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Wiring & Pinouts guides and mods

450 OBD Pin Out

The wiring connections to and from the OBD (Data Link Connector).

Modification Details




OBD Socket Location

600cc smart - on the visible side of the fuse box under the dashboard.
700cc smart - in the cubby hole nearest the door on the driver's side.

The 700cc 450 has a flap down cover that protects the socket.

700cc Smart Fortwo

The table below shows the connections to and from the OBD.
It shows that each controller has its own diagnostics line which is used by
the Mercedes Star Machine or the 3rd party Win-star system.



Pin 1
SAM unit connection 9, pin 3. Diagnostics
Pin 2
No connection
Pin 3
ECU pin 102. TNA
Pin 4
Negative earth
Pin 5
Negative earth
Pin 6
No connection
Pin 7
ECU pin 110. K-line, Diagnostics
Pin 8
Switched live, fuse 20
Pin 9
ESP unit pin 11. Diagnostics
Pin 10
No connection
Pin 11
Steering assist unit, connection B, pin 2. Diagnostics
Pin 12
Restraint systems/Airbag controller pin 9. Diagnostics
Pin 13
No connection
Pin 14
No connection
Pin 15
No connection
Pin 16
Permanent live, fuse 11

So you'll notice that although there is a standard K-line connection for diagnostics, there are separate
connections to the SAM, ECU, Steering assist unit ESP controller and the Airbag controller. These will be
what the smart diagnostics machine (MB Star) will communicate through instead of going via the K-line.

The G1 smart uses ISO 14230-4 to transmit data to the OBD.

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