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SRS Warning Light Remains ON: Procedure

  1. CHECK SRS WARNING LIGHT OPERATION 
    1. Check the SRS warning light operation approximately 6 seconds after the ignition switch is turned to ON.

      Result

      SRS Warning Light Illumination Proceed to
      Remains on A
      Goes off and then comes on again B

    B → See step   6 

    A: Go to next step 

  2. CHECK BATTERY VOLTAGE 
    1. Measure the voltage of the battery.

      Standard Voltage

      11 to 14 V

    NG → See step   14 

    OK: Go to next step 

  3. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      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 airbag ECU assembly.

      OK

      The connector is properly connected.

      HINT: 

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

    4. Disconnect the connector from the airbag ECU 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: Go to next step 

  4. CHECK WIRE HARNESS (AIRBAG ECU ASSEMBLY - BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY392835Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    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 Condition Specified Condition
      D27-21 (IG) - Body ground Ignition switch ON 8 to 16 V
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D27-25 (GND) - Body ground Always Below 1 Ω
      D27-26 (GND) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Airbag ECU Assembly)

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  5. CHECK SRS WARNING LIGHT 
    1. Turn the ignition switch to ON.
    2. 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.

      HINT: 

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

    NG → See step   15 

    OK → See step   13 

  6. CHECK CAN COMMUNICATION SYSTEM 
    1. Use the Techstream to check if the CAN communication system is functioning normally.

      HINT: 

      • Refer to Bus Check for the CAN communication system. Refer to DIAGNOSIS SYSTEM [07/2013 - 12/2013] .
      • The airbag ECU 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

    B → See step   16 

    A: Go to next step 

  7. CHECK BATTERY VOLTAGE 
    1. Measure the voltage of the battery.

      Standard Voltage

      11 to 14 V

    NG → See step   14 

    OK: Go to next step 

  8. CHECK CONNECTOR 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      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 airbag ECU assembly.

      OK

      The connector is properly connected.

      HINT: 

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

    4. Disconnect the connector from the airbag ECU 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: Go to next step 

  9. CHECK WIRE HARNESS (AIRBAG ECU ASSEMBLY - BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY392835Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    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 Condition Specified Condition
      D27-21 (IG) - Body ground Ignition switch ON 8 to 16 V
    5. Turn the ignition switch off.
    6. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D27-25 (GND) - Body ground Always Below 1 Ω
      D27-26 (GND) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Airbag ECU Assembly)

    NG → REPLACE WIRE HARNESS 

    OK: Go to next step 

  10. CHECK CONNECTOR 
    1. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      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.

      HINT: 

      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.

    NG → REPAIR OR REPLACE CONNECTOR 

    OK: Go to next step 

  11. CHECK WIRE HARNESS (COMBINATION METER ASSEMBLY - BODY GROUND) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY392874Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      D7-1 (B) - Body ground Always 11 to 14 V
      D7-2 (IG+) - Body ground Ignition switch ON 11 to 14 V
    4. Turn the ignition switch off.
    5. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D7-20 (ES1) - Body ground Always Below 1 Ω
      D7-40 (ES2) - Body ground Always Below 1 Ω
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Assembly)

    NG → REPAIR OR REPLACE WIRE HARNESS 

    OK: Go to next step 

  12. CHECK SRS WARNING LIGHT 
    1. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

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

    2. Connect the connector to the combination meter assembly.
    3. Connect the cable to the negative (-) battery terminal.
    4. Turn the ignition switch to ON.
    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 on.

      HINT: 

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

    NG → See step   15 

    OK → See step   13 

  13. REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [07/2013 - ] 
  14. INSPECT CHARGING SYSTEM AND BATTERY. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2013 - ] 
  15. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2013 - ] 
  16. GO TO CAN COMMUNICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [07/2013 - 12/2013] 
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