Horn System: Inspection

1. Measure the resistance of the fuse.

   Standard: Below 1 & ohm 

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

Fig 1: Measuring Resistance Of Fuse

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the HORN relay from the engine room R/B.
2. Measure the resistance of the relay.
   Fig 2: Measuring Resistance Of Relay

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard: 

   RELAY RESISTANCE SPECIFICATION
   
   

   Tester Connection	Specified Condition
   3-5	10 & ohm or higher
   3-5	Below 1 & ohm (when battery voltage is applied to terminals 1 and 2)

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

1. Apply battery voltage to the horn and check operation of the horn.

   OK:

   Fig 3: Horn Operation Specified Conditions

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   If the result is not as specified, replace the horn assy.

If all the check results are as specified above and the wire harness is normal but the horn does not sound, replace the horn button switch (steering wheel pad) (see REPLACEMENT ).

Fig 4: Inspecting Low Pitched Horn Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002