Horn Button ASSY: Replacement

HINT:

• Installation is in the reverse order of removal.
• There are two types of horn button assy:

One is used with 3-spoke steering wheel assy and the other is used with 4-spoke steering wheel assy.

1. PRECAUTION 
2. DISCONNECT BATTERY NEGATIVE TERMINAL 
   CAUTION: After removing the terminal, wait for at least 90 seconds before starting the operation.
3. REMOVE STEERING WHEEL COVER LOWER NO. 2 
   1. Using a screwdriver, remove the steering wheel cover lower No. 2.
   Fig 1: Removing Steering Wheel Cover Lower No. 2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   Tape up the screwdriver tip before use.

4. REMOVE STEERING WHEEL COVER LOWER NO. 3 
   1. Using a screwdriver, remove the steering wheel cover lower No. 3.

   HINT:

   Tape up the screwdriver tip before use.

5. REMOVE HORN BUTTON ASSY 
   1. Place the front wheels facing straight ahead.
   2. Using a Torx® socket wrench (T30), loosen the 2 Torx® screws until the groove along the screw circumference catches on the screw case.
   3. Pull out the horn button assy from the steering wheel assy and support the horn button assy with one hand as shown in the illustration.
      Fig 2: Pulling Out Horn Button Assy From Steering Wheel Assy

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: When removing the horn button assy, do not pull the airbag wire harness.
   4. Disconnect the horn connector.
   5. Disconnect the connector from the horn button assy.
      NOTE: When handling the airbag connector, take care not to damage the airbag wire harness.
   6. Remove the horn button assy.
6. INSTALL HORN BUTTON ASSY 
   1. Support the horn button assy with one hand as shown in the illustration.
   2. Connect the connector to the horn button assy.
      NOTE: When handling the airbag connector, take care not to damage the airbag wire harness.
   3. Connect the horn connector.
      Fig 3: Supporting Horn Button Assy With One Hand

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Confirm that the circumference groove of the Torx® screw fits in the screw case, and place the horn button assy onto the steering wheel assy.
   5. Using a Torx® socket wrench (T30), tighten the 2 Torx® screws.

   Torque: 8.8 N.m (90 kgf.cm, 78 in.lbf) 

7. CONNECT BATTERY NEGATIVE TERMINAL 
8. INSPECT HORN BUTTON ASSY 
   1. With the horn button assy installed on the vehicle, perform a visual check. If there are any defects as mentioned below, replace the horn button assy with a new one: Cuts, minute cracks or marked discoloration on the horn button assy top surface or in the grooved portion.
   2. Make sure that the horn sounds.
   Fig 4: Inspecting Horn Button Assy
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   HINT:

   If the horn does not sound, inspect the horn system (see INSPECTION ).

9. INSPECT SRS WARNING LIGHT (See step 5 on  DIAGNOSIS SYSTEM  )