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The "Software Calibration Number" (SCN) is specified by law in Europe and USA for all control units
relevant to exhaust emission as of model year 2002.
Accordingly the software and coding of such a control unit must be clearly identifiable by means of the
SCN. As a number the SCN consists of 16 numbers. The first 10 places correspond to the object number to
be coded (mostly object number of control unit software). The next 2 places designate the manufacturing
plant or field organization, in which the vehicle has been coded. The last 4 places are a number of the
variants of the coding string of the vehicle-specific as-built configuration. This number is serially numbered
for each newly formed variant.
If special equipment has been installed or removed in the vehicle (e.g. retrofitting a telephone), these
retrofit codes must be added to the central system before requesting the SCN coding data. The appropriate
national organization must be contacted (MPC) for this.
MAINTENANCE
BATTERIES - CHECKING AND CORRECTING FLUID LEVEL - AP54.10-P-5410MCC
MODEL 451.3 (except 451.334)
MODEL 451.3 (except 451.380)
MODEL 451.4 (except 451.480)
Fig. 1: Identifying Battery Components
Courtesy of MERCEDES-BENZ OF NORTH AMERICA.
Removing
Risk of explosion caused by
oxyhydrogen gas. Risk of
poisoning and caustic burns
caused by swallowing battery acid.
Risk of injury caused by burns to
No fire, sparks, open
flames or smoking. Wear
acid-resistant gloves,
clothing and glasses. Only
pour battery acid into
AS54.10-Z-0001-01A
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