LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2001 >> LS 430 >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Systems >> Circuit Tests >> Horn Circuit
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Horn Circuit

NOTE: If LEXUS scan tool is available, start test from step  1. If this scan tool is not available, start test from step  2.
  1. Using scan tool, operate horn in ACTIVE LIST. If horn does not operate, go to next step. If horn operates, go to next test listed in BODY NO. 5 CONTROL SYSTEM  table under TROUBLE SHOOTING .
  2. Check HORN fuse located in engine room junction block. Replace fuse as necessary. If fuse is okay, go to next step.
  3. Ensure ignition is off. Disconnect body No. 5 ECU connector. Measure voltage between connector terminals No. 15 and 25. See PIN VOLTAGE TESTS . If voltage is 10-14 volts, go to next test listed in BODY NO. 5 CONTROL SYSTEM  table under TROUBLE SHOOTING . If voltage is not 10-14 volts, apply battery voltage directly to horn. If horn does not sound, replace horn. If horn sounds, check circuits for faults between horn and body No. 5 ECU. See WIRING DIAGRAMS . Repair or replace as necessary. If circuits are okay,
scientia non olet · About LEMON Manuals