Audio System Speaker Mechanical Diagnostics: Recommendation/Instructions
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Before beginning the diagnosis, determine the operating conditions that are contributing to the condition. Ask the customer the following questions:
- Determine the type of music the customer is listening to i.e. Rock, Country, Rap, Hip-Hop, etc.
- Which source was being used when the condition occurred i.e. FM, AM, CD, USB, Aux.
- When did the condition occur, only in the morning? After sitting in the sun?
- Determine the temperature of the vehicle when the condition occurs. Was is cold outside? Only after the vehicle heated up?
- What area of the vehicle did the noise come from?
- Was there anything else in the vehicle when the condition occurred? Packages? Loose items?
- Check for any audio system related DTCs. If there are any DTC's, follow the appropriate diagnostic procedure.
- Music CDs do not hold tone long enough to diagnose trim rattles. Obtain GM Test CD part number # J39916-CD (SPX, 1-800-345-2233). There may be certain audio frequencies such as bass that can cause buzz or rattle in the interior trim. Most trim rattles are caused by bass frequencies in the range of 50-80 Hz and are found on track 3.
- Insert the GM Test CD and play various tracks corresponding to the type of music the customer was listening to when the condition occurred and verify the condition.
- Hold the volume at a constant level and use the balance and fader controls to isolate the speaker(s) that are experiencing the condition.
- Apply hand pressure to the trim in the area of concern.
- If the sound changes when the trim is depressed or manipulated by hand, then the trim is causing the rattle or buzz.