2012 Toyota Prius ThreeFACTORY OEM SERVICE PROCEDURE

Diagnosis System

WARNING: This page is about a different variant/trim than selected.
  1. CHECK DLC3 
    1. Check the DLC3. Refer to GENERAL INFORMATION .
  2. FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Initial check
      1. Turn the power switch on (IG).
      2. The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, then goes off for approximately 2 seconds.
      3. Approximately 6 seconds after the power switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the conditions listed below.
        INDICATOR OPERATION

        Front Passenger Seat Condition Passenger Airbag ON/OFF Indicator SRS Warning Light
        ON Indicator OFF Indicator
        Vacant OFF OFF OFF
        Adult is seated. ON OFF OFF
        Child is seated. OFF ON OFF
        Child restraint system is installed.
        Occupant classification system failure OFF ON ON

        HINT: 

        • The passenger airbag ON/OFF indicator illuminates based on the timing chart below in order to check the indicator light circuit.
        • When the occupant classification system has trouble, both the SRS warning light and passenger airbag ON/OFF indicator ("OFF") come on. In this case, check the DTCs in the airbag system first.
        Fig 1: Identifying Occupant Classification System Timing Chart
        GTY330722Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Turn the power switch on (IG).
      Fig 2: Identifying Passenger Airbag On/Off Indicator
      GTY231290Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that the passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then goes off for approximately 2 seconds.

      HINT: 

      Refer to the indicator operation table in the preceding step regarding the passenger airbag ON/OFF indicator when the power switch is turned on (IG) and approximately 6 seconds elapse.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.