Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Trouble in Passenger Airbag ON/OFF Indicator

DESCRIPTION

The occupant classification system detects the front passenger seat condition. It then displays the instrument panel passenger airbag assembly and lower No. 2 instrument panel airbag assembly condition (activated/not activated) using the passenger airbag ON/OFF indicator.

HINT:

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.

CAUTION / NOTICE / HINT

NOTICE:

• After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

  Click here

• Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

(a) Turn the engine switch on (IG), and check the SRS warning light condition.

OK:

After the primary check period, the SRS warning light turns off.

HINT:

The primary check is performed for approximately 6 seconds after the engine switch is turned on (IG).

NG

GO TO AIRBAG SYSTEM

OK

(a) Using the Techstream, perform Zero Point Calibration.

Click here

OK:

"Zero Point Calibration is complete." is displayed.

OK

END

NG

(a) Loosen the 4 installation bolts of the front seat assembly RH.

(b) Tighten the 4 installation bolts of the front seat assembly RH to the specified torque.

Click here

NEXT

(a) Using the Techstream, perform Zero Point Calibration.

Click here

OK:

"Zero Point Calibration is complete." is displayed.

OK

END

NG

(a) Turn the engine switch off.

(b) Connect the Techstream to the DLC3.

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

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Occupant Detection / Data List.

(f) Read the Data List according to the display on the Techstream.

OK:

The Techstream display changes correctly in accordance with the operation of the front passenger side buckle switch.

NG

GO TO STEP 9

OK

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

(c) Disconnect the connectors from the occupant detection ECU, front occupant classification sensor LH and rear occupant classification sensor LH.

(d) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

(a) Connect the connectors to the front occupant classification sensor LH and rear occupant classification sensor LH.

(b) Replace the occupant detection ECU.

Click here

(c) Connect the cable to the negative (-) battery terminal.

NEXT

(a) Using the Techstream, perform Zero Point Calibration.

Click here

NEXT

END

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

(c) Disconnect the connectors from the occupant detection ECU and front seat inner belt assembly RH.

(d) Check that the terminals of the connectors are not deformed or damaged.

OK:

The terminals are not deformed or damaged.

NG

REPLACE FRONT SEAT WIRE RH

OK

(a) Turn the engine switch off.

(b) Disconnect the cable from the negative (-) battery terminal.

(c) Replace the front seat inner belt assembly RH.

Click here

(d) Connect the cable to the negative (-) battery terminal.

NEXT

(a) Using the Techstream, perform Zero Point Calibration.

Click here

NEXT

END