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Technical Service Bulletin # Mercedes Benz Truck GL 550 S-54_21-234A Date: 101026

Technical Service Bulletin # Mercedes Benz Truck GL 550 S-54_21-234A Date: 101026

Electrical - Aftermarket Tampering Malfunctions

Date: October 26, 2010

Order No.: S-B-54.21/234a

Supersedes: S-B-54.21/234, dated July 27, 2010

Group: 54

Revision History

Revision Date Purpose

a 10/22/10 Additional devices and pictures added.

- 7/27/10 Initial issue

SUBJECT: MY- All, Models All

Malfunctions Due to Other-Make Installations

Recent attempts manipulating vehicle mileage through the use of third party electronic devices installed on Mercedes-Benz vehicles are being

reported.

There are several CAN manipulation devices on the market. Be particularly aware of two devices which are installed in tandem with the instrument

cluster or the EIS (Figure 1) and a circuit board which can be installed directly within the EIS (Figure 2).

2011 Mercedes Benz Truck GL 550 (164.886) V8-5.5L (273.963) Page 123

If vehicle electronics malfunction, control units display implausible mileage readings, or malfunctions lack corresponding default entries; check the

vehicle for non-factory hardware. These are often installed in the interior wiring harness of the vehicle. Another example would be the TV enable

module for the COMAND APS NTG2 in Figure 3.

Possible malfunctions are:

^ Random unlocking or locking of the vehicle while driving

^ Temporary or continuous hazard warning system activation

^ Sudden mileage increase in the IC

If there is evidence that the vehicle has been tampered with (mileage altering device, aftermarket installation etc) please provide as much supporting

documents (pictures, test results, etc.) and send an email with the supporting documents to the Warranty Services Group and request that the vehicle

be put on warranty status.

Warranty will determine the correct status to be applied (usually status 8 which requires AOM review before any repairs are performed), file the

supporting documentation and add notes into our vehicle master system.

Any vehicle with a warranty status will have an alert box pop up when VMI is run to inform the dealer of this status.

Any malfunctions or subsequent damage to other parts due to the installation of foreign parts are not covered by Warranty. The repair costs should

be charged to the customer.