Horn System: Inspection

Inspect horn switch .
1. Check that no continuity exists between terminal 6 of the connector and body ground.
  
  Fig 1: Inspecting Horn Switch
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check that continuity exists 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.
Inspection Horn Operation
Connect the positive (+) lead from the battery to the terminal and negative (-) lead to the horn body and check that the horn blows.

Fig 2: Testing Horn
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace the horn.
Inspect horn relay (Marking: HORN) continuity .

Fig 3: Identifying Horn Relay Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 4: Displaying Horn Relay Specifications
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the relay.