Horn System: Inspection

WARNING: This page is about a different car, the 2004 Lexus RX 330. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT LOW PITCHED HORN ASSY

Check operation of the horn.

HORN SPECIFICATION

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

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

Fig 1: Inspecting Low Pitched Horn Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HIGH PITCHED HORN ASSY

Check operation of the horn.

HORN SPECIFICATION

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

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

Fig 2: Inspecting High Pitched Horn Assy

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT HORN RELAY ASSY

Remove the horn relay from the engine room R/B No. 2.
Inspect the horn relay resistance.

Standard:

TESTER SPECIFICATION

Tester Connection	Specified Condition
3 - 5	10 kΩ or higher
3 - 5	Below 1 Ω (When battery voltage is applied to terminals 1 and 2)

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

Fig 3: Inspecting Horn Relay Assy