Preliminary Horn System Checks

Before performing any tests, check the following items to eliminate common problems:

• On vehicles equipped with Content Theft Deterrent (CTD), perform horns diagnostic system check before using symptom tables to verify that there are not DTCs present. See HORNS DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
• Check all fuses.
• Check for damaged, loose or corroded connections.
• Check for damaged wiring harness.
• If horn buzzes or has a harsh tone, inspect for debris in joint where horn fastens to vehicle and torque horn mounting hardware. See TORQUE SPECIFICATIONS .
• Check for proper installation of aftermarket electronic equipment which may affect circuits. If a fuse is blown, repair circuits as necessary. Correct any obvious problems before continuing testing. If problem still exists, perform self-diagnostics. See SELF-DIAGNOSTIC SYSTEM .