Horn System: Inspection

Inspect Horn Switch
1. Check that no continuity exists between terminal 6 of the connector and body ground.
  
  Fig 1: Checking Continuity Between Connector Terminal 6 & Body Ground
  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 the continuity is not as specified, repair or replace the steering wheel or wire harness as necessary.
Inspect 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 the operation is not as specified, replace the horn.

Inspect Horn Relay Continuity

Fig 3: Identifying Horn Relay Terminals

G02911894

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Horn Relay Specifications

Condition	Tester connection	Specified condition
Constant	1 - 2	Continuity
Apply B+ between terminals 1 and 2	3 - 5	Continuity

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