Visual Inspection and Diagnostic Pre-checks

Normal Operation and Fault Conditions

The ACM sends audio signals to the speakers in the form of AC voltage, resulting in clear audio output.

Possible Sources

Loose component fasteners Loose door handle, lock, and other trim panel components and fasteners Loose items in storage areas Loose speaker grilles Loose wire harnesses or wire harness fasteners Speaker(s) Water shield bonding and placement

Visual Inspection and Diagnostic Pre-checks

Visually inspect around the suspect area for any possible rattle conditions such as:

Any storage compartments including cup holders (if equipped) Door map pockets for contents that can rattle (if equipped) Door pull cup attachments (if equipped) Door switch bezels (if equipped) Package tray (if equipped) Speaker grilles Trim panels and fasteners

PINPOINT TEST H : POOR SOUND QUALITY OR DISTORTED SOUND FROM ONE OR MORE

SPEAKERS (NOT ALL SPEAKERS)

H1 ISOLATE THE ZONE

Operate the audio system using digital media such as a CD or MP3. Using the audio system fade and balance feature, adjust the audio sound to each of the four zones (LHF, RHF, LHR and RHR) of the vehicle to isolate the poor sound quality. Locate and apply pressure to the trim panel(s) around the poor sound quality area in question.

Does applying pressure to a trim panel reduce or eliminate the audible noise?

H2 REMOVE AND INSPECT BEHIND/UNDERNEATH THE SUSPECT TRIM PANEL(S)

Remove the trim panel to access the suspect speaker. Operate the audio system using digital media such as a CD or MP3. Validate where the poor sound quality area is located. Check:

Trim panel for loose components around the speaker area such as the speaker grille Trim panel joining components for missing or broken pieces Lock and handle mechanical parts for correct attachment Wire harnesses for correct routing Wire harness fasteners for correct attachment Water shield for correct placement (speaker air path not blocked) Water shield for correct bonding to sheet metal Storage areas for loose items All child safety belt anchors (if equipped) All safety belt retractors All speaker bracket fasteners and other fasteners are secured and tightened to specified torque

Was the source of the noise located?