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Home >> Toyota >> 2012 >> Yaris Base, Automatic Trans >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System (Sedan) (Diagnostic Codes & Symptom Tests) >> METER / GAUGE SYSTEM (for Sedan) >> Symptom Tests >> Warning Buzzer does not Sound >> Procedure

Warning Buzzer does not Sound: Procedure

  1. CHECK BUZZER (SEAT BELT, KEY REMINDER, TAILLIGHT REMINDER) 
    1. Check that the seat belt, key reminder and taillight reminder warning buzzers sound.

      Result

      Result Proceed to
      Seat belt warning buzzer does not sound
      (where equipped with seat belt warning system)      		 A
      Key reminder warning buzzer does not sound
      (where equipped with key reminder warning system)      		 B
      Taillight reminder warning buzzer does not sound
      (Meter illuminations normal)      		 C
      No warning buzzers sound D

      HINT: 

      • Seat belt warning buzzer on: Ignition switch is ON, driver or front passenger seat belt is unfastened, and vehicle speed is 12.4 mph (20 km/h) or more.
      • Key reminder warning buzzer on: Ignition switch is OFF, key is in ignition key cylinder, and driver side door is open.
      • Taillight reminder warning buzzer on: Ignition switch is OFF, taillight relay switch is ON, and driver side door is open.

    B → See step   8 

    C → See step   15 

    D → See step   5 

    A: Go to next step 

  2. CHECK SUPPLEMENTAL RESTRAINT SYSTEM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Enter the following menus: Body Electrical / SRS Airbag / Trouble Codes.

      Result

      Result Proceed to
      No SRS DTCs are output A
      SRS DTCs are output B

    B → See step   6 

    A: Go to next step 

  3. CHECK OCCUPANT CLASSIFICATION SYSTEM 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Enter the following menus: Body Electrical / Occupant Detection / Trouble Codes.

      Result

      Result Proceed to
      No occupant classification system DTCs are output A
      Occupant classification system DTCs are output B

    B → See step   7 

    A: Go to next step 

  4. CHECK KEY REMINDER FUNCTION 
    1. Ignition switch is OFF.
    2. Key is in ignition key cylinder.
    3. Driver side door is open.

      OK

      Key reminder warning buzzer ON.

    OK → REPLACE MAIN BODY ECU 

    NG → See step   5 

  5. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL 
  6. GO TO SUPPLEMENTAL RESTRAINT SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  7. GO TO OCCUPANT CLASSIFICATION SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  8. READ VALUE USING TECHSTREAM (FRONT DOOR COURTESY SWITCH (DRIVER SIDE)) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Select the item below from the Data List, and read the value displayed on the Techstream.

      Body Electrical / Main Body / Data List:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      D Door Courtesy SW Driver side door courtesy switch signal / ON or OFF ON: Driver door is open
      OFF: Driver door is closed      		 -

    NG → See step   13 

    OK: Go to next step 

  9. READ VALUE USING TECHSTREAM (UNLOCK WARNING SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Select the item below from the Data List, and read the value displayed on the Techstream.

      Body Electrical / Main Body / Data List:

      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Key Unlock Warning SW Unlock warning switch signal / ON or OFF ON: Key is in ignition key cylinder
      OFF: No key is in ignition key cylinder      		 -

    OK → See step   12 

    NG: Go to next step 

  10. INSPECT UNLOCK WARNING SWITCH ASSEMBLY 
    1. Disconnect the D19 unlock warning switch assembly connector.
      Fig 1: Inspecting Unlock Warning Switch Assembly
      GTY339431Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Remove the unlock warning switch assembly.
    3. Measure the resistance.

      Standard resistance

      Tester
      Connection      		 Condition Specified
      Condition
      1 - 2 Not pushed 10 k Ω or higher
      1 - 2 Pushed Below 1 Ω
    4. Reconnect the unlock warning switch assembly.

    NG → REPLACE UNLOCK WARNING SWITCH ASSEMBLY 

    OK: Go to next step 

  11. CHECK HARNESS AND CONNECTOR (UNLOCK WARNING SWITCH ASSEMBLY - MAIN BODY ECU) 
    1. Disconnect the D19 unlock warning switch connector.
      Fig 2: Identifying Unlock Warning Switch And Main Body ECU Connector Terminals
      GTY226803Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 4D main body ECU connector.
    3. Measure the resistance.

      Standard resistance

      Tester Connection Specified Condition
      D19-1 - 4D-7 (KSW) Below 1 Ω
      D19-2 - Body ground Below 1 Ω
    4. Reconnect the unlock warning switch connector.
    5. Reconnect the main body ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  12. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL 
  13. INSPECT FRONT DOOR COURTESY SWITCH (DRIVER SIDE) 
    1. Disconnect the J2 front door courtesy switch connector.
      Fig 3: Inspecting Front Door Courtesy Switch (Driver Side)
      GTY225876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester
      Connection      		 Condition Specified
      Condition
      J2-1 - Body ground Not pushed (ON) Below 1 Ω
      J2-1 - Body ground Pushed (OFF) 10 kΩ or higher
    3. Reconnect the front door courtesy switch connector.

    NG → See step   19 

    OK: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY SWITCH - MAIN BODY ECU) 
    1. Disconnect the J2 front door courtesy switch connector.
      Fig 4: Identifying J2 Front Door Courtesy Switch Connector And 4A Main Body ECU Connector
      GTY239095Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 4A main body ECU connector.
    3. Measure the resistance.

      Standard resistance

      Tester Connection Specified Condition
      J2-1 - 4A-21 (DCTY) Below 1 Ω
    4. Reconnect the front door courtesy switch connector.
    5. Reconnect the main body ECU connector.

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  15. READ VALUE USING TECHSTREAM (FRONT DOOR COURTESY SWITCH) 
    1. Connect the Techstream to the DLC3.
    2. Turn the ignition switch ON and turn the tester ON.
    3. Select the item below from the Data List, and read the value displayed on the Techstream.

      Body Electrical / Main Body / Data List:

      Item Measurement Item /
      Display (Range)      		 Normal Condition Diagnostic Note
      D Door Courtesy SW Driver door courtesy switch signal /
      ON or OFF      		 ON: Driver door is open
      OFF: Driver door is closed      		 -

    NG → See step   17 

    OK → See step   16 

  16. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL 
  17. INSPECT FRONT DOOR COURTESY SWITCH (DRIVER SIDE) 
    1. Disconnect the J2 front door courtesy switch assembly connector.
      Fig 5: Inspecting Front Door Courtesy Switch (Driver Side)
      GTY225876Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance.

      Standard resistance

      Tester
      Connection      		 Condition Specified
      Condition
      J2-1 - Body ground Not pushed (ON) Below 1 Ω
      J2-1 - Body ground Pushed (OFF) 10kΩ or higher
    3. Reconnect the front door courtesy switch connector.

    NG → See step   19 

    OK: Go to next step 

  18. CHECK HARNESS AND CONNECTOR (FRONT DOOR COURTESY SWITCH - MAIN BODY ECU) 
    1. Disconnect the J2 front door courtesy switch connector.
      Fig 6: Identifying J2 Front Door Courtesy Switch Connector And 4A Main Body ECU Connector
      GTY344124Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the 4A main body ECU connector.
    3. Measure the resistance.

      Standard resistance

      Tester Connection Specified Condition
      J2-1 - 4A-21 (DCTY) Below 1 Ω
    4. Reconnect the front door courtesy switch connector.
    5. Reconnect the main body ECU connector.

    NG → See step   19 

    OK → REPLACE MAIN BODY ECU 

  19. REPLACE FRONT DOOR COURTESY SWITCH (DRIVER SIDE). Refer to  REMOVAL 
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