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Installation [12/2019 - 10/2022]: Procedure

  1. INSTALL HORN BUTTON ASSEMBLY 
    1. Check that the ignition switch is off.
    2. Check that the cable is disconnected from the negative (-) auxiliary battery terminal.
      WARNING:

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

    3. When using a new spiral cable sub-assembly:
      1. Engage the wire harness clamp and disconnect the airbag connector as shown in the illustration.
        GTY906895Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Wire Harness Clamp
        *b Airbag Connector
        Remove in this Direction

        HINT: 

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

    4. When reusing a spiral cable sub-assembly or spiral cable with sensor sub-assembly:
      GTY912851Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Airbag Connector
      *b Horn Connector
      *c Wire Harness Clamp
      1. Engage the wire harness clamp.

        HINT: 

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

    5. Connect the 2 airbag connectors to the horn button assembly.
      NOTE:
      • When connecting any airbag connector, take care not to damage the airbag wire harness.
      • Be sure to connect the connectors to each corresponding color.

      HINT: 

      Refer to How to Connect or Disconnect Airbag Connector.

      Refer to HOW TO CONNECT OR DISCONNECT AIRBAG CONNECTOR [12/2019 - 11/2023]

    6. Connect the horn connector to the horn button assembly.
    7. Push the horn button assembly to engage the 3 pins carefully and install the horn button assembly.
      GTY788881Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Upper Pin
      *b Lower Pin
      NOTE:
      • 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. 3 STEERING WHEEL COVER 
    1. Insert the guide and engage the claw to install the lower No. 3 steering wheel cover.
      GTY813797Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSTALL LOWER NO. 2 STEERING WHEEL COVER 
    1. Insert the guide and engage the claw to install the lower No. 2 steering wheel cover.
      GTY813796Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. CONNECT CABLE TO NEGATIVE AUXILIARY BATTERY TERMINAL 

    for 2GR-FKS: Refer to PROCEDURE - Step 2

    for A25A-FXS: Refer to PROCEDURE - Step 2

    NOTE:

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

    Refer to INITIALIZATION [12/2019 - 09/2020] , or refer to INITIALIZATION [09/2020 - 10/2021] , or refer to INITIALIZATION [10/2021 - 10/2022]

  5. INSTALL BATTERY SERVICE HOLE COVER (for HV Model) 

    Refer to PROCEDURE - Step 3

  6. INSPECT HORN BUTTON ASSEMBLY 
    1. Make sure that the horn sounds.

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

      Refer to PROBLEM SYMPTOMS TABLE [12/2019 - 11/2023]

  7. PERFORM DIAGNOSTIC SYSTEM CHECK 

    Refer to DTC CHECK / CLEAR [12/2019 - 11/2023]

  8. INSPECT SRS WARNING LIGHT 

    Refer to OPERATION CHECK [12/2019 - 10/2022]

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