Mercedes-Benz 949 Series Introduction Into Service Manual page 33

Electrical system
Electronics compartment
Fuses, relays and control units are located in the
electronics compartment under the dashboard on
the passenger side.
Engine control (MR) control unit
The engine control (MR) control unit is located on
the left of the engine.
On-Board Diagnosis (OBD)
The standardized diagnostic socket for on-board
diagnosis is located on the right next to the steering
column.
32 The New Zetros, Introduction into Service Manual for Model Series 949
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Electronics compartment
A6 Engine control (MR) control unit
X13 Diagnostic socket
W54.20-1003-00
W54.21-1375-00
W54.22-1008-00