Section 545 (Horn System): Inspection

WARNING: This page is about a different car, the 2004 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FUSE (HORN)
1. Check the HORN fuse resistance.
  Resistance: Below 1 Ω
  
  If the result is not as specified, replace the fuse.
  
  Fig 1: Checking Horn Fuse Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HIGH PITCHED HORN ASSY

Check operation of the horn.

Standard:

MEASUREMENT SPECIFIED CONDITION CHART

Measurement Condition	Specified Condition
Battery positive (+) --> Terminal 1 Battery negative (-) --> Horn bracket	Horn sounds

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

Fig 2: Checking High Pitched Horn Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT LOW PITCHED HORN ASSY

Check operation of the horn.

Standard:

MEASUREMENT SPECIFIED CONDITION CHART

Measurement Condition	Specified Condition
Battery positive (+) --> Terminal 1 Battery negative (-) --> Horn bracket	Horn sounds

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

Fig 3: Checking Low Pitched Horn Assy

If all the check results are as specified above and the wire harness is normal, replace the horn button switch (steering wheel pad) (See INSPECTION ).