Operation Check [11/2023 - ]

PRECAUTION FOR OPERATION CHECK

WARNING:

Use the correct procedure to replace the airbag parts.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CHECK SRS WARNING LIGHT

Primary check

Turn the ignition switch to ON and check that the SRS warning light turns on.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Turn the ignition switch off. Wait for at least 2 seconds, and then turn the ignition switch to ON. The SRS warning light comes on for approximately 6 seconds and diagnosis of the airbag system (including the seat belt pretensioners) is performed.
NOTE:
Turn the ignition switch off when the auxiliary battery is connected.

HINT:
- If the SRS warning light remains on for approximately 6 seconds or more after the ignition switch has been turned to ON, there may be a malfunction with the airbag system.
- If the warning light occasionally turns on approximately 6 seconds or more after the ignition switch has been turned to ON, there may be a short to +B, short to ground or an open in the SRS warning light circuit.
- If the warning light illuminates after turning the ignition switch off or to ACC, there may be a malfunction in the power source circuit or combination meter assembly.
- The SRS warning light turns off, and then turns on. This blinking pattern indicates a source voltage drop. The SRS warning light turns off 6 to 10 seconds after the source voltage returns to normal.

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

Initial check

Turn the ignition switch to ON.

The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, and then goes off for approximately 2 seconds.

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

*A	for Type A
*B	for Type B

Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.

INDICATOR OPERATION

Front Passenger Seat Condition	Passenger Airbag ON/OFF Indicator		SRS Warning Light
Front Passenger Seat Condition	ON Indicator	OFF Indicator	SRS Warning Light
Vacant	OFF	ON	OFF
Adult*1 is seated	ON	OFF	OFF
Child*2 is seated	ON or OFF*2	OFF or ON*2	OFF
Child restraint system is installed	OFF	ON	OFF
Occupant classification system failure	OFF	ON	ON

*1: The system judges a person of average adult weight or more as an adult. If a smaller adult sits in the front passenger seat, the system may not recognize them as an adult depending on their physique and posture.
*2: The system may not recognize a child or a child in a child restraint system as a child depending on factors such as the positioning of the child restraint system or the child's physique or posture.

HINT:

The timing chart below shows the operation of the passenger airbag ON/OFF indicator. Use the chart 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 for DTCs for "Airbag System" first.

INSPECT AIRBAG COMPONENTS

Inspect the SRS parts in table below.

Component to Inspect	Procedure
Horn button assembly	Perform a diagnostic system check. Visually check for defects with the horn button assembly installed to the vehicle. HINT: The defects are as follows: Cuts on the surface or in the grooves Small cracks on the surface or in the grooves Significant discoloration on the surface or in the grooves OK No defects are found. If any defects are found, replace the horn button assembly with a new one.
Lower No. 1 instrument panel airbag assembly	Perform a diagnostic system check. Visually check for defects with the lower No. 1 instrument panel airbag assembly installed to the vehicle. HINT: The defects are as follows: Cuts Small cracks Significant discoloration OK No defects are found. If any defects are found, replace the lower No. 1 instrument panel airbag assembly with a new one.
Instrument panel passenger airbag assembly	Perform a diagnostic system check. Visually check for defects with the instrument panel passenger airbag assembly installed to the vehicle. HINT: The defects are as follows: Cuts on the instrument panel safety pad sub-assembly around the instrument panel passenger airbag assembly Small cracks on the instrument panel safety pad sub-assembly around the instrument panel passenger airbag assembly Significant discoloration on the instrument panel safety pad sub-assembly around the instrument panel passenger airbag assembly OK No defects are found. If any defects are found, replace the instrument panel safety pad sub-assembly with a new one.
Curtain shield airbag assembly	Perform a diagnostic system check. Visually check for defects with the curtain shield airbag assemblies installed to the vehicle. HINT: The defects are as follows: Cuts on each pillar garnish or the roof headlining assembly around the curtain shield airbag assemblies Small cracks on each pillar garnish or the roof headlining assembly around the curtain shield airbag assemblies Significant discoloration on each pillar garnish or the roof headlining assembly around the curtain shield airbag assemblies OK No defects are found. If any defects are found, replace each pillar garnish or the roof headlining assembly with a new one.
Front seat airbag assembly	Perform a diagnostic system check. Visually check for defects with the front seat airbag assemblies installed to the vehicle. HINT: The defects are as follows: Scratches, broken or frayed threads on the surface of the front seatback assembly around the front seat airbag assemblies Small cracks in the front seatback assembly around the front seat airbag assemblies Significant discoloration on the front seatback assembly around the front seat airbag assemblies OK No defects are found. If any defects are found, replace the separate type front seatback pad or separate type front seatback cover with a new one.
Front seat cushion airbag assembly RH	Perform a diagnostic system check. Visually check for defects with the front seat cushion airbag assembly RH installed to the vehicle. HINT: The defects are as follows: Scratches, broken or frayed threads on the surface of the front seat cushion assembly around the front seat cushion airbag assembly RH Small cracks on the front seat cushion assembly around the front seat cushion airbag assembly RH Significant discoloration on the front seat cushion assembly around the front seat cushion airbag assembly RH OK No defects are found. If any defects are found, replace the separate type front seat cushion pad or separate type front seat cushion cover with a new one.
Front seat outer belt assembly	Perform a diagnostic system check. Visually check for defects with the front seat outer belt assemblies installed to the vehicle. HINT: The defects are as follows: Cuts Small cracks Significant discoloration OK No defects are found. If any defects are found, replace the front seat outer belt assembly with a new one.
Rear seat outer belt assembly	Perform a diagnostic system check. Visually check for defects with the rear seat outer belt assemblies installed to the vehicle. HINT: The defects are as follows: Cuts Small cracks Significant discoloration OK No defects are found. If any defects are found, replace the rear seat outer belt assembly with a new one.
Airbag sensor assembly	Check for DTCs and freeze frame data.
Front airbag sensor
Side airbag sensor assembly
Side No. 2 airbag sensor
Rear airbag sensor
Harness and connector