Audio System - BOSE AudioPilot(R) Volume Fluctuates
91 BOSE AudioPilot volume fluctuates unnaturally91 13 71
2029197/4
January 24, 2013.
Supersedes Technical Service Bulletin Group 91 number 12-67 dated November 6, 2012 for reasons listed below.
VEHICLE INFORMATION
CONDITION
Customer states volume fluctuates unnaturally. This may be described as:
^ Significant increases in Bass or Treble levels shortly after startup, in conjunction with Park Aid, or during normal driving.
^ Fluctuations in background "hissing" during a phone call.
Only applies to vehicles equipped with BOSE sound system (PR No. 8RY)
TECHNICAL BACKGROUND
Vehicles with a BOSE sound system in conjunction with AudioPilot are equipped with dynamic driving noise compensation. It adjusts playback volume and/or equalization depending on noise inside the vehicle. This function is perceived as a flat increase in volume as the cabin noise increases, usually due to increases in speed. In some vehicles, issues with the vehicle microphones may cause the volume to noticeably change at times when it is not necessary, such as in a parking lot, or when backing out of a driveway.
PRODUCTION SOLUTION
New microphones.
SERVICE
1. Replace the microphones in the dome light assembly with the revised part number.
WARRANTY
REQUIRED PARTS AND TOOLS
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.