Audio System - Surround Setting Lost
91 MMI Surround setting lost91 09 19
2015136/3
March 25, 2009
Supersedes Technical Service Bulletin Group 91 number 08-106 dated November 11, 2008 for reasons listed below.
Vehicle Information
Condition
The customer complaint is that the DSP BOSE sound setting does not remain on surround fr or surround rear.
Instead, normal is displayed, and the corresponding sound focus is audible.
Technical Background
The unwanted behavior occurs only after a sleep cycle of the MMI system. The sound setting does not change by itself during a driving cycle.
Production Solution
Software improvement.
Service
A MMI System software update has to be performed. Refer to Technical Service Bulletin 2019334 for directions to perform the update.
Warranty
Additional Information
The following Technical Service Bulletin(s) will be necessary to complete this procedure:
- TSB 2019334, 91 MMI High System software update (Zug 864 - update) procedure.
All part and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Dept. and service manuals for the latest information.