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Technical Service Bulletin # Mercedes Benz Truck GLK 350 LI82-70_P-042940 Date: 120409

Technical Service Bulletin # Mercedes Benz Truck GLK 350 LI82-70_P-042940 Date: 120409

Cell Phone - Bluetooth(R) Choppy, Echo/Distortion

Blue Tooth Hands-free Telephone Conversation Choppy, Echo/Distortion Detected Especially By The Land-line Caller

Topic number LI82.70-P-042940

Version 1

Design group 82.70 Cellular telephone, voice control system (VCS)

Date 04-09-2012

Validity Model 204 up to chassis A182847 or F171433 with COMAND APS including DVD changer, code 512, or COMAND APS (with Reason for change

Complaint:

If you receive customer reports in the above model vehicles of the Blue Tooth Telephone hands-free conversation Audio quality being choppy,

produces echo on both sides but especially detected by the landline.

Cause:

Maybe due to a Software error in the COMAND Head Unit.

Remedy:

To remedy, please update the COMAND Head Unit software using DAS 02/08 (or later) and SD Telematics Disc PN A204 827 42 59 by following

the procedure below.

Update Procedure:

1. Turn Engine and Electrical Consumers OFF

2. Connect a Battery Charger & Start DAS

3. Proceed to menu: Control units --> Information and communication --> Audio, video navigation and Telematics --> COMAND APS --> ...-->

Control unit adaptations --> control unit programming.

2011 Mercedes Benz Truck GLK 350 (204.956) V6-3.5L (272.991) Page 62

4. Follow the DAS prompts ... insert the SD Telematics CD into the Head Unit slot 1 of the changer and wait until the CD is recognized the

update process will start automatically Do NOT Turn Head Unit OFF during the update process (See figure 1 showing what the COMAND

screen looks like during the normal update process)

5. When process is complete, restart the Optical Ring and go back to: control unit adaptations --> Variant coding --> SCN Coding. Perform a

COMAND SCN Coding

NOTE:

You must perform SCN coding after the update even though the Head Unit is fully operational, otherwise, the update is not complete

Attachments

Symptoms

2011 Mercedes Benz Truck GLK 350 (204.956) V6-3.5L (272.991) Page 63