Toyota Yaris: Airbag System / Operation Check

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Supplemental Restraint Systems / Airbag System / Operation Check

OPERATION CHECK

PRECAUTION FOR OPERATION CHECK

Be sure to read Precaution thoroughly before servicing.
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Be sure to correctly follow the removal and installation procedures for the SRS parts.

NOTICE:

If there is any damage or deformation of airbag installation components or the areas they are installed to, do not attempt to repair them. Replace the damaged components with new ones.

CHECK SRS WARNING LIGHT

(a) Primary check

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

(2) Turn the ignition switch off. Wait for at least 2 seconds, then turn the ignition switch to ON. The SRS warning light comes on for approximately 6 seconds and diagnosis of the airbag system is performed.

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 in the SRS airbag system.
If the SRS 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 SRS 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 power source voltage drop. The SRS warning light turns off 6 to 10 seconds after the power source voltage returns to normal.

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

(a) Initial check

(1) Turn the ignition switch to ON.

(2) The passenger airbag ON/OFF indicator comes on for approximately 4 seconds, then turns off for approximately 2 seconds.

(3) Approximately 6 seconds after the ignition switch is turned to ON, the passenger airbag ON/OFF indicator will indicate ON/OFF according to the airbag cut off switch cylinder sub-assembly condition as listed below.

Indicator Operation

Airbag Cut Off Switch Cylinder Sub-assembly Condition	Passenger Airbag ON/OFF Indicator		SRS Warning Light
Airbag Cut Off Switch Cylinder Sub-assembly Condition	ON Indicator	OFF Indicator	SRS Warning Light
*1: The ON indicator illuminates for approximately 60 seconds and then turns off.
ON	ON*1	OFF	OFF
OFF	OFF	ON	OFF
Switch failure	OFF	ON	ON

HINT:

If the SRS warning light is not illuminated and the passenger airbag ON/OFF indicator does not operate as specified in the table according to the airbag cut off switch cylinder sub-assembly status, no related DTCs will be stored. Proceed to the Trouble in Passenger Airbag ON/OFF Indicator troubleshooting procedure.

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CHECK PASSENGER AIRBAG ON/OFF INDICATOR

(a) Turn the ignition switch to ON.

(b) Check that the passenger airbag ON/OFF indicator ("ON" and "OFF") comes on for approximately 4 seconds, then turns off for approximately 2 seconds.

HINT:

Refer to the indicator operation table in Function of Passenger Airbag ON/OFF Indicator for the passenger airbag ON/OFF indicator operation when the ignition switch is turned to ON and approximately 6 seconds elapse.

INSPECT AIRBAG COMPONENTS

(a) 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.
Instrument panel passenger without door airbag assembly	Perform a diagnostic system check. Visually check for defects with the instrument panel passenger without door airbag assembly installed to the vehicle. HINT: The defects are as follows: Cuts on the instrument panel safety pad assembly around the instrument panel passenger without door airbag assembly Small cracks on the instrument panel safety pad assembly around the instrument panel passenger without door airbag assembly Significant discoloration on the instrument panel safety pad assembly around the instrument panel passenger without door airbag assembly OK: No defects are found. If any defects are found, replace the instrument panel safety pad 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 separate type front seatback assembly around the front seat airbag assemblies Small cracks on the separate type front seatback assembly around the front seat airbag assemblies Significant discoloration on the separate type 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 cover with pad 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.
Airbag sensor assembly	Perform a diagnostic system check.
Front airbag sensor
Side airbag pressure sensor
No. 1 side airbag sensor
Harness and connector

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