Toyota Avalon (XX50): Center Airbag Sensor Assembly

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Supplemental Restraint Systems / Center Airbag Sensor Assembly

Components

COMPONENTS

ILLUSTRATION

*A	for Gasoline Model	-	-
*1	REAR CENTER SEAT OUTER BELT ASSEMBLY	*2	REAR SEAT CUSHION ASSEMBLY
*3	REAR SEAT CUSHION LOCK HOOK	-	-
●	Non-reusable part	-	-

ILLUSTRATION

*A	for Gasoline Model	*B	for HV Model
*1	CENTER PILLAR LOWER GARNISH LH	*2	COWL SIDE TRIM SUB-ASSEMBLY LH
*3	FRONT DOOR OPENING TRIM WEATHERSTRIP LH	*4	FRONT DOOR SCUFF PLATE LH
*5	NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY	*6	REAR DOOR OPENING TRIM WEATHERSTRIP LH
*7	REAR DOOR SCUFF PLATE LH	-	-

ILLUSTRATION

*A	for Gasoline Model	*B	for HV Model
*1	CENTER PILLAR LOWER GARNISH RH	*2	COWL SIDE TRIM SUB-ASSEMBLY RH
*3	FRONT DOOR OPENING TRIM WEATHERSTRIP RH	*4	FRONT DOOR SCUFF PLATE RH
*5	NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY	*6	REAR DOOR OPENING TRIM WEATHERSTRIP RH
*7	REAR DOOR SCUFF PLATE RH	-	-

ILLUSTRATION

*1	ACCELERATOR PEDAL	*2	ACCELERATOR PEDAL PAD
*3	FRONT FLOOR CARPET ASSEMBLY	*4	FRONT FLOOR CARPET CLIP
	Nm (kgfcm, ft.*lbf): Specified torque	-	-

ILLUSTRATION

*1	AIRBAG ECU ASSEMBLY	*2	NO. 1 CONSOLE BOX DUCT
	Tightening torque for "Major areas involving basic vehicle performance such as moving/turning/stopping": Nm (kgfcm, ft.*lbf)	-	-

Installation

INSTALLATION

PROCEDURE

1. INSTALL AIRBAG ECU ASSEMBLY

(a) Check that the engine switch (for Gasoline Model) or power switch (for HV Model) is off.

(b) Check that the cable is disconnected from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

Torque:

17.5 N·m {178 kgf·cm, 13 ft·lbf}

NOTICE:

Temporarily tighten the 2 bolts in the order of (A), (B) and then fully tighten the 3 bolts in the order of (C), (A) and (B).
If the airbag ECU assembly has been dropped, or there are any cracks, dents or other defects in the case or connector, replace it with a new one.
When installing the airbag ECU assembly, make sure that the wire harness does not interfere with other parts and is not pinched.
When the engine switch (for Gasoline Model) or power switch (for HV Model) is first turned on (IG) after the airbag ECU assembly has been replaced, make sure that no one is in the vehicle.

(d) Temporarily connect the connector and then move the lock lever in the direction indicated by the arrow to securely connect the connectors.

NOTICE:

When connecting any airbag connector, take care not to damage the airbag wire harness.

*a	Lock Lever
	Move in this Direction

(e) Check that there is no looseness in the installed parts of the airbag ECU assembly.

2. INSTALL NO. 1 CONSOLE BOX DUCT

(a) Install the No. 1 console box duct with the clip as shown in the illustration.

Install in this Direction

3. INSTALL FRONT FLOOR CARPET ASSEMBLY

(a) Install the front floor carpet assembly to its original position as shown in the illustration.

(b) Engage the 2 guides.

(d) Install the front floor carpet assembly to its original position as shown in the illustration.

(e) Engage the 2 guides.

(f) Install the 3 front floor carpet clips.

4. INSTALL ACCELERATOR PEDAL

for 2GR-FKS: Click here

for A25A-FXS: Click here

5. INSTALL ACCELERATOR PEDAL PAD

for 2GR-FKS: Click here

for A25A-FXS: Click here

6. INSTALL NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

Click here

7. INSTALL CENTER PILLAR LOWER GARNISH LH

Click here

8. CONNECT REAR DOOR OPENING TRIM WEATHERSTRIP LH

9. INSTALL REAR DOOR SCUFF PLATE LH (for Gasoline Model)

Click here

10. INSTALL REAR DOOR SCUFF PLATE LH (for HV Model)

Click here

11. CONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP LH

12. INSTALL COWL SIDE TRIM SUB-ASSEMBLY LH

Click here

13. INSTALL FRONT DOOR SCUFF PLATE LH

Click here

14. INSTALL NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

Click here

15. INSTALL CENTER PILLAR LOWER GARNISH RH

HINT:

Use the same procedure as for the LH side.

Click here

16. CONNECT REAR DOOR OPENING TRIM WEATHERSTRIP RH

17. INSTALL REAR DOOR SCUFF PLATE RH (for Gasoline Model)

HINT:

Use the same procedure as for the LH side.

Click here

18. INSTALL REAR DOOR SCUFF PLATE RH (for HV Model)

HINT:

Use the same procedure as for the LH side.

Click here

19. CONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP RH

20. INSTALL COWL SIDE TRIM SUB-ASSEMBLY RH

HINT:

Use the same procedure as for the LH side.

Click here

21. INSTALL FRONT DOOR SCUFF PLATE RH

HINT:

Use the same procedure as for the LH side.

Click here

22. INSTALL REAR SEAT CUSHION LOCK HOOK (for Gasoline Model)

Click here

23. INSTALL REAR SEAT CUSHION ASSEMBLY (for Gasoline Model)

Click here

24. CONNECT REAR CENTER SEAT OUTER BELT ASSEMBLY (for Gasoline Model)

Click here

25. INSTALL CONSOLE ASSEMBLY

Click here

26. INSTALL FRONT SEAT ASSEMBLY

(a) Install the front seat assembly LH and front seat assembly RH.

Click here

27. PERFORM DIAGNOSTIC SYSTEM CHECK

for Gasoline Model: Click here

for HV Model: Click here

28. PERFORM YAW RATE AND ACCELERATION SENSOR ZERO POINT CALIBRATION

(a) When the airbag ECU assembly is replaced, perform zero point learning for the yaw rate and acceleration sensor.

for Gasoline Model: Click here

for HV Model: Click here

HINT:

The yaw rate and acceleration sensor is built into the airbag ECU assembly.

On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Be sure to correctly follow the removal and installation procedures for the airbag ECU assembly.

PROCEDURE

1. INSPECT AIRBAG ECU ASSEMBLY (for Vehicle not Involved in Collision)

(a) Perform a diagnostic system check.

for Gasoline Model: Click here

for HV Model: Click here

2. INSPECT AIRBAG ECU ASSEMBLY (for Vehicle Involved in Collision and Airbag not Deployed)

(a) Perform a diagnostic system check.

for Gasoline Model: Click here

for HV Model: Click here

(b) Visually check for defects with the airbag ECU assembly installed to the vehicle.

HINT:

The defects are as follows:

Cracks in the ECU housing
Dents in the ECU housing
Chips in the ECU housing
Cracks or other damage to the connectors
Peeling of the label

OK:

No defects are found.

If any defects are found, replace the airbag ECU assembly with a new one.

3. INSPECT AIRBAG ECU ASSEMBLY (for Vehicle Involved in Collision and Airbag is Deployed)

(a) Replace the airbag ECU assembly.

HINT:

The airbag ECU assembly should be replaced after any of the SRS parts has deployed, as it has been subjected to an impact.

Removal

REMOVAL

CAUTION / NOTICE / HINT

The necessary procedures (adjustment, calibration, initialization or registration) that must be performed after parts are removed and installed, or replaced during airbag ECU assembly removal/installation are shown below.

Necessary Procedures After Parts Removed/Installed/Replaced (for Gasoline Model)

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed
*: When performing learning using the Techstream. Click here
Replacement of the airbag ECU assembly	Perform system variant learning and acceleration sensor zero point calibration	VSC is disabled or malfunctions DTCs are output Slip indicator light illuminates ABS warning light illuminates
Removal/installation of the front passenger seat	Zero point calibration (Occupant Classification System)	Occupant Classification System Passenger airbag ON/OFF indicator Airbag System (Front passenger side) Seat Belt Warning System (Front passenger)
Disconnect cable from negative auxiliary battery terminal	Perform steering sensor zero point calibration	Lane Departure Alert System (w/ Steering Control)
		Pre-collision System
		Intelligent Clearance Sonar System*
		Lighting System (for Gasoline Model with Cornering Light)
	Memorize steering angle neutral point	Parking Assist Monitor System
	Memorize steering angle neutral point	Panoramic View Monitor System

Necessary Procedures After Parts Removed/Installed/Replaced (for HV Model)

Replaced Part or Performed Procedure	Necessary Procedure	Effect/Inoperative Function when Necessary Procedure not Performed
*: When performing learning using the Techstream. Click here
Replacement of the airbag ECU assembly	Clear zero point calibration data Perform yaw rate and acceleration sensor zero point calibration	DTCs are stored ABS warning light illuminates Brake warning light / yellow (minor malfunction) illuminates Slip indicator light illuminates VSC disabled or malfunctions
Removal/installation of the front passenger seat	Zero point calibration (Occupant classification system)	Occupant classification system Passenger airbag ON/OFF indicator Airbag system (Front passenger side) Seat belt warning system (Front passenger)
Disconnect cable from negative auxiliary battery terminal	Perform steering sensor zero point calibration	Lane Departure Alert System (w/ Steering Control)
		Pre-collision System
		Intelligent Clearance Sonar System*
		Lighting System (for HV Model with Cornering Light)
	Memorize steering angle neutral point	Parking Assist Monitor System
	Memorize steering angle neutral point	Panoramic View Monitor System

PROCEDURE

1. PRECAUTION

CAUTION:

Be sure to read Precaution thoroughly before servicing.

for Gasoline Model: Click here

for HV Model: Click here

NOTICE:

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

Click here

2. REMOVE FRONT SEAT ASSEMBLY

(a) Remove the front seat assembly LH and front seat assembly RH.

Click here

3. REMOVE CONSOLE ASSEMBLY

Click here

4. DISCONNECT REAR CENTER SEAT OUTER BELT ASSEMBLY (for Gasoline Model)

Click here

5. REMOVE REAR SEAT CUSHION ASSEMBLY (for Gasoline Model)

Click here

6. REMOVE REAR SEAT CUSHION LOCK HOOK (for Gasoline Model)

Click here

7. REMOVE FRONT DOOR SCUFF PLATE LH

Click here

8. REMOVE COWL SIDE TRIM SUB-ASSEMBLY LH

Click here

9. DISCONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP LH

HINT:

Disconnect the front door opening trim weatherstrip LH to the extent that allows the removal of the center pillar lower garnish LH.

10. REMOVE REAR DOOR SCUFF PLATE LH (for Gasoline Model)

Click here

11. REMOVE REAR DOOR SCUFF PLATE LH (for HV Model)

Click here

12. DISCONNECT REAR DOOR OPENING TRIM WEATHERSTRIP LH

HINT:

Disconnect the rear door opening trim weatherstrip LH to the extent that allows the removal of the center pillar lower garnish LH.

13. REMOVE CENTER PILLAR LOWER GARNISH LH

Click here

14. REMOVE NO. 1 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

Click here

15. REMOVE FRONT DOOR SCUFF PLATE RH

HINT:

Use the same procedure as for the LH side.

Click here

16. REMOVE COWL SIDE TRIM SUB-ASSEMBLY RH

HINT:

Use the same procedure as for the LH side.

Click here

17. DISCONNECT FRONT DOOR OPENING TRIM WEATHERSTRIP RH

HINT:

Disconnect the front door opening trim weatherstrip RH to the extent that allows the removal of the center pillar lower garnish RH.

18. REMOVE REAR DOOR SCUFF PLATE RH (for Gasoline Model)

HINT:

Use the same procedure as for the LH side.

Click here

19. REMOVE REAR DOOR SCUFF PLATE RH (for HV Model)

HINT:

Use the same procedure as for the LH side.

Click here

20. DISCONNECT REAR DOOR OPENING TRIM WEATHERSTRIP RH

HINT:

Disconnect the rear door opening trim weatherstrip RH to the extent that allows the removal of the center pillar lower garnish RH.

21. REMOVE CENTER PILLAR LOWER GARNISH RH

HINT:

Use the same procedure as for the LH side.

Click here

22. REMOVE NO. 2 INSTRUMENT PANEL UNDER COVER SUB-ASSEMBLY

Click here

23. REMOVE ACCELERATOR PEDAL PAD

for 2GR-FKS: Click here

for A25A-FXS: Click here

24. REMOVE ACCELERATOR PEDAL

for 2GR-FKS: Click here

for A25A-FXS: Click here

25. DISCONNECT FRONT FLOOR CARPET ASSEMBLY

(a) Remove the front floor carpet clip.

(b) Remove the 2 front floor carpet clips.

(d) Remove the front floor carpet clip.

(e) Remove the 2 front floor carpet clips.

(f) Disengage the 2 guides and turn back the front floor carpet assembly as shown in the illustration.

26. REMOVE NO. 1 CONSOLE BOX DUCT

(a) Remove the clip.

Remove in this Direction

(b) Remove the No. 1 console box duct as shown in the illustration.

27. REMOVE AIRBAG ECU ASSEMBLY

(a) Check that the engine switch (for Gasoline Model) or power switch (for HV Model) is off.

(b) Check that the cable is disconnected from the negative (-) auxiliary battery terminal.

CAUTION:

Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

(c) Push down the part (A) in the direction indicated by the arrow (1) to release the lock, and then move the lock lever in the direction indicated by the arrow (2) shown in the illustration to disconnect the connectors.

NOTICE:

When disconnecting any airbag connector, take care not to damage the airbag wire harness.

*a	Lock Lever
	Release the lock (1)
	Disconnect the connector (2)

(d) Remove the 3 bolts and airbag ECU assembly.

Vehicle Control History

Curtain Shield Airbag Assembly

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