Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Operation Check

OPERATION CHECK

PRECAUTION FOR OPERATION CHECK

CAUTION:

Use the correct procedure to replace the airbag parts.

CHECK SRS WARNING LIGHT

(a) Primary check

(1) Turn the engine switch on (IG) and check that the SRS warning light comes on.

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

NOTICE:

Turn the engine switch off when the battery is connected.

HINT:

• If the SRS warning light remains on for approximately 6 seconds or more after the engine switch has been turned on (IG), 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 engine switch has been turned on (IG), 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 engine 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 10 seconds after the power source voltage returns to normal.

FUNCTION OF PASSENGER AIRBAG ON/OFF INDICATOR

(a) Initial check

(1) Turn the engine switch on (IG).

(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 engine switch is turned on (IG), the passenger airbag ON/OFF indicator will indicate ON/OFF depending on the following conditions.

• *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 restrain 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 passenger airbag ON/OFF indicator illuminates based on the following timing chart in order to check the indicator light circuit.
• When the occupant classification system is malfunctioning, both the SRS warning light and passenger airbag ON/OFF indicator ("OFF") come on. In this case, perform troubleshooting for the airbag system DTCs first.

PASSENGER AIRBAG ON/OFF INDICATOR CHECK

(a) Turn the engine switch on (IG).

(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 engine switch is turned on (IG) and approximately 6 seconds elapse.

CHECK HORN BUTTON ASSEMBLY

Click here

CHECK INSTRUMENT PANEL PASSENGER AIRBAG ASSEMBLY

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CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY

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CHECK LOWER NO. 2 INSTRUMENT PANEL AIRBAG ASSEMBLY

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CHECK FRONT SEAT AIRBAG ASSEMBLY

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CHECK REAR SEAT AIRBAG ASSEMBLY

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CHECK CURTAIN SHIELD AIRBAG ASSEMBLY

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CHECK FRONT SEAT OUTER BELT ASSEMBLY

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CHECK REAR SEAT 3 POINT TYPE BELT ASSEMBLY

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CHECK AIRBAG ECU ASSEMBLY

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CHECK FRONT AIRBAG SENSOR

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CHECK SIDE AIRBAG PRESSURE SENSOR

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CHECK SIDE NO. 1 AIRBAG SENSOR

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CHECK SIDE NO. 2 AIRBAG SENSOR

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CHECK SEAT POSITION AIRBAG SENSOR

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CHECK OCCUPANT DETECTION ECU

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CHECK HARNESS AND CONNECTOR

(a) for Vehicle not Involved in Collision

(1) Perform a diagnostic system check.

(b) for Vehicle Involved in Collision and Airbag not Deployed

(1) Perform a diagnostic system check.

(c) for Vehicle Involved in Collision and Airbag is Deployed

(1) Perform a diagnostic system check.

(2) Check any of the wire harnesses in exposed contact with the airbag wire harness for damage.

(3) Check the connector of the airbag wire harness for scratches, cracks or damage.