Information on Door/Speaker Noise Concerns. Chevrolet Corvette 2005

Subject:

Door/Speaker Noise Concerns

Models:

2005 Chevrolet Corvette

It has come to our attention that door speakers are being unnecessarily replaced to correct a door rattle concern.

Prior to replacing any speaker(s), follow the tables below to determine the root cause.

Step	Action	Yes	No
1	Inspect the door trim before removing it. Set the bass control to the maximum level and the volume to the halfway mark. Is the Bose® emblem loose?	Go to Step 2	Go to Step 3
2	Remove the trim and repair or replace it. Does this correct the condition ?	Repair complete	Go to Step 3
3	Does the map pocket vibrate?	Go to Step 4	Go to Step 5
4	Remove the trim and repair or replace it. Does this correct the condition?	Repair complete	Go to Step 5
5	Do the trim attachment points vibrate?	Go to Step 6	Go to Step 7
6	Remove the trim and replace the retaining clips. Does this correct the condition?	Repair complete	Go to Step 7
7	Remove the trim and inspect the rear side of trim for loose parts. Is the impact foam loose?	Go to Step 8	Go to Step 9
8	Remove and repair the foam attachment. Does this correct the condition?	Repair complete	Go to Step 9
9	Do the speaker grille tabs vibrate?	Go to Step 10	Go to Step 11
10	Remove or replace the grille or repair the grille attachments. Does this correct the condition?	Repair complete	Go to Step 11
11	Do the LED wires to the door lock vibrate?	Go to Step 12	Go to Step 13
12	Remove the trim and repair or replace. Does this correct the condition?	Repair complete.	Go to Step 13
13	Do any other parts buzz or rattle?	Go to Step 14	Repair complete
14	Repair the buzz with tape or foam.	Repair complete	Proceed to the next table

Speaker Static

Checks	Actions	Yes	No
Is the static coming from the audio system (AM and/or FM) or the OnStar® system?	Refer to the Service Information for the appropriate diagnostic and correction procedures.	--	--
If static is coming from the radio, it will be heard in the front left and center speaker. If static is coming from the speaker, use a Diagnostic CD, (J 39916-8) to check the speaker.	Insert a known, good quality CD.	--	--
Using service diagnostic CD (J 39916-8), play tracks 4, 5, 6, and 7 for tones and track 14 for Obd sound (quiet track). Set the radio controls to fade and balance to the speaker where the noise is coming from. Set the treble control to max and adjust the volume to hear the noise.	Play tracks 4-7 to determine if the speaker is rubbing or has static. Are harsh sounds coming from a single speaker? Determine if the radio has a hiss. Play track 14 and listen for static at 1st volume step and full volume. A hiss noise will be audible at 1st step, more hiss noise is acceptable at full volume. If hiss is heard in the radio at the first volume click, then inform the customer the system is working to spec. Replace the speaker and verify this fixes the customer's concern. Verify other sources for static noise -- AM, FM, XM, and OnStar®. Refer to the Service Manual for fixing or replacing other modules.	Go to Step 4 Go to Step 3	Go to Step 2 Go to Step 5

Checks

Actions

Yes

Is the static coming from the audio system (AM and/or FM) or the OnStar® system?

Refer to the Service Information for the appropriate diagnostic and correction procedures.

If static is coming from the radio, it will be heard in the front left and center speaker.

If static is coming from the speaker, use a Diagnostic CD, (J 39916-8) to check the speaker.

Insert a known, good quality CD.

Using service diagnostic CD (J 39916-8), play tracks 4, 5, 6, and 7 for tones and track 14 for Obd sound (quiet track). Set the radio controls to fade and balance to the speaker where the noise is coming from. Set the treble control to max and adjust the volume to hear the noise.

Play tracks 4-7 to determine if the speaker is rubbing or has static.

Are harsh sounds coming from a single speaker?

Determine if the radio has a hiss. Play track 14 and listen for static at 1st volume step and full volume. A hiss noise will be audible at 1st step, more hiss noise is acceptable at full volume.
If hiss is heard in the radio at the first volume click, then inform the customer the system is working to spec.
Replace the speaker and verify this fixes the customer's concern.
Verify other sources for static noise -- AM, FM, XM, and OnStar®. Refer to the Service Manual for fixing or replacing other modules.

Go to Step 4

Go to Step 3

Go to Step 2

Go to Step 5

Step	Action	Yes	No
1	Play the speaker while the door trim is off. Does the wire harness on the door or trim vibrate?	Go to Step 2	Go to Step 3
2	Repair the buzz with tape or foam. Does this repair the condition ?	Repair complete	Go to Step 3
3	Is the water deflector loose?	Go to Step 4	Go to Step 5
4	Add adhesive to re-secure the deflector. Does this repair the condition ?	Repair complete	Go to Step 5
5	Are there loose patches sealing holes?	Go to Step 6	Go to Step 7
6	Repair or replace the patches. Does this repair the condition?	Repair complete.	Go to Step 7
7	Check for loose speaker fasteners. Are there any loose fasteners?	Go to Step 8	Go to Step 9
8	Check torque and tighten the fasteners to specification, if necessary. Does this repair the condition ?	Repair complete	Go to Step 9
9	Door speaker rub-through will have a grainy sound. Inspect for this at different volume levels. Is rub-through suspected?	Got to Step 10	Go to Step 11
10	Replace the speaker. Does this repair the condition ?	Repair complete.	Go to Step 11
11	Remove the speaker and play the audio with the speaker in your hand. Is the speaker buzzing?	Go to Step 12	--
12	Replace the speaker.	-	--