Horn System: Inspection

INSPECT HORN SWITCH
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: 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 and check that the horn blows.

If the operation is not as specified, replace the horn.

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

INSPECT HORN RELAY CONTINUITY

HORN RELAY CONTINUITY CONDITIONS

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.

Fig 3: Inspecting Horn Relay Continuity

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Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002