Audio System - MMI 3G+(R) Popping Noise Followed By No Audio
PSS 91 MMI sound system "pop" and no audio91 13 80
2032706/2
March 28, 2013
Supersedes Technical Service Bulletin Group 91 number 13-73 dated January 25, 2013 for reasons listed below.
Vehicle Information
Condition
Customer complains of a "popping" noise from the radio followed by 10-15 seconds of no audio. The concern can happen in any audio source.
The following conditions must apply:
^ Vehicle is equipped with MMI 3G or MMI 3G+ infotainment systems.
^ Vehicle is not equipped with Bose or Bang & Olufsen sound systems.
^ An ignition cycle is not required for audio to resume.
Technical Background
The problem originates in the HD radio code, which can create a resetting" within the radio unit. Because the tuner is always active in the background, the problem can occur regardless of the audio source or if the HD radio is on or off. It can also occur at any point that the MMI is on, but not necessarily active. For example, the customer opens a door and the MMI starts up. Even though the system is not on" because the ignition is not active, the tuner is running and can create the effect.
Production Solution
Improved software.
Service
Until the software is available, an interim solution that will deactivate the HD radio tuner and prevent the sound dropout and noise is available to customers. The customer will not be able to listen to HD radio broadcasts. Normal AM/FM radio will function properly and no other systems are affected.
1. Ask the customer if they would like to proceed with the interim solution.
^ If the customer accepts the interim solution, proceed to Section A.
^ If the customer declines the interim solution, proceed to Section B.
Section A: Disable HD Radio
1. Using ODIS in the Control module list, right-click on 56 - Radio, and select Control module OBD (Figure 1).
2. Select Code (Figure 2).
Tip:
This option will not be available until ODIS has completed loading all tasks.
3. Change the coding in byte 2 from HEX 07 to HEX 05. Apply changes (Figure 3).
4. Once coding has been changed, perform a 3-finger reset on the MMI system. When the coding is successful, the HD radio options will no longer show in the Band settings on the MMI.
Tip:
Do not perform a spec/actual comparison at any time. This will reset the value and the procedure will have to be repeated. If a spec/actual is performed, perform Section A of this bulletin again to re-disable HD radio.
5. Provide the customer with the attachment explaining the change. Proceed to Section B to record the P55 entry.
Section B: Record P55 Entry
1. Explain to the customer that a solution is forthcoming and that a final repair is not available. Do not replace any components for this condition since this will not resolve the customer's concern.
2. Create a P55 record in the P55 application via the hyperlink in Accessaudi.com (Figure 4) or Technical Assistance page in Elsa (Figure 5).
Warranty
All warranty claims submitted for payment must be in accordance with the Audi Warranty Policies and Procedures Manual. Claims are subject to review or audit by Audi Warranty.
Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.
Customer Letter