Installation [07/2020 - ]: Procedure

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 60 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

3. Engage the wire harness clamp.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Wire Harness Clamp
   *b	Airbag Connector
   *c	Horn Connector

   HINT: 

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

4. 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 [07/2020 - 10/2022] , or refer to HOW TO CONNECT OR DISCONNECT AIRBAG CONNECTOR [10/2022 - ]

5. Connect the horn connector to the horn button assembly.
6. Push the horn button assembly to engage the 3 pins carefully and install the horn button assembly.

   Courtesy 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.

1. Insert the guide and engage the claw to install the lower No. 3 steering wheel cover.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Insert the guide and engage the claw to install the lower No. 2 steering wheel cover.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Refer to PROCEDURE - Step 2

Refer to PROCEDURE - Step 57 [07/2020 - 10/2022] , or refer to PROCEDURE - Step 57 [10/2022 - ]

Refer to PROCEDURE - Step 4

1. Make sure that the horn sounds.

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

   Refer to PROBLEM SYMPTOMS TABLE [07/2020 - ]

Refer to DTC CHECK / CLEAR [07/2020 - ]

Refer to OPERATION CHECK [07/2020 - 12/2021] , or refer to OPERATION CHECK [12/2021 - 10/2022] , or refer to OPERATION CHECK [10/2022 - ]

Refer to WORK PROCEDURE [07/2020 - 10/2022] , or refer to WORK PROCEDURE [10/2022 - ]

HINT: 

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Refer to AUTOMATIC LEARNING CHART [07/2020 - ]