Horn System: Inspection

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: Identifying Horn Button Assy Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the HORN relay from the engine room R/B.
2. Measure the HORN relay resistance.
   Fig 2: Identifying Horn Relay Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Standard: 

If the result is not as specified, replace the relay.