Tips

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

    4. Disconnect the connector from the combination meter assembly.

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

      OK
      The terminal is not deformed or damaged.

    NG

    REPLACE WIRE HARNESS

    OK

  3. CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND)


    1. A003YWVE11
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      H19-21 (IG2) - Body ground Power switch on (IG) 11 to 14 V
      H19-22 (B) - Body ground Always 11 to 14 V

    4. Turn the power switch off.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H19-33 (EP) - Body ground Always Below 1 Ω

    NG

    REPLACE WIRE HARNESS

    OK

  4. CHECK SRS WARNING LIGHT


    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.

    2. Connect the connector to the combination meter assembly.

    3. Disconnect the connector from the airbag sensor assembly.

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

    5. Turn the power switch on (IG).

    6. 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 on.

      Tech Tips

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


    NG

    REPLACE COMBINATION METER ASSEMBLY Click here

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here