Audio System - Intermittent Loud Squeal From Speakers
SI B65 01 03Sound System, Cruise, Alarms, Monitors
January 2003
Service Engineering
SUBJECT
Certain Speakers Emit Loud Squeal at Times
MODEL
E65, E66 (7 Series) With Logic7 Amplifier
SITUATION
Customer may complain that occasionally there is a loud squealing noise from both rear door mid-range speakers, both front sub-woofer speakers and the center front speaker.
CAUSE
Faulty Logic7 Amplifier
PROCEDURE
1. Verity customer complaint
2. While noise is occurring remove Fuse F65 (Power supply for Logic7).
3. If noise disappears then replace Logic7 Amplifier and reinstall F65. Refer to SI B09 05 01 (Coding, Individualization and Programming) for any necessary coding and programming. Note that CIP will automatically reprogram all programmable control units that do not have the latest software.