MMI(R) - Cracking Noises/Audio Drpout/System Inoperative
91 MMI: Sporadic cracking noises, audio dropouts or completely inoperative91 10 56
2015528/8
August 23, 2010
Supersedes Technical Service Bulletin Group 91 number 09-33 dated April 14, 2009 for reasons listed below.
AFFECTED VEHICLES
CONDITION
^ Sporadic cracking noises or audio dropouts in all audio sources.
^ Complete failure of the MMI system - frozen or blank screen.
Tip: Multimedia Control Head E380 is ruled out as the root cause.
TECHNICAL BACKGROUND
A MOST component causes interruptions of the optical data communication. One of the components shown above may be the most likely root cause of this condition.
PRODUCTION SOLUTION
Hardware or software improvements
SERVICE
1. Connect a recommended battery charger to the designated charging posts in the vehicle.
Tip: To avoid false readings of the battery manager, don't charge the battery directly at its posts.
2. Disconnect the optical connection of the CD changer R-41. Install the flat contact housing (MOST loop) 4E0 973 802.
^ If the symptom disappears, replace the CD changer.
^ If the symptom remains, reconnect the optical connection of the CD changer and proceed to step 3.
3. Disconnect the optical connection of the Audi Music Interface (if applicable). Install the flat contact housing (MOST loop) 4E0 973 802.
^ If the symptom disappears, replace the control module.
^ If the symptom still remains, reconnect the optical connection of the Audi Music Interface and proceed to step 4.
4. Disconnect the optical connection of the Telephone transceiver R-36 (if applicable). Install the flat contact housing (MOST loop) 4E0 973 802.
^ If the symptom disappears:
For MY 2007-2008:
1. Replace the control module with part number 4F0 910 336 H or HX and code it to 10900.
2. In the telephone transceiver, ensure that adaption value 133 is set to 1 and adaptation value 134 is set to 0.
3. Perform an MMI Software Update. Only CD#2 is required, since R-36 already has the necessary software with the prior installation of 4F0 910336 H or HX. Refer to Technical Service Bulletin 2019334 for directions to perform the update.
For MY 2009: Replace the control module.
^ If the symptom still remains, reconnect the optical connection of the Telephone transceiver and proceed to step 5.
5. Proceed to individually loop Radio Tuner, Navigation, SDARS Tuner, Amplifier and Gateway. (If you loop Gateway, you must push the on/off button to turn the MMI on.). Remove speech input control module J507 and swap Headunit J523 until the malfunctioning component is identified. If the symptom still remains, open a TAC ticket.
WARRANTY INFORMATION
ADDITIONAL INFORMATION
The following Technical Service Bulletin(s) may be necessary to complete this procedure:
^ TSB 2019334, 91 MMI High System software update (Zug 864 - update) procedure
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.