Horn System: Inspection

INSPECT HORN SWITCH
1. Check if no continuity exists between terminal 6 of the connector and body ground.
2. Check if continuity exists between terminal 6 of the connector and body ground when the horn contact plate is pressed against the steering wheel.
  If the continuity is not as specified, repair or replace the steering wheel or wire harness as necessary.
  
  Fig 1: Checking Continuity Exists Between Terminal 6 Of Connector And Body Ground
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT HORN OPERATION
Connect the positive (+) lead from the battery to the terminal and negative (-) lead to the horn body, Check if the horn sounds.

If operation is not as specified, replace the horn.

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

INSPECT HORN RELAY (Marking: HORN) CONTINUITY

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
3 - 5	No continuity
3 - 5	Continuity (When battery voltage is applied to terminals 1 and 2)

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

Fig 3: Inspecting Horn Relay

G02641073

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002