Technical Service Bulletin # LI82-62_P-052224 Date: 120326

Audio System - Interference From One Rear Indoor Speaker

Interference noise from one of the rear indoor speakers

Topic number LI82.62-P-052224

Version 1

Design group82.62 Loudspeakers, amplifiers, antennas

Date 03-26-2012

Validity Model 204 without sound system (code 810) as of production 09/2010 (as of VIN #A448864, #F564974, #L128647, #R163977) Reason for change

Complaint:

Interference noises (scratching noise) from one of the rear indoor speakers (H4/3 or H4/4).

Cause:

Due to tolerances in the door module, the indoor speaker (H4/3 or H4/4) may be riveted to the door module under stress. This stress in the speaker

causes the coil to scrape inside the speaker.

Remedy:

Replace problematic indoor speaker (H4/3 or H4/4). To rule out any other interference factors, remove the part number sticker (see attachment

above) from the door module wiring harness and shim the door control unit with a felt strip.

Note:

2011 Mercedes Benz C 250 (204.052) (CANADA) V6-2.5L (272.921) Page 32

The door speaker is riveted onto the door module from behind.