AIRBAG SYSTEM SRS Warning Light does not Come ON

DESCRIPTION

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

When the SRS is normal, the SRS warning light comes on for approximately 6 seconds after the power switch is turned from off 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 ECU 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 ECU 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 ECU assembly to the combination meter sub-assembly through the CAN communication system.

WIRING DIAGRAM

A005D5ZE01

CAUTION / NOTICE / HINT

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.

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK AUXILIARY BATTERY VOLTAGE


    1. Measure the voltage of the auxiliary battery.

      Standard Voltage
      11 to 14 V

    NG

    INSPECT CHARGING SYSTEM AND AUXILIARY BATTERY Click here

    OK

  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 sub-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 sub-assembly.

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

      OK
      The terminal is not deformed or damaged.

    NG

    REPAIR OR REPLACE CONNECTOR

    OK

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


    1. A005DUKE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Sub-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
      L27-2 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      L27-1 (B) - Body ground Power switch off 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
      L27-11 (ES) - Body ground Always Below 1 Ω

    NG

    REPAIR OR 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 sub-assembly.

    3. Disconnect the connector from the airbag ECU 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).


    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

    REPLACE METER CIRCUIT PLATE Click here