Horn System: Inspection

INSPECT HORN BUTTON ASSY
1. Check that no continuity exists between terminal 6 of the connector and body ground.
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 the continuity is not as specified, repair or replace the steering wheel or wire harness as necessary.

Fig 1: Inspecting Horn Button Assy
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT HORN REPLAY ASSY
1. Inspect the horn relay (Marking: HORN) continuity.
  
  Fig 2: Horn Relay Continuity Condition Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If the continuity is not as specified, replace the relay.

Fig 3: Checking Relay Continuity
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002