Horn System: Inspection

1. Disconnect the negative (-) terminal from the battery.
2. Remove the left and right covers from the steering wheel.
3. Using a torx socket wrench, loosen the 2 bolts.
4. Pull up the horn pad and place it on the steering column, as shown.

   HINT:

   Do not disconnect the connector from the horn pad.

   Fig 1: Pulling Up Horn Pad

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. Disconnect the connector from the slip ring.
6. Check that there is no continuity between terminal 6 of the connector and body ground.
7. Check that there is continuity between terminal 6 of the connector and body ground when the horn contact plate is pressed against the steering spoke assembly.

   If continuity is not as specified, repair or replace the steering wheel or wire harness as necessary.

8. Install the horn pad in place and using a torx socket wrench, torque the 2 bolts.

   Torque: 6.9 N.m (70 kgf.cm, 61 in.lbf) 

   Fig 2: Checking Continuity Between Terminal 6 Of Connector And Body Ground

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Install the left and right covers.
10. Connect the negative (-) terminal to the battery.

Connect the positive (+) lead from the battery to the terminal and negative (-) lead to the horn body and check that the horn blows.

If operation is not as specified, replace the horn.

Fig 3: Inspecting Horn Operation

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If continuity is not as specified, replace the relay.

Fig 4: Inspecting Horn Relay Continuity

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002