Toyota Avalon (XX50): Steering Pad

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Supplemental Restraint Systems / Steering Pad

Components

COMPONENTS

ILLUSTRATION

*A

for HV Model

-

-

*1

LUGGAGE TRIM SERVICE HOLE COVER

-

-

ILLUSTRATION

*1

HORN BUTTON ASSEMBLY

*2

LOWER NO. 2 STEERING WHEEL COVER

Installation

INSTALLATION

PROCEDURE

1. INSTALL HORN BUTTON 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) When using a new spiral cable sub-assembly:

(1) Engage the wire harness clamp and disconnect the airbag connector as shown in the illustration.

*a

Wire Harness Clamp

*b

Airbag Connector

Remove in this Direction

HINT:

Be sure to engage the wire harness clamp until it is locked.

(d) When reusing a spiral cable sub-assembly or spiral cable with sensor sub-assembly:

*a

Airbag Connector

*b

Horn Connector

*c

Airbag Connector Locking Button

*d

Wire Harness Clamp

Push in this Direction

(1) Engage the wire harness clamp.

HINT:

Be sure to engage the wire harness clamp until it is locked.

(e) Connect the 2 airbag connectors to the horn button assembly.

NOTICE:

  • When connecting any airbag connector, take care not to damage the airbag wire harness.
  • Be sure to connect the connectors to each corresponding color.

(f) Push in the 2 airbag connector locking buttons as shown in the illustration to install the 2 airbag connectors.

(g) Connect the horn connector to the horn button assembly.

(h) Push the horn button assembly to engage the 3 pins carefully and install the horn button assembly.

NOTICE:

  • Make sure that the pins are securely inserted into the steering wheel assembly holes.
  • Make sure to engage the 2 upper pins first.
  • Make sure that the horn button assembly is securely installed.

2. INSTALL LOWER NO. 2 STEERING WHEEL COVER

(a) Engage each claw to install the 3 lower No. 2 steering wheel covers.

*A

for LH Side

*B

for RH Side

*C

for Under Side

-

-

3. CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL

for Gasoline Model: Click here

for HV Model: Click here

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

4. INSTALL LUGGAGE TRIM SERVICE HOLE COVER (for HV Model)

Click here

5. INSPECT HORN BUTTON ASSEMBLY

(a) Make sure that the horn sounds.

If the horn does not sound, inspect the horn system.

Click here

6. PERFORM DIAGNOSTIC SYSTEM CHECK

for Gasoline Model: Click here

for HV Model: Click here

7. INSPECT SRS WARNING LIGHT

for Gasoline Model: Click here

for HV Model: Click here

On-vehicle Inspection

ON-VEHICLE INSPECTION

CAUTION / NOTICE / HINT

CAUTION:

Be sure to correctly follow the removal and installation procedures for the horn button assembly.

PROCEDURE

1. INSPECT HORN BUTTON ASSEMBLY (for Vehicle not Involved in Collision)

(a) Perform a diagnostic system check.

for Gasoline Model: Click here

for HV Model: Click here

(b) 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.

2. INSPECT HORN BUTTON 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 horn button assembly removed from 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
  • Cracks or other damage to the connector
  • Deformation of the steering wheel assembly
  • Deformation of the installation surface of the horn button assembly
  • Interference or uneven clearance between the horn button assembly and steering wheel assembly when a new horn button assembly is installed to the steering wheel assembly

OK:

No defects are found.

If any defects are found, replace the horn button assembly or steering wheel assembly with a new one.

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 horn button 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

Link

*: When performing learning using the Techstream.

Click here

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

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

Link

*: When performing learning using the Techstream.

Click here

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

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 LUGGAGE TRIM SERVICE HOLE COVER (for HV Model)

Click here

3. DISCONNECT CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

for Gasoline Model: Click here

for HV Model: Click here

CAUTION:

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

NOTICE:

When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

Click here

4. REMOVE LOWER NO. 2 STEERING WHEEL COVER

(a) Using a screwdriver with its tip wrapped with protective tape, disengage each claw to remove the 3 lower No. 2 steering wheel covers.

HINT:

Be careful when disengaging the claws, as the lower No. 2 steering wheel cover may fly off.

*A

for LH Side

*B

for RH Side

*C

for Under Side

-

-

*a

Protective Tape

-

-

5. REMOVE HORN BUTTON ASSEMBLY

CAUTION:

When storing the horn button assembly, keep the airbag deployment side facing upward.

Deployment Side

(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) Using a screwdriver, push in the 3 torsion springs to disengage the 3 pins as shown in the illustration.

*a

Torsion Spring

Push in this Direction

NOTICE:

Lightly hold the horn button assembly so that it does not fall.

HINT:

Insert the screwdriver from the installation holes for the 3 lower No. 2 steering wheel covers.

(d) Pull out the horn button assembly from the steering wheel assembly and hold the horn button assembly with one hand.

NOTICE:

When separating the horn button assembly, do not pull the airbag wire harness.

(e) Disconnect the horn connector from the horn button assembly.

*a

Airbag Connector

*b

Horn Connector

*c

Airbag Connector Locking Button

*d

Protective Tape

*e

Wire Harness Clamp

Release in this Direction

Remove in this Direction

(f) Using a screwdriver with its tip wrapped with protective tape, release the 2 airbag connector locking buttons.

(g) Disconnect the 2 airbag connectors.

NOTICE:

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

(h) Using a screwdriver with its tip wrapped with protective tape, release the lock and remove the wire harness clamp to remove the horn button assembly.

Spiral Cable

Certification Ecu

See More:

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Audio And Visual System(for Hv Model): AV Signal Stoppage (Low Battery Voltage) (B158F). Lost Communication with Meter (B1324). HD Radio Tuner Malfunction (B1551,B158D,B15A0,B15B0,B15B3,B15B7,B15BA,B15F9)
AV Signal Stoppage (Low Battery Voltage) (B158F) DESCRIPTION This DTC is stored when a video or audio signal is interrupted due to auxiliary battery voltage input to the radio and display receiver assembly dropping temporarily. DTC No. Detection Item DTC Detection Condition Trouble Area B158F AV Sig ...

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

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